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Sysnthesis failure with Vivado 2022.2 #16

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jeras opened this issue Dec 29, 2022 · 2 comments
Closed

Sysnthesis failure with Vivado 2022.2 #16

jeras opened this issue Dec 29, 2022 · 2 comments

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@jeras
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jeras commented Dec 29, 2022

ERROR: [Synth 8-91] ambiguous clock in event control [/home/izi/VLSI/ibex-demo-system/build/lowrisc_ibex_demo_system_0/src/lowrisc_ibex_demo_system_core_0/rtl/system/gpio.sv:43]

The offending code is https://github.com/lowRISC/ibex-demo-system/blob/main/rtl/system/gpio.sv#L44
If the line was not supposed to have a reset, it should be placed into a separate always block without the reset edge in the sensitivity list. The current code seems to imply using reset as a clock.

@GregAC
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GregAC commented Jan 3, 2023

Thanks for the report @jeras this will be addressed in #13 which adds needed synchronization to the GPIO as well.

@andreaskurth
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andreaskurth commented Jan 5, 2023

Closing as completed in #13. If the issue persists, please reopen.

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