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Added HCLK and HRESETn

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This commit is contained in:
David Harris 2021-01-30 00:56:12 -05:00
parent 9511dcac84
commit 26c560fba3
11 changed files with 71 additions and 59 deletions
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8
wally-pipelined/src/ahblite.sv
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@ -49,9 +49,10 @@ module ahblite (
// AHB-Lite external signals
input logic [`AHBW-1:0] HRDATA,
input logic HREADY, HRESP,
output logic [31:0] HADDR,
output logic HCLK, HRESETn,
output logic [31:0] HADDR,
output logic [`AHBW-1:0] HWDATA,
output logic HWRITE,
output logic HWRITE,
output logic [2:0] HSIZE,
output logic [2:0] HBURST,
output logic [3:0] HPROT,
@ -59,7 +60,6 @@ module ahblite (
output logic HMASTLOCK
);
logic HCLK, HRESETn;
logic GrantData;
logic [2:0] ISize;
logic [`AHBW-1:0] HRDATAMasked;
@ -82,7 +82,7 @@ module ahblite (
assign HADDR = GrantData ? DPAdrM[31:0] : IPAdrD[31:0];
assign HWDATA = DWDataM;
//flop #(`XLEN) wdreg(HCLK, DWDataM, HWDATA); // delay HWDATA by 1 cycle per spec; *** assumes AHBW = XLEN
assign HWRITE = DWriteM; // *** check no level to pulse conversion needed
assign HWRITE = DWriteM;
assign HSIZE = GrantData ? {1'b0, DSizeM} : ISize;
assign HBURST = 3'b000; // Single burst only supported; consider generalizing for cache fillsfHPROT
assign HPROT = 4'b0011; // not used; see Section 3.7

10
wally-pipelined/src/clint.sv
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@ -27,7 +27,7 @@
`include "wally-config.vh"
module clint (
input logic clk, reset,
input logic HCLK, HRESETn,
input logic [1:0] MemRWclint,
input logic [15:0] HADDR,
input logic [`XLEN-1:0] HWDATA,
@ -66,8 +66,8 @@ module clint (
default: HREADCLINT = 0;
endcase
end
always_ff @(posedge clk or posedge reset)
if (reset) begin
always_ff @(posedge HCLK or negedge HRESETn)
if (~HRESETn) begin
MSIP <= 0;
MTIME <= 0;
MTIMECMP <= 0;
@ -90,8 +90,8 @@ module clint (
default: HREADCLINT = 0;
endcase
end
always_ff @(posedge clk or posedge reset)
if (reset) begin
always_ff @(posedge HCLK or negedge HRESETn)
if (~HRESETn) begin
MSIP <= 0;
MTIME <= 0;
MTIMECMP <= 0;

14
wally-pipelined/src/csrc.sv
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@ -182,10 +182,9 @@ module csrc #(parameter
IllegalCSRCAccessM = 1;
end
endcase
end else
begin
IllegalCSRCAccessM = 1; // no privileges for this coute
CSRCReadValM = 0;
end else begin
IllegalCSRCAccessM = 1; // no privileges for this csr
CSRCReadValM = 0;
end
else // 32-bit counter reads
always_comb
@ -220,10 +219,9 @@ module csrc #(parameter
IllegalCSRCAccessM = 1;
end
endcase
end else
begin
IllegalCSRCAccessM = 1; // no privileges for this coute
CSRCReadValM = 0;
end else begin
IllegalCSRCAccessM = 1; // no privileges for this csr
CSRCReadValM = 0;
end
end else begin
assign CSRCReadValM = 0;

25
wally-pipelined/src/dtim.sv
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@ -26,24 +26,24 @@
`include "wally-config.vh"
module dtim (
input logic clk,
input logic [1:0] MemRWtim,
// input logic [7:0] ByteMaskM,
input logic [18:0] HADDR,
input logic HCLK, HRESETn,
input logic [1:0] MemRWtim,
input logic [18:0] HADDR,
input logic [`XLEN-1:0] HWDATA,
input logic HSELTim,
output logic [`XLEN-1:0] HREADTim,
output logic HRESPTim, HREADYTim
);
logic [`XLEN-1:0] RAM[0:65535];
logic [`XLEN-1:0] write;
// logic [`XLEN-1:0] write;
logic [15:0] entry;
logic memread, memwrite;
assign memread = MemRWtim[1];
assign memwrite = MemRWtim[0];
assign HRESPTim = 0; // OK
assign HREADYTim= 1; // Respond immediately; *** extend this
assign HREADYTim = 1; // Respond immediately; *** extend this
// word aligned reads
generate
@ -87,13 +87,16 @@ module dtim (
end
endgenerate */
generate
if (`XLEN == 64) begin
always_ff @(posedge clk)
if (`XLEN == 64)
always_ff @(posedge HCLK) begin
if (memwrite) RAM[HADDR[17:3]] <= HWDATA;
end else begin
always_ff @(posedge clk)
// HREADTim <= RAM[HADDR[17:3]];
end
else
always_ff @(posedge HCLK) begin
if (memwrite) RAM[HADDR[17:2]] <= HWDATA;
end
// HREADTim <= RAM[HADDR[17:2]];
end
endgenerate
endmodule

10
wally-pipelined/src/gpio.sv
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@ -28,7 +28,7 @@
`include "wally-config.vh"
module gpio (
input logic clk, reset,
input logic HCLK, HRESETn,
input logic [1:0] MemRWgpio,
input logic [7:0] HADDR,
input logic [`XLEN-1:0] HWDATA,
@ -75,8 +75,8 @@ module gpio (
default: HREADGPIO = 0;
endcase
end
always_ff @(posedge clk or posedge reset)
if (reset) begin
always_ff @(posedge HCLK or negedge HRESETn)
if (~HRESETn) begin
INPUT_EN <= 0;
OUTPUT_EN <= 0;
OUTPUT_VAL <= 0; // spec indicates synchronous reset (software control)
@ -96,8 +96,8 @@ module gpio (
default: HREADGPIO = 0;
endcase
end
always_ff @(posedge clk or posedge reset)
if (reset) begin
always_ff @(posedge HCLK or negedge HRESETn)
if (~HRESETn) begin
INPUT_EN <= 0;
OUTPUT_EN <= 0;
//OUTPUT_VAL <= 0;// spec indicates synchronous rset (software control)

3
wally-pipelined/src/uart.sv
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@ -28,7 +28,7 @@
`include "wally-config.vh"
module uart (
input logic clk, reset,
input logic HCLK, HRESETn,
input logic [1:0] MemRWuart,
input logic [2:0] HADDR,
input logic [`XLEN-1:0] HWDATA,
@ -79,6 +79,7 @@ module uart (
endgenerate
logic BAUDOUTb; // loop tx clock BAUDOUTb back to rx clock RCLK
// *** make sure reads don't occur on UART unless fully selected because they could change state. This applies to all peripherals
uartPC16550D u(.RCLK(BAUDOUTb), .*);
endmodule

42
wally-pipelined/src/uartPC16550D.sv
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@ -34,7 +34,7 @@
module uartPC16550D(
// Processor Interface
input logic clk, reset,
input logic HCLK, HRESETn,
input logic [2:0] A,
input logic [7:0] Din,
output logic [7:0] Dout,
@ -112,7 +112,7 @@ module uartPC16550D(
///////////////////////////////////////////
// Input synchronization: 2-stage synchronizer
///////////////////////////////////////////
always_ff @(posedge clk) begin
always_ff @(posedge HCLK) begin
{SINd, DSRbd, DCDbd, CTSbd, RIbd} <= {SIN, DSRb, DCDb, CTSb, RIb};
{SINsync, DSRbsync, DCDbsync, CTSbsync, RIbsync} <= loop ? {SOUTbit, ~MCR[0], ~MCR[3], ~MCR[1], ~MCR[2]} :
{SINd, DSRbd, DCDbd, CTSbd, RIbd}; // syncrhonized signals, handle loopback testing
@ -122,8 +122,8 @@ module uartPC16550D(
///////////////////////////////////////////
// Register interface (Table 1, note some are read only and some write only)
///////////////////////////////////////////
always_ff @(posedge clk, posedge reset)
if (reset) begin // Table 3 Reset Configuration
always_ff @(posedge HCLK, negedge HRESETn)
if (~HRESETn) begin // Table 3 Reset Configuration
IER <= 4'b0;
FCR <= 8'b0;
LCR <= 8'b0;
@ -184,8 +184,8 @@ module uartPC16550D(
// Unlike PC16550D, this unit is hardwired with same rx and tx baud clock
// *** add table of scale factors to get 16x uart clk
///////////////////////////////////////////
always_ff @(posedge clk, posedge reset)
if (reset) begin
always_ff @(posedge HCLK, negedge HRESETn)
if (~HRESETn) begin
baudcount <= 0;
baudpulse <= 0;
end else begin
@ -200,8 +200,8 @@ module uartPC16550D(
// receive timing and control
///////////////////////////////////////////
always_ff @(posedge clk, posedge reset)
if (reset) begin
always_ff @(posedge HCLK, negedge HRESETn)
if (~HRESETn) begin
rxoversampledcnt <= 0;
rxstate <= UART_IDLE;
rxbitsreceived <= 0;
@ -231,8 +231,8 @@ module uartPC16550D(
///////////////////////////////////////////
// receive shift register, buffer register, FIFO
///////////////////////////////////////////
always_ff @(posedge clk, posedge reset)
if (reset) rxshiftreg <= 0;
always_ff @(posedge HCLK, negedge HRESETn)
if (~HRESETn) rxshiftreg <= 0;
else if (rxcentered) rxshiftreg <= {rxshiftreg[8:0], SINsync}; // capture bit
assign rxparitybit = rxshiftreg[1]; // parity, if it exists, in bit 1 when all done
assign rxstopbit = rxshiftreg[0];
@ -253,8 +253,8 @@ module uartPC16550D(
assign rxbreak = rxframingerr & (rxdata9 == 9'b0); // break when 0 for start + data + parity + stop time
// receive FIFO and register
always_ff @(posedge clk, posedge reset)
if (reset) begin
always_ff @(posedge HCLK, negedge HRESETn)
if (~HRESETn) begin
rxfifohead <= 0; rxfifotail <= 0; rxdataready <= 0; RXBR <= 0;
end else begin
if (rxstate == UART_DONE) begin
@ -297,8 +297,8 @@ module uartPC16550D(
assign rxfifohaserr = |(rxerrbit & rxfullbit);
// receive buffer register and ready bit
always_ff @(posedge clk, posedge reset) // track rxrdy for DMA mode (FCR3 = FCR0 = 1)
if (reset) rxfifodmaready <= 0;
always_ff @(posedge HCLK, negedge HRESETn) // track rxrdy for DMA mode (FCR3 = FCR0 = 1)
if (~HRESETn) rxfifodmaready <= 0;
else if (rxfifotriggered | rxfifotimeout) rxfifodmaready <= 1;
else if (rxfifoempty) rxfifodmaready <= 0;
@ -316,8 +316,8 @@ module uartPC16550D(
///////////////////////////////////////////
// transmit timing and control
///////////////////////////////////////////
always_ff @(posedge clk, posedge reset)
if (reset) begin
always_ff @(posedge HCLK, negedge HRESETn)
if (~HRESETn) begin
txoversampledcnt <= 0;
txstate <= UART_IDLE;
txbitssent <= 0;
@ -364,8 +364,8 @@ module uartPC16550D(
end
// registers & FIFO
always_ff @(posedge clk, posedge reset)
if (reset) begin
always_ff @(posedge HCLK, negedge HRESETn)
if (~HRESETn) begin
txfifohead <= 0; txfifotail <= 0; txhrfull <= 0; txsrfull <= 0; TXHR <= 0; txsr <= 0;
end else begin
if (~MEMWb && A == 3'b000 && ~DLAB) begin // writing transmit holding register or fifo
@ -404,8 +404,8 @@ module uartPC16550D(
assign txfifofull = (txfifoentries == 4'b1111);
// transmit buffer ready bit
always_ff @(posedge clk, posedge reset) // track txrdy for DMA mode (FCR3 = FCR0 = 1)
if (reset) txfifodmaready <= 0;
always_ff @(posedge HCLK, negedge HRESETn) // track txrdy for DMA mode (FCR3 = FCR0 = 1)
if (~HRESETn) txfifodmaready <= 0;
else if (txfifoempty) txfifodmaready <= 1;
else if (txfifofull) txfifodmaready <= 0;
@ -440,7 +440,7 @@ module uartPC16550D(
intrpending = 0;
end
end
always @(posedge clk) INTR <= intrpending; // prevent glitches on interrupt pin
always @(posedge HCLK) INTR <= intrpending; // prevent glitches on interrupt pin
///////////////////////////////////////////
// modem control logic

15
wally-pipelined/src/uncore.sv
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@ -29,8 +29,8 @@
// *** need idiom to map onto cache RAM with byte writes
// *** and use memread signal to reduce power when reads aren't needed
module uncore (
input logic clk, reset,
// AHB Bus Interface
input logic HCLK, HRESETn,
input logic [31:0] HADDR,
input logic [`AHBW-1:0] HWDATAIN,
input logic HWRITE,
@ -72,10 +72,17 @@ module uncore (
// Enable read or write based on decoded address
assign MemRW = {~HWRITE, HWRITE};
assign MemRWtim = MemRW & {2{HSELTim}};
assign MemRWtim = MemRW & {2{HSELTim}};
assign MemRWclint = MemRW & {2{HSELCLINT}};
assign MemRWgpio = MemRW & {2{HSELGPIO}};
assign MemRWuart = MemRW & {2{HSELUART}};
assign MemRWgpio = MemRW & {2{HSELGPIO}};
assign MemRWuart = MemRW & {2{HSELUART}};
/* always_ff @(posedge HCLK) begin
HADDRD <= HADDR;
MemRWtim <= MemRW & {2{HSELTim}};
MemRWclint <= MemRW & {2{HSELCLINT}};
MemRWgpio <= MemRW & {2{HSELGPIO}};
MemRWuart <= MemRW & {2{HSELUART}};
end */
// subword accesses: converts HWDATAIN to HWDATA
subwordwrite sww(.*);

1
wally-pipelined/src/wallypipelinedhart.sv
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@ -37,6 +37,7 @@ module wallypipelinedhart (
// Bus Interface
input logic [`AHBW-1:0] HRDATA,
input logic HREADY, HRESP,
output logic HCLK, HRESETn,
output logic [31:0] HADDR,
output logic [`AHBW-1:0] HWDATA,
output logic HWRITE,

1
wally-pipelined/src/wallypipelinedsoc.sv
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@ -38,6 +38,7 @@ module wallypipelinedsoc (
input logic [`AHBW-1:0] HRDATAEXT,
input logic HREADYEXT, HRESPEXT,
// outputs to external memory, shared with uncore memory
output logic HCLK, HRESETn,
output logic [31:0] HADDR,
output logic [`AHBW-1:0] HWDATA,
output logic HWRITE,

1
wally-pipelined/testbench/testbench-imperas.sv
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@ -230,6 +230,7 @@ string tests32i[] = {
logic [3:0] HPROT;
logic [1:0] HTRANS;
logic HMASTLOCK;
logic HCLK, HRESETn;
// pick tests based on modes supported