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crosslink_nx_evn: Improve documentation on UART jumpers 

Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2020-09-05 09:58:28 +01:00
parent 76ac4a69a8
commit 8a9fd02768
2 changed files with 3 additions and 2 deletions
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3
litex_boards/platforms/crosslink_nx_evn.py
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@ -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")),

2
litex_boards/targets/crosslink_nx_evn.py
View File

@ -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)