8xx bus monitoring

Robin Gilks robin.gilks at tait.co.nz
Wed Jan 26 13:31:48 EST 2005


System is a MPC859 based controller.

I'm trying to determine whether a peripheral is not responding to memory 
fetches by using the bus monitor feature on the Transfer Acknowledge 
(TA) signal. This is set to the maximum count in the Bus Monitor Timeout 
(BMT) in the System Protect Control Register (SYPCR). The monitoring is 
enabled by setting the Bus Monitor Enable (BME) bit in SYPCR as well.

I understand that I can use the Transfer Error Status Register (TESR) to 
read the fact that I have had a timeout by checking the Data Transfer 
Monitor Timeout (DTMT) bit in this register.

The problem is, how do I know any error has occured so I know to look at 
  the TESR. I can't see a way of generating an exception from this 

Any help appreciated.

Robin Gilks
Senior Design Engineer          Phone: (+64)(3) 357 1569
Tait Electronics                Fax  :  (+64)(3) 359 4632
PO Box 1645 Christchurch        Email : robin.gilks at tait.co.nz
New Zealand

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