47.6.3.5 Interrupt Interface Block

The Interrupt Interface (INTIF) block performs a low-priority polling algorithm of each of the HBI channel descriptors.

The INTIF alerts the HBI block when specific changes to HBI Channel Descriptors occur.

• For asynchronous and control read/write channels:
  • a packet is available to read in the channel buffer, or
  • sufficient empty space is available in the channel buffer to accept a requested packet write.
• For isochronous read/write channels:
  • the number of valid bytes in the channel buffer exceeds the block size, or
  • the number of empty bytes in the channel buffer exceeds the block size.