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BF523 HOST Port interface(HOSTDP)

Question asked by wallman16 on Feb 14, 2012
Latest reply on Feb 14, 2012 by CraigG

Hi,


I have a issue with regards BF523 HOST Port interface(HOSTDP).

We are trying data transfer from host Device and blackfin and we find that the
Host access and the Blackfin response is not matching with the working .
This is same with both Acknowledge and Interrupt mode

1. Read from HOST device (16 words) and we find that Blackfin doesn't finish
the read . But if we do this for a number of times we find the Blacfin
completes the operation

2. Write to HOST device (16 words)from Blackfin and we find that Blackfin
doesn't finish the write . But if we do this for a number of times we find the
Blacfin completes the operation

3. Read from HOST device (16 words) and we find that Blackfin doesn't finish
the read and the FIFO EMPTY flag is not set

This working depends on the HOST Devices condition and there are times when it works .
Please let me know if there are any point to be taken care of .

In Acknowledge mode ,
Can we work around the HRDY wait , by checking the FIFO FULL or FIFO EMPTY bit
in HOSTDP STATUS Register .

In the Interrupt mode ,
After the state of HRDY goes from H-> L , During the data read/ write will
the HRDY hold the H state always .
In the application note EE-337 we find the on the 2 Word access it is High but
after the data transfer we find it is L .

Could you please let me know with regards to this issue .

Thanking you
With best regards and wishes

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