Warp-SE/cpld/WarpSE.v
Zane Kaminski a91c6c4ffb New stuff
2022-09-03 21:32:05 -04:00

148 lines
3.4 KiB
Verilog

module WarpSE(
input [23:1] A_FSB,
input nAS_FSB,
input nLDS_FSB,
input nUDS_FSB,
input nWE_FSB,
output nDTACK_FSB,
output nVPA_FSB,
output nBERR_FSB,
input CLK_FSB,
input CLK2X_IOB,
input CLK_IOB,
input E_IOB,
input nDTACK_IOB,
input nVPA_IOB,
output nVMA_IOB,
output nAS_IOB,
output nUDS_IOB,
output nLDS_IOB,
output nBR_IOB,
input nBG_IOB,
input nBERR_IOB,
inout nRES,
input nIPL2,
output nROMCS,
output nRAMLWE,
output nRAMUWE,
output nROMWE,
output nRAS,
output nCAS,
output [11:0] RA,
output nOE,
output nADoutLE0,
output nADoutLE1,
output nAoutOE,
output nDoutOE,
output nDinOE,
output nDinLE,
input [3:1] SW,
output C20MEN,
output C25MEN);
/* Reset input and open-drain output */
wire nRESin = nRES;
wire nRESout;
assign nRES = !nRESout ? 1'b0 : 1'bZ;
/* AS cycle detection */
wire BACT;
/* Refresh request/ack signals */
wire RefReq, RefUrgent;
/* Fast ROM enable setting */
wire FastROMEN;
wire IOCS, SCSICS, IOPWCS, IACS, ROMCS, RAMCS, SndRAMCSWR;
CS cs(
/* Setting input */
FastROMEN,
/* MC68HC000 interface */
A_FSB[23:08], CLK_FSB, nRESin, nWE_FSB,
/* AS cycle detection */
BACT,
/* Device select outputs */
IOCS, SCSICS, IOPWCS, IACS, ROMCS, RAMCS, SndRAMCSWR);
wire Ready_RAM;
RAM ram(
/* MC68HC000 interface */
CLK_FSB, A_FSB[21:1], nWE_FSB, nAS_FSB, nLDS_FSB, nUDS_FSB,
/* AS cycle detection */
BACT,
/* Select and ready signals */
RAMCS, ROMCS, Ready_RAM,
/* Refresh Counter Interface */
RefReq, RefUrgent,
/* DRAM and NOR flash interface */
RA[11:0], nRAS, nCAS,
nRAMLWE, nRAMUWE, nOE, nROMCS, nROMWE);
wire Ready_IOBS, BERR_IOBS;
wire IOREQ, IOACT, IOBERR;
wire ALE0S, ALE0M, ALE1;
assign nADoutLE0 = ~(ALE0S || ALE0M);
assign nADoutLE1 = ~ALE1;
wire IORW0, IOL0, IOU0;
IOBS iobs(
/* MC68HC000 interface */
CLK_FSB, nWE_FSB, nAS_FSB, nLDS_FSB, nUDS_FSB,
/* AS cycle detection, FSB BERR */
BACT,
/* Select and ready signals */
IOCS, IOPWCS, Ready_IOBS, BERR_IOBS,
/* Read data OE control */
nDinOE,
/* IOB Master Controller Interface */
IOREQ, IOACT, IOBERR,
/* FIFO primary level control */
ALE0S, IORW0, IOL0, IOU0,
/* FIFO secondary level control */
ALE1);
wire nAS_IOBout, nLDS_IOBout, nUDS_IOBout, nVMA_IOBout;
assign nAS_IOB = nAoutOE ? 1'bZ : nAS_IOBout;
assign nLDS_IOB = nAoutOE ? 1'bZ : nLDS_IOBout;
assign nUDS_IOB = nAoutOE ? 1'bZ : nUDS_IOBout;
assign nVMA_IOB = nAoutOE ? 1'bZ : nVMA_IOBout;
IOBM iobm(
/* PDS interface */
CLK2X_IOB, CLK_IOB, E_IOB,
nAS_IOBout, nLDS_IOBout, nUDS_IOBout, nVMA_IOBout,
nAS_IOB, nBG_IOB, nDTACK_IOB, nVPA_IOB, nBERR_IOB, nRESin,
/* PDS address and data latch control */
nAoutOE, nDoutOE, ALE0M, nDinLE,
/* IO bus slave port interface */
IOACT, IOBERR,
IOREQ, IOL0, IOU0, IORW0);
wire BERRTimeout, QoSReady;
CNT cnt(
/* C16M clock */
C16M,
/* FSB clock and bus active signal */
FCLK, BACT,
/* Refresh request */
RefReq, RefUrgent,
/* BERR and QoS speed limit output */
BERRTimeout, QoSReady,
/* Reset, switch, button */
SW[3:1], nRESin, nRESout, nIPL2,
/* Configuration outputs */
nBR_IOB, FastROMEN, C20MEN, C25MEN);
FSB fsb(
/* MC68HC000 interface */
CLK_FSB, nAS_FSB, nDTACK_FSB, nVPA_FSB, nBERR_FSB,
/* AS cycle detection */
BACT,
/* Ready and IA inputs */
Ready_RAM, Ready_IOBS, (!SndRAMCSWR || QoSReady),
/* BERR inputs */
(~IOCS && BERRTimeout), BERR_IOBS,
/* Interrupt acknowledge select */
IACS);
endmodule