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data_offload: Fix oneshot mode 

Signed-off-by: David Winter <david.winter@analog.com>
main
David Winter 2021-04-27 16:17:52 +02:00 committed by Mihaita Nagy
parent 66748510ea
commit 0af50d3f72
3 changed files with 31 additions and 11 deletions
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2
library/data_offload/data_offload.v
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@ -38,7 +38,7 @@ module data_offload #(
parameter ID = 0,
parameter [ 0:0] MEM_TYPE = 1'b0, // 1'b0 -FPGA RAM; 1'b1 - external memory
parameter [31:0] MEM_SIZE = 1023, // memory size in bytes -1 - max 16 GB
parameter [33:0] MEM_SIZE = 1023, // memory size in bytes -1 - max 16 GB
parameter MEMC_UIF_DATA_WIDTH = 512,
parameter MEMC_UIF_ADDRESS_WIDTH = 31,
parameter [31:0] MEMC_BADDRESS = 32'h00000000,

3
library/data_offload/data_offload_constr.ttcl
View File

@ -153,6 +153,9 @@ set_false_path \
set_false_path \
-to [get_pins -hierarchical * -filter {NAME=~*i_wr_init_req_sync/cdc_sync_stage1_reg[*]/D}]
set_false_path \
-to [get_pins -hierarchical * -filter {NAME=~*i_wr_oneshot_sync/cdc_sync_stage1_reg[*]/D}]
set_false_path \
-to [get_pins -hierarchical * -filter {NAME=~*/i_rd_last_address/cdc_sync_stage1_reg[*]/D}]

37
library/data_offload/data_offload_fsm.v
View File

@ -115,10 +115,11 @@ module data_offload_fsm #(
reg rd_isempty;
reg rd_init_req_d;
reg wr_init_req_d;
reg wr_ready_d;
// internal signals
wire wr_full;
wire wr_almost_full;
wire wr_init_req_s;
wire wr_init_req_pos_s;
wire wr_init_ack_s;
@ -135,6 +136,7 @@ module data_offload_fsm #(
wire rd_sync_internal_s;
wire wr_sync_external_s;
wire rd_sync_external_s;
wire wr_oneshot;
(* DONT_TOUCH = "TRUE" *) reg [1:0] wr_fsm_state = 2'b00;
(* DONT_TOUCH = "TRUE" *) reg [1:0] rd_fsm_state = 2'b00;
@ -181,7 +183,7 @@ module data_offload_fsm #(
end
WR_WRITE_TO_MEM: begin
if ((wr_full || wr_last) && wr_valid_out) begin
if ((wr_almost_full || wr_last) && wr_valid_out) begin
wr_fsm_state <= WR_WAIT_TO_END;
end else begin
wr_fsm_state <= WR_WRITE_TO_MEM;
@ -189,7 +191,7 @@ module data_offload_fsm #(
end
WR_WAIT_TO_END: begin
if ((wr_isempty_s) || (wr_init_req_pos_s)) begin
if (wr_isempty_s && (wr_oneshot || wr_init_req_s)) begin
wr_fsm_state <= WR_IDLE;
end else begin
wr_fsm_state <= WR_WAIT_TO_END;
@ -209,7 +211,8 @@ module data_offload_fsm #(
assign wr_init_req_pos_s = ~wr_init_req_d & wr_init_req_s;
// status bits
assign wr_full = (wr_addr == {{(WR_ADDRESS_WIDTH-1){1'b1}}, 1'b0}) ? 1'b1 : 1'b0;
assign wr_almost_full = (wr_addr == {{(WR_ADDRESS_WIDTH-1){1'b1}}, 1'b0}) ? 1'b1 : 1'b0;
assign wr_full = &wr_addr;
// generate INIT acknowledge signal in WRITE domain (in case of ADCs)
assign wr_init_ack_s = (wr_fsm_state == WR_SYNC) ? 1'b1 : 1'b0;
@ -253,10 +256,14 @@ module data_offload_fsm #(
end
end
end
always @(posedge wr_clk) begin
wr_ready_d <= wr_ready;
end
// flush out the DMA if the transfer is bigger than the storage size
assign wr_ready = ((wr_fsm_state == WR_WRITE_TO_MEM) ||
((wr_fsm_state == WR_WAIT_TO_END) && wr_valid_in)) ? 1'b1 : 1'b0;
((wr_fsm_state == WR_WAIT_TO_END) && wr_valid_in && wr_ready_d && wr_full)) ? 1'b1 : 1'b0;
// write control
assign wr_valid_out = (wr_fsm_state == WR_WRITE_TO_MEM) & wr_valid_in;
@ -282,7 +289,7 @@ module data_offload_fsm #(
case (rd_fsm_state)
RD_IDLE: begin
if ((rd_isfull_s) || (rd_wr_last_s)) begin
if (((!TX_OR_RXN_PATH) & rd_isfull_s) || (rd_wr_last_s)) begin
if (TX_OR_RXN_PATH) begin
rd_fsm_state <= RD_SYNC;
end else begin
@ -321,7 +328,7 @@ module data_offload_fsm #(
// read until empty or next init_req
RD_READ_FROM_MEM : begin
if ((rd_empty_s && rd_oneshot && rd_ready && rd_last) || (rd_init_req_neg_s)) begin
if ((rd_empty_s && (rd_init_req_s || (rd_oneshot && rd_last)) && rd_ready)) begin
rd_fsm_state <= RD_IDLE;
end else begin
rd_fsm_state <= RD_READ_FROM_MEM;
@ -354,7 +361,6 @@ module data_offload_fsm #(
end
// read address generation
assign rd_reading_s = (rd_fsm_state == RD_READ_FROM_MEM) ? 1'b1 : 1'b0;
always @(posedge rd_clk) begin
if (rd_fsm_state != RD_READ_FROM_MEM) begin
rd_addr <= 'b0;
@ -413,7 +419,7 @@ module data_offload_fsm #(
.ASYNC_CLK(1))
i_rd_full_sync (
.in_clk (wr_clk),
.in_event (wr_full),
.in_event (wr_almost_full),
.out_clk (rd_clk),
.out_event (rd_isfull_s)
);
@ -423,11 +429,22 @@ module data_offload_fsm #(
.ASYNC_CLK (1))
i_rd_wr_last_sync (
.in_clk (wr_clk),
.in_event ((wr_last & wr_valid_out)),
.in_event ((wr_last & wr_valid_in)),
.out_clk (rd_clk),
.out_event (rd_wr_last_s)
);
sync_bits #(
.NUM_OF_BITS (1),
.ASYNC_CLK (1))
i_wr_oneshot_sync (
.in_bits (rd_oneshot),
.out_clk (wr_clk),
.out_resetn (1'b1),
.out_bits (wr_oneshot)
);
sync_bits #(
.NUM_OF_BITS (1),
.ASYNC_CLK (1))