verilog/rtl/caravel.v

// `default_nettype none
// SPDX-FileCopyrightText: 2020 Efabless Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// SPDX-License-Identifier: Apache-2.0
/*--------------------------------------------------------------*/
/* caravel, a project harness for the Google/SkyWater sky130	*/
/* fabrication process and open source PDK			*/
/*                                                          	*/
/* Copyright 2020 efabless, Inc.                            	*/
/* Written by Tim Edwards, December 2019                    	*/
/* and Mohamed Shalan, August 2020			    	*/
/* This file is open source hardware released under the     	*/
/* Apache 2.0 license.  See file LICENSE.                   	*/
/*                                                          	*/
/*--------------------------------------------------------------*/

module caravel (
    inout vddio,	// Common 3.3V padframe/ESD power
    inout vddio_2,	// Common 3.3V padframe/ESD power
    inout vssio,	// Common padframe/ESD ground
    inout vssio_2,	// Common padframe/ESD ground
    inout vdda,		// Management 3.3V power
    inout vssa,		// Common analog ground
    inout vccd,		// Management/Common 1.8V power
    inout vssd,		// Common digital ground
    inout vdda1,	// User area 1 3.3V power
    inout vdda1_2,	// User area 1 3.3V power
    inout vdda2,	// User area 2 3.3V power
    inout vssa1,	// User area 1 analog ground
	inout vssa1_2,  // User area 1 analog ground
    inout vssa2,	// User area 2 analog ground
    inout vccd1,	// User area 1 1.8V power
    inout vccd2,	// User area 2 1.8V power
    inout vssd1,	// User area 1 digital ground
    inout vssd2,	// User area 2 digital ground

    inout gpio,			// Used for external LDO control
    inout [`MPRJ_IO_PADS-1:0] mprj_io,
    output [`MPRJ_PWR_PADS-1:0] pwr_ctrl_out,
    input clock,	    	// CMOS core clock input, not a crystal
    input resetb,

    // Note that only two pins are available on the flash so dual and
    // quad flash modes are not available.

    output flash_csb,
    output flash_clk,
    output flash_io0,
    output flash_io1
);

    //------------------------------------------------------------
    // This value is uniquely defined for each user project.
    //------------------------------------------------------------
    parameter USER_PROJECT_ID = 32'h0002001b;

    // These pins are overlaid on mprj_io space.  They have the function
    // below when the management processor is in reset, or in the default
    // configuration.  They are assigned to uses in the user space by the
    // configuration program running off of the SPI flash.  Note that even
    // when the user has taken control of these pins, they can be restored
    // to the original use by setting the resetb pin low.  The SPI pins and
    // UART pins can be connected directly to an FTDI chip as long as the
    // FTDI chip sets these lines to high impedence (input function) at
    // all times except when holding the chip in reset.

    // JTAG      = mprj_io[0]		(inout)
    // SDO 	 = mprj_io[1]		(output)
    // SDI 	 = mprj_io[2]		(input)
    // CSB 	 = mprj_io[3]		(input)
    // SCK	 = mprj_io[4]		(input)
    // ser_rx    = mprj_io[5]		(input)
    // ser_tx    = mprj_io[6]		(output)
    // irq 	 = mprj_io[7]		(input)

    // These pins are reserved for any project that wants to incorporate
    // its own processor and flash controller.  While a user project can
    // technically use any available I/O pins for the purpose, these
    // four pins connect to a pass-through mode from the SPI slave (pins
    // 1-4 above) so that any SPI flash connected to these specific pins
    // can be accessed through the SPI slave even when the processor is in
    // reset.

    // user_flash_csb = mprj_io[8]
    // user_flash_sck = mprj_io[9]
    // user_flash_io0 = mprj_io[10]
    // user_flash_io1 = mprj_io[11]

    // One-bit GPIO dedicated to management SoC (outside of user control)
    wire gpio_out_core;
    wire gpio_in_core;
    wire gpio_mode0_core;
    wire gpio_mode1_core;
    wire gpio_outenb_core;
    wire gpio_inenb_core;

    // User Project Control (pad-facing)
    wire [`MPRJ_IO_PADS-1:0] mprj_io_inp_dis;
    wire [`MPRJ_IO_PADS-1:0] mprj_io_oeb;
    wire [`MPRJ_IO_PADS-1:0] mprj_io_ib_mode_sel;
    wire [`MPRJ_IO_PADS-1:0] mprj_io_vtrip_sel;
    wire [`MPRJ_IO_PADS-1:0] mprj_io_slow_sel;
    wire [`MPRJ_IO_PADS-1:0] mprj_io_holdover;
    wire [`MPRJ_IO_PADS-1:0] mprj_io_analog_en;
    wire [`MPRJ_IO_PADS-1:0] mprj_io_analog_sel;
    wire [`MPRJ_IO_PADS-1:0] mprj_io_analog_pol;
    wire [`MPRJ_IO_PADS*3-1:0] mprj_io_dm;
    wire [`MPRJ_IO_PADS-1:0] mprj_io_in;
    wire [`MPRJ_IO_PADS-1:0] mprj_io_out;

    // User Project Control (user-facing)
    wire [`MPRJ_IO_PADS-1:0] user_io_oeb;
    wire [`MPRJ_IO_PADS-1:0] user_io_in;
    wire [`MPRJ_IO_PADS-1:0] user_io_out;
    wire [`MPRJ_IO_PADS-10:0] user_analog_io;

    /* Padframe control signals */
    wire [`MPRJ_IO_PADS_1-1:0] gpio_serial_link_1;
    wire [`MPRJ_IO_PADS_2-1:0] gpio_serial_link_2;
    wire mprj_io_loader_resetn;
    wire mprj_io_loader_clock;
    wire mprj_io_loader_data_1;		/* user1 side serial loader */
    wire mprj_io_loader_data_2;		/* user2 side serial loader */

    // User Project Control management I/O
    // There are two types of GPIO connections:
    // (1) Full Bidirectional: Management connects to in, out, and oeb
    //     Uses:  JTAG and SDO
    // (2) Selectable bidirectional:  Management connects to in and out,
    //	   which are tied together.  oeb is grounded (oeb from the
    //	   configuration is used)

    // SDI 	 = mprj_io[2]		(input)
    // CSB 	 = mprj_io[3]		(input)
    // SCK	 = mprj_io[4]		(input)
    // ser_rx    = mprj_io[5]		(input)
    // ser_tx    = mprj_io[6]		(output)
    // irq 	 = mprj_io[7]		(input)

    wire [`MPRJ_IO_PADS-1:0] mgmt_io_in;
    wire jtag_out, sdo_out;
    wire jtag_outenb, sdo_outenb;
    wire gpio_flash_io2_out, gpio_flash_io3_out;

    wire [1:0] mgmt_io_nc;			/* no-connects */

    wire clock_core;

    // Power-on-reset signal.  The reset pad generates the sense-inverted
    // reset at 3.3V.  The 1.8V signal and the inverted 1.8V signal are
    // derived.

    wire porb_h;
    wire porb_l;
    wire por_l;

    wire rstb_h;
    wire rstb_l;

    wire flash_clk_core,     flash_csb_core;
    wire flash_clk_oeb_core, flash_csb_oeb_core;
    wire flash_clk_ieb_core, flash_csb_ieb_core;
    wire flash_io0_oeb_core, flash_io1_oeb_core;
    wire flash_io2_oeb_core, flash_io3_oeb_core;
    wire flash_io0_ieb_core, flash_io1_ieb_core;
    wire flash_io0_do_core,  flash_io1_do_core;
    wire flash_io0_di_core,  flash_io1_di_core;

    chip_io padframe(
	`ifndef TOP_ROUTING
		// Package Pins
		.vddio_pad	(vddio),		// Common padframe/ESD supply
		.vddio_pad2	(vddio_2),
		.vssio_pad	(vssio),		// Common padframe/ESD ground
		.vssio_pad2	(vssio_2),
		.vccd_pad	(vccd),			// Common 1.8V supply
		.vssd_pad	(vssd),			// Common digital ground
		.vdda_pad	(vdda),			// Management analog 3.3V supply
		.vssa_pad	(vssa),			// Management analog ground
		.vdda1_pad	(vdda1),		// User area 1 3.3V supply
		.vdda1_pad2	(vdda1_2),		
		.vdda2_pad	(vdda2),		// User area 2 3.3V supply
		.vssa1_pad	(vssa1),		// User area 1 analog ground
		.vssa1_pad2	(vssa1_2),
		.vssa2_pad	(vssa2),		// User area 2 analog ground
		.vccd1_pad	(vccd1),		// User area 1 1.8V supply
		.vccd2_pad	(vccd2),		// User area 2 1.8V supply
		.vssd1_pad	(vssd1),		// User area 1 digital ground
		.vssd2_pad	(vssd2),		// User area 2 digital ground
	`endif
	// Core Side Pins
	.vddio	(vddio_core),
	.vssio	(vssio_core),
	.vdda	(vdda_core),
	.vssa	(vssa_core),
	.vccd	(vccd_core),
	.vssd	(vssd_core),
	.vdda1	(vdda1_core),
	.vdda2	(vdda2_core),
	.vssa1	(vssa1_core),
	.vssa2	(vssa2_core),
	.vccd1	(vccd1_core),
	.vccd2	(vccd2_core),
	.vssd1	(vssd1_core),
	.vssd2	(vssd2_core),

	.gpio(gpio),
	.mprj_io(mprj_io),
	.clock(clock),
	.resetb(resetb),
	.flash_csb(flash_csb),
	.flash_clk(flash_clk),
	.flash_io0(flash_io0),
	.flash_io1(flash_io1),
	// SoC Core Interface
	.porb_h(porb_h),
	.por(por_l),
	.resetb_core_h(rstb_h),
	.clock_core(clock_core),
	.gpio_out_core(gpio_out_core),
	.gpio_in_core(gpio_in_core),
	.gpio_mode0_core(gpio_mode0_core),
	.gpio_mode1_core(gpio_mode1_core),
	.gpio_outenb_core(gpio_outenb_core),
	.gpio_inenb_core(gpio_inenb_core),
	.flash_csb_core(flash_csb_core),
	.flash_clk_core(flash_clk_core),
	.flash_csb_oeb_core(flash_csb_oeb_core),
	.flash_clk_oeb_core(flash_clk_oeb_core),
	.flash_io0_oeb_core(flash_io0_oeb_core),
	.flash_io1_oeb_core(flash_io1_oeb_core),
	.flash_csb_ieb_core(flash_csb_ieb_core),
	.flash_clk_ieb_core(flash_clk_ieb_core),
	.flash_io0_ieb_core(flash_io0_ieb_core),
	.flash_io1_ieb_core(flash_io1_ieb_core),
	.flash_io0_do_core(flash_io0_do_core),
	.flash_io1_do_core(flash_io1_do_core),
	.flash_io0_di_core(flash_io0_di_core),
	.flash_io1_di_core(flash_io1_di_core),
	.mprj_io_in(mprj_io_in),
	.mprj_io_out(mprj_io_out),
	.mprj_io_oeb(mprj_io_oeb),
	.mprj_io_inp_dis(mprj_io_inp_dis),
	.mprj_io_ib_mode_sel(mprj_io_ib_mode_sel),
	.mprj_io_vtrip_sel(mprj_io_vtrip_sel),
	.mprj_io_slow_sel(mprj_io_slow_sel),
	.mprj_io_holdover(mprj_io_holdover),
	.mprj_io_analog_en(mprj_io_analog_en),
	.mprj_io_analog_sel(mprj_io_analog_sel),
	.mprj_io_analog_pol(mprj_io_analog_pol),
	.mprj_io_dm(mprj_io_dm),
	.mprj_analog_io(user_analog_io)
    );

    // SoC core
    wire caravel_clk;
    wire caravel_clk2;
    wire caravel_rstn;

    wire [7:0] spi_ro_config_core;

    // LA signals
    wire [127:0] la_data_in_user;  // From CPU to MPRJ
    wire [127:0] la_data_in_mprj;  // From MPRJ to CPU
    wire [127:0] la_data_out_mprj; // From CPU to MPRJ
    wire [127:0] la_data_out_user; // From MPRJ to CPU
    wire [127:0] la_oenb_user;     // From CPU to MPRJ
    wire [127:0] la_oenb_mprj;	   // From CPU to MPRJ
    wire [127:0] la_iena_mprj;	   // From CPU only
    wire [2:0]   user_irq;	   // From MRPJ to CPU
    wire [2:0]   user_irq_core;
    wire [2:0]   user_irq_ena;

    // WB MI A (User Project)
    wire mprj_cyc_o_core;
    wire mprj_stb_o_core;
    wire mprj_we_o_core;
    wire [3:0] mprj_sel_o_core;
    wire [31:0] mprj_adr_o_core;
    wire [31:0] mprj_dat_o_core;
    wire mprj_ack_i_core;
    wire [31:0] mprj_dat_i_core;

    // WB MI B (xbar)
    wire xbar_cyc_o_core;
    wire xbar_stb_o_core;
    wire xbar_we_o_core;
    wire [3:0] xbar_sel_o_core;
    wire [31:0] xbar_adr_o_core;
    wire [31:0] xbar_dat_o_core;
    wire xbar_ack_i_core;
    wire [31:0] xbar_dat_i_core;

    // Mask revision
    wire [31:0] mask_rev;

	wire 	    mprj_clock;
	wire 	    mprj_clock2;
	wire 	    mprj_reset;
	wire 	    mprj_cyc_o_user;
	wire 	    mprj_stb_o_user;
	wire 	    mprj_we_o_user;
	wire [3:0]  mprj_sel_o_user;
	wire [31:0] mprj_adr_o_user;
	wire [31:0] mprj_dat_o_user;
	wire	    mprj_vcc_pwrgood;
	wire	    mprj2_vcc_pwrgood;
	wire	    mprj_vdd_pwrgood;
	wire	    mprj2_vdd_pwrgood;

	// Storage area
	// Management R/W interface
	wire [`RAM_BLOCKS-1:0] mgmt_ena;
    wire [`RAM_BLOCKS-1:0] mgmt_wen;
    wire [(`RAM_BLOCKS*4)-1:0] mgmt_wen_mask;
    wire [7:0] mgmt_addr;
    wire [31:0] mgmt_wdata;
    wire [(`RAM_BLOCKS*32)-1:0] mgmt_rdata;
	// Management RO interface
	wire mgmt_ena_ro;
    wire [7:0] mgmt_addr_ro;
    wire [31:0] mgmt_rdata_ro;

    mgmt_core soc (
	`ifdef USE_POWER_PINS
		.VPWR(vccd_core),
		.VGND(vssd_core),
	`endif
		// GPIO (1 pin)
		.gpio_out_pad(gpio_out_core),
		.gpio_in_pad(gpio_in_core),
		.gpio_mode0_pad(gpio_mode0_core),
		.gpio_mode1_pad(gpio_mode1_core),
		.gpio_outenb_pad(gpio_outenb_core),
		.gpio_inenb_pad(gpio_inenb_core),
		// Primary SPI flash controller
		.flash_csb(flash_csb_core),
		.flash_clk(flash_clk_core),
		.flash_csb_oeb(flash_csb_oeb_core),
		.flash_clk_oeb(flash_clk_oeb_core),
		.flash_io0_oeb(flash_io0_oeb_core),
		.flash_io1_oeb(flash_io1_oeb_core),
		.flash_csb_ieb(flash_csb_ieb_core),
		.flash_clk_ieb(flash_clk_ieb_core),
		.flash_io0_ieb(flash_io0_ieb_core),
		.flash_io1_ieb(flash_io1_ieb_core),
		.flash_io0_do(flash_io0_do_core),
		.flash_io1_do(flash_io1_do_core),
		.flash_io0_di(flash_io0_di_core),
		.flash_io1_di(flash_io1_di_core),
		// Master Reset
		.resetb(rstb_l),
		.porb(porb_l),
		// Clocks and reset
		.clock(clock_core),
		.core_clk(caravel_clk),
		.user_clk(caravel_clk2),
		.core_rstn(caravel_rstn),
		// IRQ
		.user_irq(user_irq),
		.user_irq_ena(user_irq_ena),
		// Logic Analyzer
		.la_input(la_data_in_mprj),
		.la_output(la_data_out_mprj),
		.la_oenb(la_oenb_mprj),
		.la_iena(la_iena_mprj),
		// User Project IO Control
		.mprj_vcc_pwrgood(mprj_vcc_pwrgood),
		.mprj2_vcc_pwrgood(mprj2_vcc_pwrgood),
		.mprj_vdd_pwrgood(mprj_vdd_pwrgood),
		.mprj2_vdd_pwrgood(mprj2_vdd_pwrgood),
		.mprj_io_loader_resetn(mprj_io_loader_resetn),
		.mprj_io_loader_clock(mprj_io_loader_clock),
		.mprj_io_loader_data_1(mprj_io_loader_data_1),
		.mprj_io_loader_data_2(mprj_io_loader_data_2),
		.mgmt_in_data(mgmt_io_in),
		.mgmt_out_data({gpio_flash_io3_out, gpio_flash_io2_out,
				mgmt_io_in[(`MPRJ_IO_PADS-3):2], mgmt_io_nc}),
		.pwr_ctrl_out(pwr_ctrl_out),
		.sdo_out(sdo_out),
		.sdo_outenb(sdo_outenb),
		.jtag_out(jtag_out),
		.jtag_outenb(jtag_outenb),
		.flash_io2_oeb(flash_io2_oeb_core),
		.flash_io3_oeb(flash_io3_oeb_core),
		// User Project Slave ports (WB MI A)
		.mprj_cyc_o(mprj_cyc_o_core),
		.mprj_stb_o(mprj_stb_o_core),
		.mprj_we_o(mprj_we_o_core),
		.mprj_sel_o(mprj_sel_o_core),
		.mprj_adr_o(mprj_adr_o_core),
		.mprj_dat_o(mprj_dat_o_core),
		.mprj_ack_i(mprj_ack_i_core),
		.mprj_dat_i(mprj_dat_i_core),
		// mask data
		.mask_rev(mask_rev),
		// MGMT area R/W interface
		.mgmt_ena(mgmt_ena),
		.mgmt_wen_mask(mgmt_wen_mask),
		.mgmt_wen(mgmt_wen),
		.mgmt_addr(mgmt_addr),
		.mgmt_wdata(mgmt_wdata),
		.mgmt_rdata(mgmt_rdata),
		// MGMT area RO interface
		.mgmt_ena_ro(mgmt_ena_ro),
		.mgmt_addr_ro(mgmt_addr_ro),
		.mgmt_rdata_ro(mgmt_rdata_ro)
    	);

	/* Clock and reset to user space are passed through a tristate	*/
	/* buffer like the above, but since they are intended to be	*/
	/* always active, connect the enable to the logic-1 output from	*/
	/* the vccd1 domain.						*/

	mgmt_protect mgmt_buffers (
	`ifdef USE_POWER_PINS
		.vccd(vccd_core),
		.vssd(vssd_core),
		.vccd1(vccd1_core),
		.vssd1(vssd1_core),
		.vccd2(vccd2_core),
		.vssd2(vssd2_core),
		.vdda1(vdda1_core),
		.vssa1(vssa1_core),
		.vdda2(vdda2_core),
		.vssa2(vssa2_core),
    `endif
		.caravel_clk(caravel_clk),
		.caravel_clk2(caravel_clk2),
		.caravel_rstn(caravel_rstn),
		.mprj_cyc_o_core(mprj_cyc_o_core),
		.mprj_stb_o_core(mprj_stb_o_core),
		.mprj_we_o_core(mprj_we_o_core),
		.mprj_sel_o_core(mprj_sel_o_core),
		.mprj_adr_o_core(mprj_adr_o_core),
		.mprj_dat_o_core(mprj_dat_o_core),
		.user_irq_core(user_irq_core),
		.la_data_out_core(la_data_out_user),
		.la_data_out_mprj(la_data_out_mprj),
		.la_data_in_core(la_data_in_user),
		.la_data_in_mprj(la_data_in_mprj),
		.la_oenb_mprj(la_oenb_mprj),
		.la_oenb_core(la_oenb_user),
		.la_iena_mprj(la_iena_mprj),
		.user_irq_ena(user_irq_ena),

		.user_clock(mprj_clock),
		.user_clock2(mprj_clock2),
		.user_reset(mprj_reset),
		.mprj_cyc_o_user(mprj_cyc_o_user),
		.mprj_stb_o_user(mprj_stb_o_user),
		.mprj_we_o_user(mprj_we_o_user),
		.mprj_sel_o_user(mprj_sel_o_user),
		.mprj_adr_o_user(mprj_adr_o_user),
		.mprj_dat_o_user(mprj_dat_o_user),
		.user_irq(user_irq),
		.user1_vcc_powergood(mprj_vcc_pwrgood),
		.user2_vcc_powergood(mprj2_vcc_pwrgood),
		.user1_vdd_powergood(mprj_vdd_pwrgood),
		.user2_vdd_powergood(mprj2_vdd_pwrgood)
	);


	/*----------------------------------------------*/
	/* Wrapper module around the user project 	*/
	/*----------------------------------------------*/

	user_project_wrapper mprj ( 
	`ifdef USE_POWER_PINS
		.vdda1(vdda1_core),		// User area 1 3.3V power
		.vdda2(vdda2_core),		// User area 2 3.3V power
		.vssa1(vssa1_core),		// User area 1 analog ground
		.vssa2(vssa2_core),		// User area 2 analog ground
		.vccd1(vccd1_core),		// User area 1 1.8V power
		.vccd2(vccd2_core),		// User area 2 1.8V power
		.vssd1(vssd1_core),		// User area 1 digital ground
		.vssd2(vssd2_core),		// User area 2 digital ground
    `endif

    		.wb_clk_i(mprj_clock),
    		.wb_rst_i(mprj_reset),
		// MGMT SoC Wishbone Slave
		.wbs_cyc_i(mprj_cyc_o_user),
		.wbs_stb_i(mprj_stb_o_user),
		.wbs_we_i(mprj_we_o_user),
		.wbs_sel_i(mprj_sel_o_user),
	    	.wbs_adr_i(mprj_adr_o_user),
		.wbs_dat_i(mprj_dat_o_user),
	    	.wbs_ack_o(mprj_ack_i_core),
		.wbs_dat_o(mprj_dat_i_core),
		// Logic Analyzer
		.la_data_in(la_data_in_user),
		.la_data_out(la_data_out_user),
		.la_oenb(la_oenb_user),
		// IO Pads
		.io_in (user_io_in),
    		.io_out(user_io_out),
    		.io_oeb(user_io_oeb),
		.analog_io(user_analog_io),
		// Independent clock
		.user_clock2(mprj_clock2),
		// IRQ
		.user_irq(user_irq_core)
	);

	/*--------------------------------------*/
	/* End user project instantiation	*/
	/*--------------------------------------*/

    wire [`MPRJ_IO_PADS_1-1:0] gpio_serial_link_1_shifted;
    wire [`MPRJ_IO_PADS_2-1:0] gpio_serial_link_2_shifted;

    assign gpio_serial_link_1_shifted = {gpio_serial_link_1[`MPRJ_IO_PADS_1-2:0],
					 mprj_io_loader_data_1};
    // Note that serial_link_2 is backwards compared to serial_link_1, so it
    // shifts in the other direction.
    assign gpio_serial_link_2_shifted = {mprj_io_loader_data_2,
					 gpio_serial_link_2[`MPRJ_IO_PADS_2-1:1]};

    // Propagating clock and reset to mitigate timing and fanout issues
    wire [`MPRJ_IO_PADS_1-1:0] gpio_clock_1;
    wire [`MPRJ_IO_PADS_2-1:0] gpio_clock_2;
    wire [`MPRJ_IO_PADS_1-1:0] gpio_resetn_1;
    wire [`MPRJ_IO_PADS_2-1:0] gpio_resetn_2;
    wire [`MPRJ_IO_PADS_1-1:0] gpio_clock_1_shifted;
    wire [`MPRJ_IO_PADS_2-1:0] gpio_clock_2_shifted;
    wire [`MPRJ_IO_PADS_1-1:0] gpio_resetn_1_shifted;
    wire [`MPRJ_IO_PADS_2-1:0] gpio_resetn_2_shifted;

    assign gpio_clock_1_shifted = {gpio_clock_1[`MPRJ_IO_PADS_1-2:0],
					 mprj_io_loader_clock};
    assign gpio_clock_2_shifted = {mprj_io_loader_clock,
					gpio_clock_2[`MPRJ_IO_PADS_2-1:1]};
    assign gpio_resetn_1_shifted = {gpio_resetn_1[`MPRJ_IO_PADS_1-2:0],
					 mprj_io_loader_resetn};
    assign gpio_resetn_2_shifted = {mprj_io_loader_resetn,
					gpio_resetn_2[`MPRJ_IO_PADS_2-1:1]};

    // Each control block sits next to an I/O pad in the user area.
    // It gets input through a serial chain from the previous control
    // block and passes it to the next control block.  Due to the nature
    // of the shift register, bits are presented in reverse, as the first
    // bit in ends up as the last bit of the last I/O pad control block.

    // There are two types of block;  the first two and the last two
    // are configured to be full bidirectional under control of the
    // management Soc (JTAG and SDO for the first two;  flash_io2 and
    // flash_io3 for the last two).  The rest are configured to be default
    // (input).  Note that the first two and last two are the ones closest
    // to the management SoC on either side, which minimizes the wire length
    // of the extra signals those pads need.

    /* First two GPIOs (JTAG and SDO) */
    gpio_control_block #(
	.DM_INIT(`DM_INIT),	// Mode = output, strong up/down
	.OENB_INIT(`OENB_INIT)	// Enable output signaling from wire
    ) gpio_control_bidir_1 [1:0] (
    	`ifdef USE_POWER_PINS
			.vccd(vccd_core),
			.vssd(vssd_core),
			.vccd1(vccd1_core),
			.vssd1(vssd1_core),
        `endif

    	// Management Soc-facing signals

    	.resetn(gpio_resetn_1_shifted[1:0]),
    	.serial_clock(gpio_clock_1_shifted[1:0]),

    	.resetn_out(gpio_resetn_1[1:0]),
    	.serial_clock_out(gpio_clock_1[1:0]),

    	.mgmt_gpio_in(mgmt_io_in[1:0]),
		.mgmt_gpio_out({sdo_out, jtag_out}),
		.mgmt_gpio_oeb({sdo_outenb, jtag_outenb}),

        .one(),
        .zero(),

    	// Serial data chain for pad configuration
    	.serial_data_in(gpio_serial_link_1_shifted[1:0]),
    	.serial_data_out(gpio_serial_link_1[1:0]),

    	// User-facing signals
    	.user_gpio_out(user_io_out[1:0]),
    	.user_gpio_oeb(user_io_oeb[1:0]),
    	.user_gpio_in(user_io_in[1:0]),

    	// Pad-facing signals (Pad GPIOv2)
    	.pad_gpio_inenb(mprj_io_inp_dis[1:0]),
    	.pad_gpio_ib_mode_sel(mprj_io_ib_mode_sel[1:0]),
    	.pad_gpio_vtrip_sel(mprj_io_vtrip_sel[1:0]),
    	.pad_gpio_slow_sel(mprj_io_slow_sel[1:0]),
    	.pad_gpio_holdover(mprj_io_holdover[1:0]),
    	.pad_gpio_ana_en(mprj_io_analog_en[1:0]),
    	.pad_gpio_ana_sel(mprj_io_analog_sel[1:0]),
    	.pad_gpio_ana_pol(mprj_io_analog_pol[1:0]),
    	.pad_gpio_dm(mprj_io_dm[5:0]),
    	.pad_gpio_outenb(mprj_io_oeb[1:0]),
    	.pad_gpio_out(mprj_io_out[1:0]),
    	.pad_gpio_in(mprj_io_in[1:0])
    );

    /* Section 1 GPIOs (GPIO 0 to 18) */
    wire [`MPRJ_IO_PADS_1-1:2] one_loop1;
    gpio_control_block gpio_control_in_1 [`MPRJ_IO_PADS_1-3:0] (
    `ifdef USE_POWER_PINS
        .vccd(vccd_core),
		.vssd(vssd_core),
		.vccd1(vccd1_core),
		.vssd1(vssd1_core),
    `endif

    	// Management Soc-facing signals

    	.resetn(gpio_resetn_1_shifted[(`MPRJ_IO_PADS_1-1):2]),
    	.serial_clock(gpio_clock_1_shifted[(`MPRJ_IO_PADS_1-1):2]),

    	.resetn_out(gpio_resetn_1[(`MPRJ_IO_PADS_1-1):2]),
    	.serial_clock_out(gpio_clock_1[(`MPRJ_IO_PADS_1-1):2]),

		.mgmt_gpio_in(mgmt_io_in[(`MPRJ_IO_PADS_1-1):2]),
		.mgmt_gpio_out(mgmt_io_in[(`MPRJ_IO_PADS_1-1):2]),
		.mgmt_gpio_oeb(one_loop1),

        .one(one_loop1),
        .zero(),

    	// Serial data chain for pad configuration
    	.serial_data_in(gpio_serial_link_1_shifted[(`MPRJ_IO_PADS_1-1):2]),
    	.serial_data_out(gpio_serial_link_1[(`MPRJ_IO_PADS_1-1):2]),

    	// User-facing signals
    	.user_gpio_out(user_io_out[(`MPRJ_IO_PADS_1-1):2]),
    	.user_gpio_oeb(user_io_oeb[(`MPRJ_IO_PADS_1-1):2]),
    	.user_gpio_in(user_io_in[(`MPRJ_IO_PADS_1-1):2]),

    	// Pad-facing signals (Pad GPIOv2)
    	.pad_gpio_inenb(mprj_io_inp_dis[(`MPRJ_IO_PADS_1-1):2]),
    	.pad_gpio_ib_mode_sel(mprj_io_ib_mode_sel[(`MPRJ_IO_PADS_1-1):2]),
    	.pad_gpio_vtrip_sel(mprj_io_vtrip_sel[(`MPRJ_IO_PADS_1-1):2]),
    	.pad_gpio_slow_sel(mprj_io_slow_sel[(`MPRJ_IO_PADS_1-1):2]),
    	.pad_gpio_holdover(mprj_io_holdover[(`MPRJ_IO_PADS_1-1):2]),
    	.pad_gpio_ana_en(mprj_io_analog_en[(`MPRJ_IO_PADS_1-1):2]),
    	.pad_gpio_ana_sel(mprj_io_analog_sel[(`MPRJ_IO_PADS_1-1):2]),
    	.pad_gpio_ana_pol(mprj_io_analog_pol[(`MPRJ_IO_PADS_1-1):2]),
    	.pad_gpio_dm(mprj_io_dm[(`MPRJ_IO_PADS_1*3-1):6]),
    	.pad_gpio_outenb(mprj_io_oeb[(`MPRJ_IO_PADS_1-1):2]),
    	.pad_gpio_out(mprj_io_out[(`MPRJ_IO_PADS_1-1):2]),
    	.pad_gpio_in(mprj_io_in[(`MPRJ_IO_PADS_1-1):2])
    );

    /* Last two GPIOs (flash_io2 and flash_io3) */
    gpio_control_block #(
	.DM_INIT(`DM_INIT),	// Mode = output, strong up/down
	.OENB_INIT(`OENB_INIT)	// Enable output signaling from wire
    ) gpio_control_bidir_2 [1:0] (
    	`ifdef USE_POWER_PINS
			.vccd(vccd_core),
			.vssd(vssd_core),
			.vccd1(vccd1_core),
			.vssd1(vssd1_core),
        `endif

    	// Management Soc-facing signals

    	.resetn(gpio_resetn_1_shifted[(`MPRJ_IO_PADS_2-1):(`MPRJ_IO_PADS_2-2)]),
    	.serial_clock(gpio_clock_1_shifted[(`MPRJ_IO_PADS_2-1):(`MPRJ_IO_PADS_2-2)]),

    	.resetn_out(gpio_resetn_1[(`MPRJ_IO_PADS_2-1):(`MPRJ_IO_PADS_2-2)]),
    	.serial_clock_out(gpio_clock_1[(`MPRJ_IO_PADS_2-1):(`MPRJ_IO_PADS_2-2)]),

    	.mgmt_gpio_in(mgmt_io_in[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
		.mgmt_gpio_out({gpio_flash_io3_out, gpio_flash_io2_out}),
		.mgmt_gpio_oeb({flash_io3_oeb_core, flash_io2_oeb_core}),

        .one(),
        .zero(),

    	// Serial data chain for pad configuration
    	.serial_data_in(gpio_serial_link_2_shifted[(`MPRJ_IO_PADS_2-1):(`MPRJ_IO_PADS_2-2)]),
    	.serial_data_out(gpio_serial_link_2[(`MPRJ_IO_PADS_2-1):(`MPRJ_IO_PADS_2-2)]),

    	// User-facing signals
    	.user_gpio_out(user_io_out[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
    	.user_gpio_oeb(user_io_oeb[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
    	.user_gpio_in(user_io_in[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),

    	// Pad-facing signals (Pad GPIOv2)
    	.pad_gpio_inenb(mprj_io_inp_dis[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
    	.pad_gpio_ib_mode_sel(mprj_io_ib_mode_sel[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
    	.pad_gpio_vtrip_sel(mprj_io_vtrip_sel[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
    	.pad_gpio_slow_sel(mprj_io_slow_sel[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
    	.pad_gpio_holdover(mprj_io_holdover[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
    	.pad_gpio_ana_en(mprj_io_analog_en[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
    	.pad_gpio_ana_sel(mprj_io_analog_sel[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
    	.pad_gpio_ana_pol(mprj_io_analog_pol[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
    	.pad_gpio_dm(mprj_io_dm[(`MPRJ_IO_PADS*3-1):(`MPRJ_IO_PADS*3-6)]),
    	.pad_gpio_outenb(mprj_io_oeb[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
    	.pad_gpio_out(mprj_io_out[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)]),
    	.pad_gpio_in(mprj_io_in[(`MPRJ_IO_PADS-1):(`MPRJ_IO_PADS-2)])
    );

    /* Section 2 GPIOs (GPIO 19 to 37) */
    wire [`MPRJ_IO_PADS_2-3:0] one_loop2;
    gpio_control_block gpio_control_in_2 [`MPRJ_IO_PADS_2-3:0] (
    	`ifdef USE_POWER_PINS
        .vccd(vccd_core),
		.vssd(vssd_core),
		.vccd1(vccd1_core),
		.vssd1(vssd1_core),
        `endif

    	// Management Soc-facing signals

    	.resetn(gpio_resetn_1_shifted[(`MPRJ_IO_PADS_2-3):0]),
    	.serial_clock(gpio_clock_1_shifted[(`MPRJ_IO_PADS_2-3):0]),

    	.resetn_out(gpio_resetn_1[(`MPRJ_IO_PADS_2-3):0]),
    	.serial_clock_out(gpio_clock_1[(`MPRJ_IO_PADS_2-3):0]),

		.mgmt_gpio_in(mgmt_io_in[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
		.mgmt_gpio_out(mgmt_io_in[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
		.mgmt_gpio_oeb(one_loop2),

        .one(one_loop2),
        .zero(),

    	// Serial data chain for pad configuration
    	.serial_data_in(gpio_serial_link_2_shifted[(`MPRJ_IO_PADS_2-3):0]),
    	.serial_data_out(gpio_serial_link_2[(`MPRJ_IO_PADS_2-3):0]),

    	// User-facing signals
    	.user_gpio_out(user_io_out[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
    	.user_gpio_oeb(user_io_oeb[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
    	.user_gpio_in(user_io_in[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),

    	// Pad-facing signals (Pad GPIOv2)
    	.pad_gpio_inenb(mprj_io_inp_dis[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
    	.pad_gpio_ib_mode_sel(mprj_io_ib_mode_sel[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
    	.pad_gpio_vtrip_sel(mprj_io_vtrip_sel[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
    	.pad_gpio_slow_sel(mprj_io_slow_sel[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
    	.pad_gpio_holdover(mprj_io_holdover[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
    	.pad_gpio_ana_en(mprj_io_analog_en[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
    	.pad_gpio_ana_sel(mprj_io_analog_sel[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
    	.pad_gpio_ana_pol(mprj_io_analog_pol[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
    	.pad_gpio_dm(mprj_io_dm[(`MPRJ_IO_PADS*3-7):(`MPRJ_IO_PADS_1*3)]),
    	.pad_gpio_outenb(mprj_io_oeb[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
    	.pad_gpio_out(mprj_io_out[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)]),
    	.pad_gpio_in(mprj_io_in[(`MPRJ_IO_PADS-3):(`MPRJ_IO_PADS_1)])
    );

    user_id_programming #(
	.USER_PROJECT_ID(USER_PROJECT_ID)
    ) user_id_value (
	`ifdef USE_POWER_PINS
		.VPWR(vccd_core),
		.VGND(vssd_core),
	`endif
	.mask_rev(mask_rev)
    );

    // Power-on-reset circuit
    simple_por por (
	`ifdef USE_POWER_PINS
		.vdd3v3(vddio_core),
		.vdd1v8(vccd_core),
		.vss(vssio_core),
	`endif
		.porb_h(porb_h),
		.porb_l(porb_l),
		.por_l(por_l)
    );

    // XRES (chip input pin reset) reset level converter
    sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped rstb_level (
	`ifdef USE_POWER_PINS
		.VPWR(vddio_core),
		.LVPWR(vccd_core),
		.VGND(vssio_core),
	`endif
		.A(rstb_h),
		.X(rstb_l)
    );

	// Storage area
	storage storage(
	`ifdef USE_POWER_PINS
        .VPWR(vccd_core),
        .VGND(vssd_core),
    `endif
		.mgmt_clk(caravel_clk),
        .mgmt_ena(mgmt_ena),
        .mgmt_wen(mgmt_wen),
        .mgmt_wen_mask(mgmt_wen_mask),
        .mgmt_addr(mgmt_addr),
        .mgmt_wdata(mgmt_wdata),
        .mgmt_rdata(mgmt_rdata),
        // Management RO interface
        .mgmt_ena_ro(mgmt_ena_ro),
        .mgmt_addr_ro(mgmt_addr_ro),
        .mgmt_rdata_ro(mgmt_rdata_ro)
	);

endmodule
// `default_nettype wire