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fpga: rfnoc: radio: Improve underflow handling

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The TX radio will normally transmit a late not-timed packet when an
underflow occurs between packets within a burst. However, if it was
only one cycle late, then the packet would be dropped. This change
rearms the state machine more quickly in this corner case to allow
this late packet to be accepted. The underflow error will still be
reported.


Original-commit: 9faac6597cf21ca11e40d4e98797cea2848c40b0
This commit is contained in:
Wade Fife
2025-02-07 08:56:18 -06:00
parent 4d5cad3310
commit 285f7b26a1
1 changed files with 4 additions and 7 deletions
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lib/rfnoc/blocks/rfnoc_block_radio/radio_tx_core.v
+4 -7
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@@ -355,7 +355,9 @@ module radio_tx_core #(
new_error_code <= ERR_TX_UNDERRUN;
new_error_time <= radio_time;
new_error_valid <= 1'b1;
state <= ST_POLICY_WAIT;
// If we're between packets, go straight to IDLE. Otherwise, drop
// the rest of the packet before returning to IDLE.
state <= sop ? ST_IDLE : ST_POLICY_WAIT;
end else if (s_axis_tlast && s_axis_teob) begin
// We're done with this burst of packets, so acknowledge EOB and
// go back to idle.
@@ -395,11 +397,6 @@ module radio_tx_core #(
(reg_policy == TX_ERR_POLICY_BURST && s_axis_teob)) begin
state <= ST_IDLE;
end
// If we came from ST_TRANSMIT and we happen to already be between
// packets (i.e., we underflowed while waiting for the next packet).
end else if (!s_axis_tvalid && sop) begin
if (reg_policy == TX_ERR_POLICY_PACKET) state <= ST_IDLE;
end
end
@@ -448,7 +445,7 @@ module radio_tx_core #(
.reset (radio_rst),
.clear (1'b0),
.i_tdata ({new_error_time, new_error_code}),
.i_tvalid (new_error_valid & new_error_ready), // Mask with ready to prevent FIFO corruption
.i_tvalid (new_error_valid),
.i_tready (new_error_ready),
.o_tdata ({next_error_time, next_error_code}),
.o_tvalid (next_error_valid),