From cb6afea07c87293fb4c0e0bc7080b3de28c7f39e Mon Sep 17 00:00:00 2001 From: Xifan Tang Date: Wed, 25 Mar 2020 16:00:25 -0600 Subject: [PATCH] update documentation on a new option in FPGA-SDC to constrain zero-delay paths --- docs/source/openfpga_shell/openfpga_commands.rst | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/docs/source/openfpga_shell/openfpga_commands.rst b/docs/source/openfpga_shell/openfpga_commands.rst index fd44f6fbb..8f71cdb54 100644 --- a/docs/source/openfpga_shell/openfpga_commands.rst +++ b/docs/source/openfpga_shell/openfpga_commands.rst @@ -191,6 +191,10 @@ FPGA-SDC - ``--constrain_routing_multiplexer_outputs`` Constrain all the outputs of routing multiplexer of FPGA fabric - ``--constrain_switch_block_outputs`` Constrain all the outputs of switch blocks of FPGA fabric + + - ``--constrain_zero_delay_paths`` Constrain all the zero-delay paths in FPGA fabric + + .. note:: Zero-delay path may cause errors in some PnR tools as it is considered illegal - ``--verbose`` Enable verbose output