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.