| // 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 |
| |
| `default_nettype none |
| /* |
| Building blocks for DFF based RAM compiler for SKY130A |
| BYTE : 8 memory cells used as a building block for WORD module |
| WORD : 32-bit memory word with select and byte-level WE |
| DEC6x64 : 2x4 Binary Decoder |
| DEC6x64 : 6x64 Binary decoder |
| MUX4x1_32 : 32-bit 4x1 MUX |
| MUX2x1_32 : 32-bit 2x1 MUX |
| SRAM64x32 : Tri-state buffers based 64x32 DFF RAM |
| DFFRAM_COL4 : A single column of 4 SRAM64x32 blocks using 4x1 multiplexors |
| */ |
| /* |
| Author: Mohamed Shalan (mshalan@aucegypt.edu) |
| */ |
| |
| module BYTE ( |
| `ifdef USE_POWER_PINS |
| input VPWR, |
| input VGND, |
| `endif |
| input CLK, |
| input WE, |
| input SEL, |
| input [7:0] Di, |
| output [7:0] Do |
| ); |
| |
| wire [7:0] q_wire; |
| wire we_wire; |
| wire SEL_B; |
| wire GCLK; |
| |
| sky130_fd_sc_hd__inv_1 INV( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .Y(SEL_B), |
| .A(SEL) |
| ); |
| |
| sky130_fd_sc_hd__and2_1 CGAND( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .A(SEL), |
| .B(WE), |
| .X(we_wire) |
| ); |
| |
| sky130_fd_sc_hd__dlclkp_1 CG( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .CLK(CLK), |
| .GCLK(GCLK), |
| .GATE(we_wire) |
| ); |
| |
| generate |
| genvar i; |
| for(i=0; i<8; i=i+1) begin : BIT |
| sky130_fd_sc_hd__dfxtp_1 FF ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .D(Di[i]), |
| .Q(q_wire[i]), |
| .CLK(GCLK) |
| ); |
| |
| sky130_fd_sc_hd__ebufn_2 OBUF ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .A(q_wire[i]), |
| .Z(Do[i]), |
| .TE_B(SEL_B) |
| ); |
| |
| end |
| endgenerate |
| |
| endmodule |
| |
| |
| module WORD32 ( |
| `ifdef USE_POWER_PINS |
| input VPWR, |
| input VGND, |
| `endif |
| input CLK, |
| input [3:0] WE, |
| input SEL, |
| input [31:0] Di, |
| output [31:0] Do |
| ); |
| |
| BYTE B0 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .CLK(CLK), .WE(WE[0]), .SEL(SEL), .Di(Di[7:0]), .Do(Do[7:0]) ); |
| |
| BYTE B1 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .CLK(CLK), .WE(WE[1]), .SEL(SEL), .Di(Di[15:8]), .Do(Do[15:8]) ); |
| |
| BYTE B2 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .CLK(CLK), .WE(WE[2]), .SEL(SEL), .Di(Di[23:16]), .Do(Do[23:16]) ); |
| |
| BYTE B3 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .CLK(CLK), .WE(WE[3]), .SEL(SEL), .Di(Di[31:24]), .Do(Do[31:24]) ); |
| |
| endmodule |
| |
| module DEC1x2 ( |
| `ifdef USE_POWER_PINS |
| input VPWR, |
| input VGND, |
| `endif |
| input EN, |
| input [0:0] A, |
| output [1:0] SEL |
| ); |
| sky130_fd_sc_hd__and2b_2 AND1 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(SEL[0]), |
| .A_N(A), |
| .B(EN) |
| ); |
| |
| sky130_fd_sc_hd__and2_2 AND3 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(SEL[1]), |
| .A(A), |
| .B(A[0]) |
| ); |
| |
| endmodule |
| |
| module DEC2x4 ( |
| `ifdef USE_POWER_PINS |
| input VPWR, |
| input VGND, |
| `endif |
| input EN, |
| input [1:0] A, |
| output [3:0] SEL |
| ); |
| sky130_fd_sc_hd__nor3b_4 AND0 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .Y(SEL[0]), |
| .A(A[0]), |
| .B(A[1]), |
| .C_N(EN) |
| ); |
| |
| sky130_fd_sc_hd__and3b_4 AND1 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(SEL[1]), |
| .A_N(A[1]), |
| .B(A[0]), |
| .C(EN) |
| ); |
| |
| sky130_fd_sc_hd__and3b_4 AND2 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(SEL[2]), |
| .A_N(A[0]), |
| .B(A[1]), |
| .C(EN) |
| ); |
| |
| sky130_fd_sc_hd__and3_4 AND3 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(SEL[3]), |
| .A(A[1]), |
| .B(A[0]), |
| .C(EN) |
| ); |
| |
| endmodule |
| |
| module DEC3x8 ( |
| `ifdef USE_POWER_PINS |
| input VPWR, |
| input VGND, |
| `endif |
| input EN, |
| input [2:0] A, |
| output [7:0] SEL |
| ); |
| sky130_fd_sc_hd__nor4b_2 AND0 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .Y(SEL[0]), |
| .A(A[0]), |
| .B(A[1]), |
| .C(A[2]), |
| .D_N(EN) |
| ); // 000 |
| |
| sky130_fd_sc_hd__and4bb_2 AND1 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(SEL[1]), |
| .A_N(A[2]), |
| .B_N(A[1]), |
| .C(A[0]), |
| .D(EN) |
| ); // 001 |
| |
| sky130_fd_sc_hd__and4bb_2 AND2 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(SEL[2]), |
| .A_N(A[2]), |
| .B_N(A[0]), |
| .C(A[1]), |
| .D(EN) |
| ); // 010 |
| |
| sky130_fd_sc_hd__and4b_2 AND3 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(SEL[3]), |
| .A_N(A[2]), |
| .B(A[1]), |
| .C(A[0]), |
| .D(EN) |
| ); // 011 |
| |
| sky130_fd_sc_hd__and4bb_2 AND4 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(SEL[4]), |
| .A_N(A[0]), |
| .B_N(A[1]), |
| .C(A[2]), |
| .D(EN) |
| ); // 100 |
| |
| sky130_fd_sc_hd__and4b_2 AND5 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(SEL[5]), |
| .A_N(A[1]), |
| .B(A[0]), |
| .C(A[2]), |
| .D(EN) |
| ); // 101 |
| |
| sky130_fd_sc_hd__and4b_2 AND6 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(SEL[6]), |
| .A_N(A[0]), |
| .B(A[1]), |
| .C(A[2]), |
| .D(EN) |
| ); // 110 |
| |
| sky130_fd_sc_hd__and4_2 AND7 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(SEL[7]), |
| .A(A[0]), |
| .B(A[1]), |
| .C(A[2]), |
| .D(EN) |
| ); // 111 |
| endmodule |
| |
| |
| module DEC6x64 ( |
| `ifdef USE_POWER_PINS |
| input VPWR, |
| input VGND, |
| `endif |
| input EN, |
| input [5:0] A, |
| output [63:0] SEL |
| ); |
| wire [7:0] SEL0_w ; |
| wire [2:0] A_buf; |
| |
| DEC3x8 DEC_L0 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .EN(EN), |
| .A(A[5:3]), |
| .SEL(SEL0_w) |
| ); |
| |
| sky130_fd_sc_hd__clkbuf_16 ABUF[2:0] ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(A_buf), |
| .A(A[2:0]) |
| ); |
| |
| generate |
| genvar i; |
| for(i=0; i<8; i=i+1) begin : DEC_L1 |
| DEC3x8 U ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .EN(SEL0_w[i]), |
| .A(A_buf), |
| .SEL(SEL[7+8*i: 8*i]) |
| ); |
| end |
| endgenerate |
| endmodule |
| |
| module MUX2x1_32( |
| `ifdef USE_POWER_PINS |
| input VPWR, |
| input VGND, |
| `endif |
| input [31:0] A0, A1, |
| input [0:0] S, |
| output [31:0] X |
| ); |
| sky130_fd_sc_hd__mux2_1 MUX[31:0] ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .A0(A0), |
| .A1(A1), |
| .S(S[0]), |
| .X(X) |
| ); |
| |
| endmodule |
| |
| module MUX4x1_32( |
| `ifdef USE_POWER_PINS |
| input VPWR, |
| input VGND, |
| `endif |
| input [31:0] A0, A1, A2, A3, |
| input [1:0] S, |
| output [31:0] X |
| ); |
| sky130_fd_sc_hd__mux4_1 MUX[31:0] ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .A0(A0), |
| .A1(A1), |
| .A2(A2), |
| .A3(A3), |
| .S0(S[0]), |
| .S1(S[1]), |
| .X(X) |
| ); |
| endmodule |
| |
| module PASS ( |
| `ifdef USE_POWER_PINS |
| input VPWR, |
| input VGND, |
| `endif |
| input [31:0] A, |
| output [31:0] X |
| ); |
| assign X = A; |
| endmodule |
| |
| module SRAM64x32( |
| `ifdef USE_POWER_PINS |
| input VPWR, |
| input VGND, |
| `endif |
| input CLK, |
| input [3:0] WE, |
| input EN, |
| input [31:0] Di, |
| output [31:0] Do, |
| input [5:0] A |
| ); |
| |
| wire [63:0] SEL; |
| wire [31:0] Do_pre; |
| wire [31:0] Di_buf; |
| wire CLK_buf; |
| wire [3:0] WE_buf; |
| |
| sky130_fd_sc_hd__clkbuf_16 CLKBUF ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(CLK_buf), |
| .A(CLK) |
| ); |
| |
| sky130_fd_sc_hd__clkbuf_16 WEBUF[3:0] ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(WE_buf), |
| .A(WE) |
| ); |
| |
| sky130_fd_sc_hd__clkbuf_16 DIBUF[31:0] ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(Di_buf), |
| .A(Di) |
| ); |
| |
| DEC6x64 DEC ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .EN(EN), |
| .A(A), |
| .SEL(SEL) |
| ); |
| |
| generate |
| genvar i; |
| for (i=0; i< 64; i=i+1) begin : WORD |
| WORD32 W ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .CLK(CLK_buf), |
| .WE(WE_buf), |
| .SEL(SEL[i]), |
| .Di(Di_buf), |
| .Do(Do_pre) |
| ); |
| end |
| endgenerate |
| |
| // Ensure that the Do_pre lines are not floating when EN = 0 |
| wire lo; |
| wire float_buf_en; |
| sky130_fd_sc_hd__clkbuf_4 FBUFENBUF( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(float_buf_en), |
| .A(EN) |
| ); |
| |
| sky130_fd_sc_hd__conb_1 TIE ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .LO(lo), |
| .HI() |
| ); |
| |
| sky130_fd_sc_hd__ebufn_4 FLOATBUF[31:0] ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .A( lo ), |
| .Z(Do_pre), |
| .TE_B(float_buf_en) |
| ); |
| |
| generate |
| //genvar i; |
| for(i=0; i<32; i=i+1) begin : OUT |
| sky130_fd_sc_hd__dfxtp_1 FF ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .D(Do_pre[i]), |
| .Q(Do[i]), |
| .CLK(CLK) |
| ); |
| end |
| endgenerate |
| |
| endmodule |
| |
| module DFFRAM_COL4 |
| ( |
| `ifdef USE_POWER_PINS |
| VPWR, |
| VGND, |
| `endif |
| CLK, |
| WE, |
| EN, |
| Di, |
| Do, |
| A |
| ); |
| |
| input CLK; |
| input [3:0] WE; |
| input EN; |
| input [31:0] Di; |
| output [31:0] Do; |
| input [7:0] A; |
| |
| `ifdef USE_POWER_PINS |
| input VPWR; |
| input VGND; |
| `endif |
| |
| wire [31:0] Di_buf; |
| wire [31:0] Do_pre; |
| wire CLK_buf; |
| wire [3:0] WE_buf; |
| wire [5:3] A_buf; |
| |
| wire [31:0] Do_B_0_0; |
| wire [31:0] Do_B_0_1; |
| wire [31:0] Do_B_0_2; |
| wire [31:0] Do_B_0_3; |
| |
| wire [3:0] row_sel; |
| |
| sky130_fd_sc_hd__clkbuf_8 CLKBUF ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(CLK_buf), |
| .A(CLK) |
| ); |
| |
| sky130_fd_sc_hd__clkbuf_8 WEBUF[3:0] ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(WE_buf), |
| .A(WE) |
| ); |
| |
| sky130_fd_sc_hd__clkbuf_8 DIBUF[31:0] ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(Di_buf), |
| .A(Di) |
| ); |
| |
| sky130_fd_sc_hd__clkbuf_16 ABUF[2:0] ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| .VPB(VPWR), |
| .VNB(VGND), |
| `endif |
| .X(A_buf), |
| .A(A[5:3]) |
| ); |
| |
| DEC2x4 DEC ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .EN(EN), |
| .A(A[7:6]), |
| .SEL(row_sel) |
| ); |
| |
| SRAM64x32 B_0_0 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .CLK(CLK_buf), |
| .WE(WE_buf), |
| .EN(row_sel[0]), |
| .Di(Di_buf), |
| .Do(Do_B_0_0), |
| .A({A_buf,A[2:0]}) |
| ); |
| |
| SRAM64x32 B_0_1 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .CLK(CLK_buf), |
| .WE(WE_buf), |
| .EN(row_sel[1]), |
| .Di(Di_buf), |
| .Do(Do_B_0_1), |
| .A({A_buf,A[2:0]}) |
| ); |
| |
| SRAM64x32 B_0_2 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .CLK(CLK_buf), |
| .WE(WE_buf), |
| .EN(row_sel[2]), |
| .Di(Di_buf), |
| .Do(Do_B_0_2), |
| .A({A_buf,A[2:0]}) |
| ); |
| |
| SRAM64x32 B_0_3 ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .CLK(CLK_buf), |
| .WE(WE_buf), |
| .EN(row_sel[3]), |
| .Di(Di_buf), |
| .Do(Do_B_0_3), |
| .A({A_buf,A[2:0]}) |
| ); |
| |
| MUX4x1_32 MUX ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VGND(VGND), |
| `endif |
| .A0(Do_B_0_0), |
| .A1(Do_B_0_1), |
| .A2(Do_B_0_2), |
| .A3(Do_B_0_3), |
| .S(A[7:6]), |
| .X(Do) |
| ); |
| |
| endmodule |
| |
