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Can I trust it completely?When pins are auto assigned.

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75 sinfocia

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After my EPM7128LC84-6 was auto assigned pins ,I found that the 84th pin(INPUT/OE1) was assigned as a 'in' pin. The 1st pin(INPUT/GLCRn) and the second pin(INPUT/OE2) were 'GND'.What should i do,trust them or amend them? :oops:
 

mutoucanada

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75 sinfocia said:
After my EPM7128LC84-6 was auto assigned pins ,I found that the 84th pin(INPUT/OE1) was assigned as a 'in' pin. The 1st pin(INPUT/GLCRn) and the second pin(INPUT/OE2) were 'GND'.What should i do,trust them or amend them? :oops:
I think you should reassign the pins.
 

wjhzhx

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You should assign the pin according your CPLD's pin connection on the PCB, the software assigns these "INPUT/GLCRn) and the second pin(INPUT/OE2) were 'GND' " is that these pin is not used in your design, it is best to tie them to GND.
 

linuxluo

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Hi,
I think you can believe the auto place pin. And the result of auto is best normally than you place pin manually.
 

cbh1024

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FPGA Pin Assignment

One possible pin assignment method is to

1. First allow the FPGA software to route your initial design and give you a set of pin allocations.

2. Design your PCB based on this pin assignment and FIX this pin assignment so that any future iterations of resynthesis and P&R will not deviate much from this pin assignment.

Generally the pin assignment provided by the FPGA P&R tool is optimized for its P&R.

And of course reserve plenty of IOs to external connectors on your board in case you want to use extra signals.
 

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