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NMSI mode support for transparent protocol in  QE

Question asked by Amanaganti VinodKumar on Jan 6, 2016
Latest reply on Jan 11, 2016 by Amanaganti VinodKumar

Hi All,

 

We are trying to implement V.35 protocol in our ISDN Gateway product, the purpose is to make a ISDN video call over the V.35 interface . We are using P1021 processor, initially we tried to use existing UCC_UART driver (in synchronous mode) and GPIO lines as control leads(cts, rts) instead of hardware flow control. Control signals handshake is happening properly and call is getting connected to the other end point, but we are facing issues in data path, while debugging it, we found that V.35 protocol doesn't use start and stop bits in the data stream. But our UART driver is working based on start and stop bits mechanism. Hence we could not proceed further with UART driver to solve the data integrity issues.

 

After reading the QE datasheet, we understand that we can accomplish data path by configuring UCC in fast protocol, with transparent mode using NMSI.

We have basically following doubts in this approach

 

1) Is it possible to implement V.35 protocol using UCC in fast protocol, transparent mode with NMSI ?

2) Will clock(tx/rx) and data(tx/rx) signals compatible issues arise, if we change UCC from UART mode to transparent NMSI mode ?

2) Is there any sample driver to access data in transparent mode with NMSI configuration ?

3) Can we control the RTS, CTS signals manually in this NMSI configuration?

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