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techav 2021-07-03 22:35:16 -05:00
parent 96dbd98368
commit e457b3fec4
2 changed files with 1516 additions and 28 deletions
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@ -12,6 +12,7 @@ module paste (
inout wire ncpuReset, // 68030 reset signal (tristate)
inout wire ncpuHalt, // 68030 halt signal (tristate)
input wire ncpuDS, // 68030 data strobe signal
input wire ncpuAS, // 68030 address strobe signal
output wire ncpuDsack0, // 68030 DS Ack 0 signal
output wire ncpuDsack1, // 68030 DS Ack 1 signal
input wire cpuSize0, // 68030 Size 0 signal
@ -29,6 +30,7 @@ module paste (
input wire npdsReset, // PDS Reset signal
inout wire npdsLds, // PDS Lower Data Strobe signal
inout wire npdsUds, // PDS Upper Data Strobe signal
inout wire npdsAs, // PDS Address Strobe signal
input wire npdsDtack, // PDS Data Xfer Ack signal
input wire npdsBg, // PDS Bus Grant signal
output wire npdsBGack, // PDS Bus Grant Ack signal
@ -66,6 +68,13 @@ wire nDsack68; // 6800 bus termination signal
wire nDsackSE; // SE bus termination signal
wire nUD; // SE upper data byte select
wire nLD; // SE lower data byte select
reg nAS; // SE address strobe
// D-latch to synchronize nAS to 8MHz clock
always @(posedge pdsC8m or negedge npdsReset) begin
if(npdsReset == 0) nAS <= 1;
else nAS <= ncpuAS;
end
// state machine for npdsVma generation
always @(posedge pdsC8m or negedge npdsReset) begin
@ -225,6 +234,9 @@ always @(posedge cpuClock or negedge npdsReset) begin
end
// and finally, our combinatorial logic
assign nUD = ~(~cpuA0 || cpuRnW);
assign nLD = ~(cpuA0 || ~cpuSize0 || cpuSize1 || cpuRnW);
always_comb begin
// DSACK intermediary signals
if(dsack68genState == S1) begin
@ -238,43 +250,37 @@ always_comb begin
nDsackSE <= 1'b1;
end
// Upper/Lower data byte intermediary signals
if(~cpuA0 || cpuRnW) begin
nUD <= 1'b0;
// Upper/Lower data strobes
if(npdsBg == 1) begin
npdsUds <= 1'bZ;
npdsLds <= 1'bZ;
end else begin
nUD <= 1'b1;
end
if(cpuA0 || ~cpuSize0 || cpuSize1 || cpuRnW) begin
nLD <= 1'b0;
end else begin
nLD <= 1'b1;
if(ncpuDS == 0 && nUD == 0) npdsUds <= 0;
else npdsUds <= 1;
if(ncpuDS == 0 && nLD == 0) npdsLds <= 0;
else npdsLds <= 1;
end
// Upper/Lower data strobes
if(~ncpuDS || ~nUD) begin
npdsUds <= 1'b0;
// Address strobe
if(npdsBg == 1) begin
npdsAs <= 1'bZ;
end else begin
npdsUds <= 1'bZ;
end
if(~ncpuDS || ~nLD) begin
npdsLds <= 1'b0;
end else begin
npdsLds <= 1'bZ;
npdsAs <= nAS;
end
// buffer enable signals
if(ncpuBG == 1'b1) begin
if(~nUD || ~npdsBg) begin
if(nUD == 0 && npdsBg == 0) begin
nbufDhiEn <= 1'b0;
end else begin
nbufDhiEn <= 1'b1;
end
if(~nLD || nUD || ~npdsBg) begin
if(nLD == 0 && nUD == 1 && npdsBg == 0) begin
nbufDlo2En <= 1'b0;
end else begin
nbufDlo2En <= 1'b1;
end
if(~nLD || ~nUD || ~npdsBg) begin
if(nLD == 0 && nUD == 0 && npdsBg == 0) begin
nbufDlo1En <= 1'b0;
end else begin
nbufDlo1En <= 1'b1;
@ -312,19 +318,29 @@ always_comb begin
end
// DS Ack signals
if((nDsack68 == 1'b0 || (nDsackSE == 1'b0 && cpuAddrHi < 4'h5)) && cpuFC < 3'h7) begin
ncpuDsack0 <= 1'b0;
// 8-bit: ncpuDsack1=1, ncpuDsack0=0
// 16-bit: ncpuDsack1=0, ncpuDsack0=1
// nDsack68 is always an 8-bit transfer
// nDsackSE is a 16-bit transfer below address $50,0000
// nDsackSE is an 8-bit transfer above address $50,0000, inclusive
if(
(
nDsack68 == 0 ||
(nDsackSE == 0 && cpuAddrHi >= 4'h5)
)
&& cpuFC < 3'h7 ) begin
ncpuDsack0 <= 0;
end else begin
ncpuDsack0 <= 1'b1;
ncpuDsack0 <= 1;
end
if(nDsackSE == 1'b0 && cpuAddrHi >= 4'h5 && cpuFC < 3'h7) begin
ncpuDsack1 <= 1'b0;
if(nDsackSE == 0 && cpuAddrHi < 4'h5 && cpuFC < 3'h7) begin
ncpuDsack1 <= 0;
end else begin
ncpuDsack1 <= 1'b1;
ncpuDsack1 <= 1;
end
// CPU reset signals
if(resetgenState == S2) begin
if(resetgenState != S2) begin
ncpuReset <= 1'b0;
ncpuHalt <= 1'b0;
end else begin