From 8a9fd02768dff6c6dbd699662f2d8d52cecc7953 Mon Sep 17 00:00:00 2001 From: David Shah Date: Sat, 5 Sep 2020 09:58:28 +0100 Subject: [PATCH] crosslink_nx_evn: Improve documentation on UART jumpers Signed-off-by: David Shah --- litex_boards/platforms/crosslink_nx_evn.py | 3 ++- litex_boards/targets/crosslink_nx_evn.py | 2 +- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/litex_boards/platforms/crosslink_nx_evn.py b/litex_boards/platforms/crosslink_nx_evn.py index 099a060..e0440e8 100644 --- a/litex_boards/platforms/crosslink_nx_evn.py +++ b/litex_boards/platforms/crosslink_nx_evn.py @@ -25,7 +25,8 @@ _io = [ ("user_btn", 1, Pins("G15"), IOStandard("LVCMOS33")), # SW3 # Section 6.2 UART Topology - # Requires installation of 0-ohm jumpers to properly route signals + # Requires installation of 0-ohm jumpers R15 and R17 to properly route signals + # Note that it is R15 and R17, not R16 and R17 as stated in the user guide ("serial", 0, Subsignal("rx", Pins("F16"), IOStandard("LVCMOS33")), Subsignal("tx", Pins("F18"), IOStandard("LVCMOS33")), diff --git a/litex_boards/targets/crosslink_nx_evn.py b/litex_boards/targets/crosslink_nx_evn.py index 6158512..f01911c 100755 --- a/litex_boards/targets/crosslink_nx_evn.py +++ b/litex_boards/targets/crosslink_nx_evn.py @@ -99,7 +99,7 @@ def main(): parser.add_argument("--build", action="store_true", help="Build bitstream") parser.add_argument("--load", action="store_true", help="Load bitstream") parser.add_argument("--sys-clk-freq", default=75e6, help="System clock frequency (default=75MHz)") - parser.add_argument("--serial", default="serial", help="UART Pins: serial or serial_pmod[0-2] (default=serial)") + parser.add_argument("--serial", default="serial", help="UART Pins: serial (requires R15 and R17 to be soldered) or serial_pmod[0-2] (default=serial)") parser.add_argument("--prog-target", default="direct", help="Programming Target: direct or flash") builder_args(parser) soc_core_args(parser)