| |
| /* |
| * PicoSoC - A simple example SoC using PicoRV32 |
| * |
| * Copyright (C) 2017 Clifford Wolf <clifford@clifford.at> |
| * |
| * Permission to use, copy, modify, and/or distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| * |
| */ |
| |
| module ice40up5k_spram #( |
| // We current always use the whole SPRAM (128 kB) |
| parameter integer WORDS = 32768 |
| ) ( |
| input clk, |
| input [3:0] wen, |
| input [21:0] addr, |
| input [31:0] wdata, |
| output [31:0] rdata |
| ); |
| |
| wire cs_0, cs_1; |
| wire [31:0] rdata_0, rdata_1; |
| |
| assign cs_0 = !addr[14]; |
| assign cs_1 = addr[14]; |
| assign rdata = addr[14] ? rdata_1 : rdata_0; |
| |
| SB_SPRAM256KA ram00 ( |
| .ADDRESS(addr[13:0]), |
| .DATAIN(wdata[15:0]), |
| .MASKWREN({wen[1], wen[1], wen[0], wen[0]}), |
| .WREN(wen[1]|wen[0]), |
| .CHIPSELECT(cs_0), |
| .CLOCK(clk), |
| .STANDBY(1'b0), |
| .SLEEP(1'b0), |
| .POWEROFF(1'b1), |
| .DATAOUT(rdata_0[15:0]) |
| ); |
| |
| SB_SPRAM256KA ram01 ( |
| .ADDRESS(addr[13:0]), |
| .DATAIN(wdata[31:16]), |
| .MASKWREN({wen[3], wen[3], wen[2], wen[2]}), |
| .WREN(wen[3]|wen[2]), |
| .CHIPSELECT(cs_0), |
| .CLOCK(clk), |
| .STANDBY(1'b0), |
| .SLEEP(1'b0), |
| .POWEROFF(1'b1), |
| .DATAOUT(rdata_0[31:16]) |
| ); |
| |
| SB_SPRAM256KA ram10 ( |
| .ADDRESS(addr[13:0]), |
| .DATAIN(wdata[15:0]), |
| .MASKWREN({wen[1], wen[1], wen[0], wen[0]}), |
| .WREN(wen[1]|wen[0]), |
| .CHIPSELECT(cs_1), |
| .CLOCK(clk), |
| .STANDBY(1'b0), |
| .SLEEP(1'b0), |
| .POWEROFF(1'b1), |
| .DATAOUT(rdata_1[15:0]) |
| ); |
| |
| SB_SPRAM256KA ram11 ( |
| .ADDRESS(addr[13:0]), |
| .DATAIN(wdata[31:16]), |
| .MASKWREN({wen[3], wen[3], wen[2], wen[2]}), |
| .WREN(wen[3]|wen[2]), |
| .CHIPSELECT(cs_1), |
| .CLOCK(clk), |
| .STANDBY(1'b0), |
| .SLEEP(1'b0), |
| .POWEROFF(1'b1), |
| .DATAOUT(rdata_1[31:16]) |
| ); |
| |
| endmodule |