DM648 - PCI to multiple devices

Following is a response from a PCI engineer:

You can have a look at PCI UG like http://www.ti.com/lit/ug/spru581c/spru581c.pdf that has a section (8.3) on DSP as system host. Note that DM6467/DM648 can configure itself via the back-end registers and does not need to configure itself over the bus the way early devices did.

You should also look at the PCI-SIG spec to be sure they are proving all of the required central resources: clock, command bus pull-ups, arbitration, IDSEL generation, etc.

There’s an DM6467 appnote on how to use standalone arbiters in multi-master setups: http://www.ti.com/lit/an/sprab28/sprab28.pdf, the same can be used as a reference for DM648.

 Incoming interrupts will need to be connected to a GPIO or similar pin on the host DM648 that can cause an interrupt on the DSP.

Regards, Srirami.