Sundance SMT6025 v.2.9 - Manual (Page 21)

Version 2.9 Page 21 of 45 SMT6025 User Manual
15 High speed channel
A High-speed channel (HSC) is a powerful and simple way for the host and root
DSP to communicate. The SMT6025 provides 8 “High Speed Channels”.
15.1 Introduction
Communication across the HSC is always initiated by the DSP. The DSP
sends a control word, along with any associated data, to the host’s channel
handler, which performs some resulting action and replies with a reply word and
associated data. This is shown in the following diagram.
Send command word
DSP HOST
Send associated data
Read reply word
Read associated data
TI
M
E
Read command word
Read associated data
Perform required
operation
Write associated data
Write reply word
Channel handler
Figure 7 - Standard HSC transaction
Each of the 8 HSC channels has an associated channel handler on the host.
The channel handler is responsible for acting on behalf of the DSP as shown in
Figure 7. There is a standard handler associated with each channel by default,
but the DSP can replace this with a user-defined handler.
User Manual (QCF42); Version 2.9, 22/02/02; © Sundance Multiprocessor Technology Ltd. 2002