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Overview
7-6
The HPI ready pin (HRDY) allows insertion of host wait states. Wait states may
be necessary, depending on latency to the point in the memory map accessed
via the HPI, as well as on the rate of host access. The rate of host access can
force not-ready conditions if the host attempts to access the host port before any
previous HPID write access or prefetched HPID read access finishes. In this
case, the HPI simply holds off the host via HRDY. HRDY provides a convenient
way to automatically adjust the host access rate to the rate of data delivery from
the DMA auxiliary channel (no software handshake is needed). In the cases of
hardware systems that cannot take advantage of the HRDY pin, an HRDY bit
in the HPIC is available for use as a software handshake.
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