[fpga] Route UART Tx to second pin on ChipWhisperer board for debugging
On the ChipWhisperer FPGA board, the UART is connected to the capture
board and used for transfering input and output data. This commit adds a
second UART Tx pin to allow debugging before capturing traces.
Signed-off-by: Pirmin Vogel <vogelpi@lowrisc.org>
diff --git a/hw/top_earlgrey/data/pins_cw305.xdc b/hw/top_earlgrey/data/pins_cw305.xdc
index 854f901..9b35469 100644
--- a/hw/top_earlgrey/data/pins_cw305.xdc
+++ b/hw/top_earlgrey/data/pins_cw305.xdc
@@ -47,6 +47,10 @@
set_property -dict { PACKAGE_PIN D16 IOSTANDARD LVCMOS33 } [get_ports { IO_USB_SENSE0 }]; #JP3.D16
set_property -dict { PACKAGE_PIN E16 IOSTANDARD LVCMOS33 } [get_ports { IO_USB_DNPULLUP0 }]; #JP3.E16
+set_property -dict { PACKAGE_PIN G16 IOSTANDARD LVCMOS33 } [get_ports { IO_UTX_DEBUG }]; #JP3.G16 (UART) for debugging
+
+## Unused pins of JP3: A12, B12, F12
+
## 20-Pin Connector (JP1)
set_property -dict { PACKAGE_PIN R16 IOSTANDARD LVCMOS33 } [get_ports { IO_UTX }]; #JP1 PIN 10 (UART)
diff --git a/hw/top_earlgrey/rtl/top_earlgrey_cw305.sv b/hw/top_earlgrey/rtl/top_earlgrey_cw305.sv
index 561313f..873b054 100644
--- a/hw/top_earlgrey/rtl/top_earlgrey_cw305.sv
+++ b/hw/top_earlgrey/rtl/top_earlgrey_cw305.sv
@@ -45,8 +45,9 @@
inout IO_GP13,
inout IO_GP14,
inout IO_GP15,
- // chipwhisperer IO
- output TIO_CLKOUT
+ // ChipWhisperer IO
+ output TIO_CLKOUT,
+ output IO_UTX_DEBUG
);
import top_earlgrey_pkg::*;
@@ -66,8 +67,6 @@
logic [padctrl_reg_pkg::NDioPads-1:0] dio_oe_core, dio_oe_padring;
logic [padctrl_reg_pkg::NDioPads-1:0] dio_in_core, dio_in_padring;
- assign TIO_CLKOUT = IO_CLK;
-
padring #(
// MIOs 31:20 are currently not
// connected to pads and hence tied off
@@ -309,4 +308,14 @@
end
end
+ //////////////////////
+ // ChipWhisperer IO //
+ //////////////////////
+
+ // Clock ouput to capture board.
+ assign TIO_CLKOUT = IO_CLK;
+
+ // UART Tx for debugging. The UART itself is connected to the capture board.
+ assign IO_UTX_DEBUG = top_earlgrey.cio_uart_tx_d2p;
+
endmodule : top_earlgrey_cw305
