Serial Interface #2; Sio2 Features; Figure 7-18.Sio2-Pio/Phif Multiplexing - Lucent Technologies DSP1617 Information Manual

DSP1611/17/18/27/28/29 DIGITAL SIGNAL PROCESSOR
Serial I/O

7.7 Serial Interface #2

SIO2 is the second serial I/O port on the DSP1611/17/18/27/28/29. It is functionally the same as the first SIO.
Because the SIO2 is multiplexed with the PIO/PHIF, one or the other is typically used at one time although limited
use of the PIO/PHIF is possible with full use of the SIO2. This section will describe the features of the SIO2 that
differentiate it from the SIO1 (the user should refer

7.7.1 SIO2 Features

The SIO2 block is identical to SIO1 from a functional standpoint, but the SIO2 I/O signals are multiplexed with the
PIO/PHIF. Figure 7-18 shows the relationship between the pinouts of the PIO/PHIF and the SIO2. The functions of
the SIO2 pins are identical to those of SIO1.
SELECTION BY ESIO2
IN ioc REGISTER
IBF2
PIBF
† DSP1617 signal name.
7-26
Section 7.1, SIO Operation
SIO2
ILD2 DI2 ICK2
PIDS PB1
PB0
PSEL2
Figure 7-18. SIO2—PIO/PHIF Multiplexing
DRAFT COPY
PIO/PHIF
MULTIPLEXER
OCK2 DO2 OLD2
PCSN PSTAT PODS
†
†
PSEL1
Information Manual
for the features that are the same).
SYNC2 SADD2 OBE2
PBSEL PB3 POBE
†
PSEL0
Lucent Technologies Inc.
April 1998
DOEN2
PB2
5-4186.a