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rtl: update accum to support window_size < 3

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Phil
2026-06-26 18:39:33 +03:00
parent 02416a9621
commit 425c922690
1 changed files with 109 additions and 40 deletions
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153
rtl/accum/src/accum.sv
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@ -112,11 +112,23 @@ module accumulator
seq_num_reg <= '0; seq_num_reg <= '0;
cnt_seq_num <= '0; cnt_seq_num <= '0;
cnt_addr <= '0; cnt_addr <= '0;
addra <= '0;
addrb <= '0;
data_bram_in <= '0;
wea <= 0; wea <= 0;
enb <= 0; enb <= 0;
wr_state <= IDLE; wr_state <= IDLE;
finish_reg <= 0; finish_reg <= 0;
finish_buf <= 0;
readout_begin_reg <= 0;
out_data_reg <= '0;
out_valid_reg <= 0; out_valid_reg <= 0;
accum_pipe_valid <= 0;
accum_pipe_addr <= '0;
accum_pipe_data <= '0;
accum_pipe_bypass_valid <= 0;
accum_pipe_bypass_data <= '0;
accum_done <= 0;
end else begin end else begin
finish_buf <= finish; finish_buf <= finish;
@ -130,6 +142,13 @@ module accumulator
readout_begin_reg <= 0; readout_begin_reg <= 0;
finish_reg <= 0; finish_reg <= 0;
out_valid_reg <= 0; out_valid_reg <= 0;
accum_pipe_valid <= 0;
accum_pipe_bypass_valid <= 0;
accum_done <= 0;
cnt_smp_num <= '0;
cnt_seq_num <= '0;
cnt_addr <= '0;
addrb <= '0;
if (start) begin if (start) begin
smp_num_reg <= smp_num; smp_num_reg <= smp_num;
seq_num_reg <= seq_num; seq_num_reg <= seq_num;
@ -137,76 +156,122 @@ module accumulator
end end
end end
INIT_MEM: begin INIT_MEM: begin
// first run to initialize memory with first batch of values // First sequence
wea <= 0; wea <= 0;
enb <= 0;
out_valid_reg <= 0;
accum_pipe_valid <= 0;
accum_pipe_bypass_valid <= 0;
accum_done <= 0;
if (valid_data) begin if (valid_data) begin
// mem_wea/mem_addra/mem_dina do the actual write in this clock
data_bram_in <= data; data_bram_in <= data;
addra <= cnt_addr; addra <= cnt_addr;
wea <= 1; wea <= 1;
cnt_addr <= cnt_addr + 1;
cnt_smp_num <= cnt_smp_num + WINDOW_SIZE;
end if (cnt_smp_num + WINDOW_SIZE >= smp_num_reg) begin
if (cnt_smp_num >= smp_num_reg) begin cnt_smp_num <= '0;
wr_state <= BEGIN_SEQ; cnt_addr <= '0;
end
end if (seq_num_reg <= 16'd1) begin
BEGIN_SEQ: begin
// start new acc seq
wea <= 0;
enb <= 0;
if (cnt_seq_num == seq_num_reg - 1) begin
cnt_seq_num <= '0; cnt_seq_num <= '0;
cnt_smp_num <= '0;
cnt_addr <= '0;
wr_state <= READOUT_START;
addrb <= '0; addrb <= '0;
enb <= 0; wr_state <= READOUT_START;
end else begin end else begin
// beginning of new data sequence // start further accumulation
cnt_seq_num <= cnt_seq_num + 1; cnt_seq_num <= 16'd1;
cnt_smp_num <= '0; wr_state <= ACCUM;
cnt_addr <= '0;
wea <= 0;
addrb <= 0;
wr_state <= REQ_WORD_B;
end end
end else begin
cnt_smp_num <= cnt_smp_num + WINDOW_SIZE;
cnt_addr <= cnt_addr + 1;
end
end
end
BEGIN_SEQ: begin
// FIXME: unused
wea <= 0;
enb <= 0;
wr_state <= ACCUM;
end end
REQ_WORD_B: begin REQ_WORD_B: begin
// pre-request data for port b // FIXME: depr
wea <= 0; wea <= 0;
enb <= 1; enb <= 0;
addrb <= cnt_addr;
wr_state <= ACCUM; wr_state <= ACCUM;
end end
ACCUM: begin ACCUM: begin
// sum mem+input // accum pipeline
wea <= 0;
enb <= 0; enb <= 0;
if (valid_data) begin out_valid_reg <= 0;
addra <= cnt_addr;
if (accum_pipe_valid) begin
// mem_wea/mem_addra/mem_dina do the actual write this clock
addra <= accum_pipe_addr;
data_bram_in <= accum_write_value;
wea <= 1; wea <= 1;
data_bram_in <= data + data_bram_out; end
cnt_smp_num <= cnt_smp_num + WINDOW_SIZE;
if (cnt_smp_num + WINDOW_SIZE >= smp_num_reg) begin if (accum_done) begin
wr_state <= BEGIN_SEQ; // Last input word was accepted on the previous clk
accum_pipe_valid <= 0;
accum_pipe_bypass_valid <= 0;
cnt_smp_num <= '0;
cnt_seq_num <= '0;
cnt_addr <= '0;
addrb <= '0;
enb <= 0;
wr_state <= READOUT_START;
end else if (valid_data) begin
// mem_enb/mem_addrb launch the actual read this clock
enb <= 1;
addrb <= cnt_addr;
accum_pipe_valid <= 1;
accum_pipe_addr <= cnt_addr;
accum_pipe_data <= data;
// case window_size=1 && smp_num is small
accum_pipe_bypass_valid <= accum_pipe_valid && (accum_pipe_addr == cnt_addr);
accum_pipe_bypass_data <= accum_write_value;
if (accum_accept_last) begin
cnt_smp_num <= '0;
cnt_addr <= '0;
if (cnt_seq_num == seq_num_reg - 1) begin
accum_done <= 1;
end else begin end else begin
cnt_seq_num <= cnt_seq_num + 1;
end
end else begin
cnt_smp_num <= cnt_smp_num + WINDOW_SIZE;
cnt_addr <= cnt_addr + 1; cnt_addr <= cnt_addr + 1;
wr_state <= REQ_WORD_B; end
end end else begin
accum_pipe_valid <= 0;
accum_pipe_bypass_valid <= 0;
end end
end end
READOUT_START: begin READOUT_START: begin
readout_begin_reg <= 1'b1; readout_begin_reg <= 1'b1;
wr_state <= READOUT_AWAIT; wr_state <= READOUT_AWAIT;
enb <= 0; enb <= 0;
wea <= 0;
end end
READOUT_AWAIT: begin READOUT_AWAIT: begin
// req await + delay for every-clock readout. // req await + delay for every-clock readout
wea <= 0;
if (batch_req) begin if (batch_req) begin
enb <= 1; enb <= 1;
wr_state <= READOUT_DELAY; wr_state <= READOUT_DELAY;
@ -220,12 +285,14 @@ module accumulator
READOUT_DELAY: begin READOUT_DELAY: begin
// wait for mem latency // wait for mem latency
wea <= 0;
addrb <= addrb + 1; addrb <= addrb + 1;
wr_state <= READOUT_PUT; wr_state <= READOUT_PUT;
end end
READOUT_PUT: begin READOUT_PUT: begin
// main data output // main data output
wea <= 0;
if ((addrb % READ_BATCH_SIZE) == 0) begin if ((addrb % READ_BATCH_SIZE) == 0) begin
wr_state <= READOUT_LAST; wr_state <= READOUT_LAST;
enb <= 0; enb <= 0;
@ -237,6 +304,7 @@ module accumulator
READOUT_LAST: begin READOUT_LAST: begin
// last word of packet // last word of packet
wea <= 0;
out_valid_reg <= 0; out_valid_reg <= 0;
out_data_reg <= data_bram_out; out_data_reg <= data_bram_out;
wr_state <= READOUT_START; wr_state <= READOUT_START;
@ -245,6 +313,7 @@ module accumulator
FINISH: begin FINISH: begin
out_valid_reg <= 0; out_valid_reg <= 0;
enb <= 0; enb <= 0;
wea <= 0;
wr_state <= IDLE; wr_state <= IDLE;
end end
@ -301,14 +370,14 @@ module accumulator
.doutb(data_bram_out), .doutb(data_bram_out),
.addra(addra), .addra(mem_addra),
.addrb(addrb), .addrb(mem_addrb),
.clka(clk_in), .clka(clk_in),
.clkb(clk_in), .clkb(clk_in),
.dina(data_bram_in), .dina(mem_dina),
.ena(1'b1), .ena(1'b1),
.enb(enb), .enb(mem_enb),
.wea(wea) .wea(mem_wea)
); );
assign readout_begin = readout_begin_reg; assign readout_begin = readout_begin_reg;