Samsung S3F401F User Manual
Page 213
SSP
S3F401F_UM_REV1.00
10-12
SPI Master
MOSI
MISO
SCK
PL022 Configured as Slave
0V
PL022 Configured as Slave
SSPRXD
SSPTXD
SSPFSS
SSPCLK
SS
V
DD
0V
SSPRXD
SSPTXD
SSPFSS
SSPCLK
Figure 10-10. SPI master coupled to two PrimeCell SSP slaves
Above figure shows a Motorola SPI configured as a master and interfaced to two instances of PrimeCell SSP
(PL022) configured as slaves. In this case the slave Select Signal (SS) is permanently tied HIGH and configures it
as a master. The master can broadcast to the two slaves through the master SPI MOSI line and in response, only
one slave drives its nSSPOE signal LOW. This enables its SSPTXD data onto the MISO line of the master.
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