Author: matt
Date: 2007-07-05 18:51:12 -0600 (Thu, 05 Jul 2007)
New Revision: 5917
Modified:
gnuradio/branches/developers/matt/u2f/control_lib/fifo_int.v
Log:
shorten critical path by asserting enable even when not needed
Modified: gnuradio/branches/developers/matt/u2f/control_lib/fifo_int.v
===================================================================
--- gnuradio/branches/developers/matt/u2f/control_lib/fifo_int.v
2007-07-06 00:49:26 UTC (rev 5916)
+++ gnuradio/branches/developers/matt/u2f/control_lib/fifo_int.v
2007-07-06 00:51:12 UTC (rev 5917)
@@ -46,7 +46,6 @@
assign dat_to_buf = wr_dat_i;
assign rd_dat_o = dat_from_buf;
- assign en_o = rd_en | wr_en;
localparam IDLE = 3'd0;
localparam PRE_READ = 3'd1;
@@ -114,17 +113,20 @@
endcase // case(state)
- // FIXME read side ignores rd_done_i for now
+ // FIXME read side ignores rd_done_i and step for now
- assign rd_en = (state == PRE_READ) || ((state == READING) && rd_read_i);
+ assign rd_en = (state == PRE_READ) || ((state == READING) && rd_read_i); //
unused now
assign rd_empty_o = (state != READING) && (state != PRE_READ);
assign rd_ready_o = (state == READING);
-
- assign wr_en = (state == WRITING) && wr_write_i; // IF this is a timing
problem, we could always enable when in this state
+
+ assign wr_en = (state == WRITING) && wr_write_i; // unused now IF this is
a timing problem, we could always enable when in this state
assign we_o = (state == WRITING) && wr_write_i; // IF this is a timing
problem, we could always write when in this state
assign wr_full_o = (state != WRITING);
assign wr_ready_o = (state == WRITING);
+ //assign en_o = rd_en | wr_en;
+ assign en_o = ~((state==READING)& ~rd_read_i); // test faster signal
+
assign done = (state == IDLE);
assign error = (state == ERROR);
endmodule // fifo_int
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