JAJSQ97J may 2009 – january 2021 XIO2001
PRODUCTION DATA
The bridge supports the transfer of data errors in both directions.
If a downstream PCI Express transaction with a data payload is received that targets the internal PCI bus and the EP bit is set indicating poisoned data, then the bridge must ensure that this information is transferred to the PCI bus. To do this, the bridge forces a parity error on each PCI bus data phase by inverting the parity bit calculated for each double-word of data.
If the bridge is the target of a PCI transaction that is forwarded to the PCI Express interface and a data parity error is detected, then this information is passed to the PCI Express interface. To do this, the bridge sets the EP bit in the upstream PCI Express header.