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Ensure that HSIZE is flopped and that data is shifted according to HADDR/HSIZE

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This commit is contained in:
Dennis Potter 2021-10-03 23:22:54 -07:00
parent aada5c5853
commit c4dca87ab5
Signed by: Dennis
GPG Key ID: 186A8AD440942BAF
1 changed files with 27 additions and 13 deletions
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40
srdl2sv/components/widgets/srdl2sv_amba3ahblite.sv
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@ -96,7 +96,8 @@ module srdl2sv_amba3ahblite
/****************************
* Determine current address
****************************/
logic [31:0] addr_q;
logic [31:0] HADDR_q;
logic [2:0] HSIZE_q;
OP_t operation_q;
wire addr_err = HADDR % (32'b1 << HSIZE) != 32'b0;
@ -112,16 +113,18 @@ module srdl2sv_amba3ahblite
// of extending the address phase of the next transfer
if (HREADYOUT)
begin
// Floor address. Sub-register access will be handled by byte-enables
addr_q <= {HADDR[31:BUS_BYTES_W], {BUS_BYTES_W{1'b0}}};
HADDR_q <= HADDR;
HSIZE_q <= HSIZE;
operation_q <= HWRITE ? WRITE : READ;
end
end
SEQ:
begin
if (HREADYOUT)
// Floor address. Sub-register access will be handled by byte-enables
addr_q <= {HADDR[31:BUS_BYTES_W], {BUS_BYTES_W{1'b0}}};
begin
HADDR_q <= HADDR;
HSIZE_q <= HSIZE;
end
end
endcase
end
@ -129,14 +132,25 @@ module srdl2sv_amba3ahblite
/****************************
* Statemachine
****************************/
fsm_t fsm_next, fsm_q;
logic [BUS_BITS-1:0] HRDATA_temp;
fsm_t fsm_next, fsm_q;
always_comb
begin
// Defaults
HREADYOUT = 1'b1;
HRESP = 1'b0;
HRDATA = r2b.data;
// When reading back, the data of the bit that was accessed over the bus
// should be at byte 0 of the HRDATA bus and bits that were not accessed
// should be masked with 0s.
HRDATA_temp = r2b.data >> (8*HADDR_q[BUS_BYTES_W-1:0]);
for (int i = 0; i < BUS_BYTES; i++)
if (i < (1 << HSIZE_q))
HRDATA[8*(i+1)-1 -: 8] = HRDATA_temp[8*(i+1)-1 -: 8];
else
HRDATA[8*(i+1)-1 -: 8] = 8'b0;
b2r_w_vld_next = 0;
b2r_r_vld_next = 0;
@ -245,10 +259,10 @@ module srdl2sv_amba3ahblite
always_comb
begin
for (int i = 0; i < BUS_BYTES; i++)
HSIZE_bitfielded[i] = i < (1 << HSIZE);
HSIZE_bitfielded[i] = i < (1 << HSIZE_q);
// Shift if not the full bus is accessed
b2r_byte_en_next = HSIZE_bitfielded << (HADDR % BUS_BYTES);
b2r_byte_en_next = HSIZE_bitfielded << (HADDR_q % BUS_BYTES);
end
/***
@ -271,8 +285,8 @@ module srdl2sv_amba3ahblite
always_ff @ (posedge HCLK)
begin
b2r.addr <= addr_q;
b2r.data <= HWDATA << HADDR[BUS_BYTES_W-1:0];
b2r.addr <= {HADDR_q[31:BUS_BYTES_W], {BUS_BYTES_W{1'b0}}};
b2r.data <= HWDATA << (8*HADDR_q[BUS_BYTES_W-1:0]);
b2r.byte_en <= b2r_byte_en_next;
end
end
@ -280,8 +294,8 @@ module srdl2sv_amba3ahblite
begin
assign b2r.w_vld = b2r_w_vld_next;
assign b2r.r_vld = b2r_r_vld_next;
assign b2r.addr = addr_q;
assign b2r.data = HWDATA << HADDR[BUS_BYTES_W-1:0];
assign b2r.addr = {HADDR_q[31:BUS_BYTES_W], {BUS_BYTES_W{1'b0}}};
assign b2r.data = HWDATA << (8*HADDR_q[BUS_BYTES_W-1:0]);
assign b2r.byte_en = b2r_byte_en_next;
end
endgenerate