1 files changed, 4 insertions, 0 deletions

diff --git a/hdl/jtag_uart.sv b/hdl/jtag_uart.sv
index ad4665e..c297811 100644
--- a/hdl/jtag_uart.sv
+++ b/hdl/jtag_uart.sv
@@ -75,7 +75,11 @@ always_ff @(posedge clk) begin
             $write("%s", tx_b_data);
             tx_b_valid = 0;
         end
+`ifdef JTAG_UART_FAST
         tx_ready = !tx_b_valid;
+`else
+        tx_ready = !tx_b_valid && !tx_ready && `tx_valid;
+`endif
     end
 end