Figure 7-12.Destination Address Communication; Figure 7-13.Protocol Channel Communication; Multiprocessor Mode Overview - Lucent Technologies DSP1617 Information Manual

DSP1611/17/18/27/28/29 DIGITAL SIGNAL PROCESSOR
Serial I/O
7.6 Multiprocessor Mode Description
7.6.1 Multiprocessor Mode Overview (continued)

The receiving DSP(s) need to know which data is intended for them. This information is contained in a serial
address sent on the ADD line in each time slot. This is called the transmit address because it is stored in the
transmitting DSP's srta register. The same number will be stored in the receiving DSP's srta register and called
the receive address. The address is generally called the destination address. This 8-bit address is transmitted
serially on ADD at the same time as the first 8 bits of the data.
SRTA REG.
RECEIVE ADDR.

The receiving DSP might need to know which DSP the data came from and possibly other information about the
data. This is contained in the second 8 bits of each time slot on the ADD bus. This information is called the pro-
tocol channel and is stored in the saddx register. The transmitting DSP can send its unique source address and
possibly other information describing the data.
saddx
15
7-16
(continued)
TRANSMITTING DSP
TRANS. ADDR.
0010000
DATA ADD
Figure 7-12. Destination Address Communication
Figure 7-13
TRANSMITTING DSP
PROTOCOL
INFO.
7
8 0
ADD
Figure 7-13. Protocol Channel Communication
DRAFT COPY
Figure 7-12 illustrates this concept.
RECEIVING DSP
SRTA REG
RECEIVE ADDR. TRANS. ADDR.
0010000
YES
COMPARE ? READ DATA
ADD DATA
shows this case.
RECEIVING DSP
saddx
15 8 7
ADD
Information Manual
April 1998
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Lucent Technologies Inc.