How many bytes in a burst? Does it go by bytes or data phase?
The number of bytes can be any size. The answer depends on the PCI device and the PCI bridge. PCI supports variable size bursts. Existing Sun systems will disconnect at 64 byte boundaries. Chips designed and supported by Sun will burst at 64 bytes. Bursting for the device is controlled by the latency timer and cache line size registers in the devices configuration header block.
