Warp-SE/cpld/MXSE.v
2021-10-29 06:04:59 -04:00

120 lines
2.7 KiB
Verilog

module MXSE(
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,
input nBERR_IOB,
input nRES,
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);
/* AS cycle detection */
wire BACT;
/* Refresh request/ack signals */
wire RefReq, RefUrgent, RefAck;
wire IOCS, SCSICS, IOPWCS, IACS, ROMCS, RAMCS, SndRAMCSWR;
CS cs(
/* MC68HC000 interface */
A_FSB[23:08], CLK_FSB, nRES, 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, RefAck,
/* 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);
IOBM iobm(
/* PDS interface */
CLK2X_IOB, CLK_IOB, E_IOB,
nAS_IOB, nLDS_IOB, nUDS_IOB, nVMA_IOB,
nDTACK_IOB, nVPA_IOB, nBERR_IOB, nRES,
/* PDS address and data latch control */
nAoutOE, nDoutOE, ALE0M, nDinLE,
/* IO bus slave port interface */
IOACT, IOBERR, IOREQ, IOL0, IOU0, IORW0);
wire TimeoutA, TimeoutB;
CNT cnt(
/* FSB clock and AS detection */
CLK_FSB, BACT,
/* Refresh request */
RefReq, RefUrgent, RefAck,
/* Timeout signals */
TimeoutA, TimeoutB);
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 && ~TimeoutA),
/* BERR inputs */
(~SCSICS && TimeoutB), BERR_IOBS,
/* Interrupt acknowledge select */
IACS);
endmodule