Dear Sir ,
we are developing controller base on 28376S Chip , and using SPI communication + RS422 trancivers to communicate with extreanl end equipment
1. we recentaly came acrros endequipment that requires from us to work in SPI frequency of ~8Mbps , the 28376S by iteslef can generate such frequency
but due to propregation delay of the RS422 trancivers , it is not possiable
2.on 28376S the Setup delay of SPISOMI is 20ns while in high speed mode Setup time is 5ns , but there are also hold time of 5ns'
is it possiable to switch to High Speed SPI mode from Normal mode , even tough the GPIOs that are used is not meant for High Speed SPI ?
the purpose is just to shorten the setup time from 20ns to samller vlaue , without incresing the frequency (max 8Mbps)