Spi Device Select Signal; Master Out Slave In (Mosi); Master In Slave Out (Miso) - Analog Devices ADSP-21261 SHARC Hardware Reference Manual

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SPI Interface Signals

requires these signals to be manually controlled in software via the

SPI Device Select Signal

signal is the Serial Peripheral Interface Device Select Input sig-

nal. This is an active low signal used to enable an ADSP-2126x configured

as a slave device. This input-only pin behaves like a chip select, and is pro-

vided by the master device for the slave devices. When the processor is the

SPI-master in a multimaster environment, the

signal. In multimaster mode, if the

asserted (driven low), an error has occurred. This means that another

device is also trying to be the master device.

pin is one of the bidirectional I/O data pins. If the processor is

configured as a master, the

If the processor is configured as a slave, the

receive (input) pin. In an ADSP-2126x processor SPI interconnection, the

data is shifted out from the

input of the slave.

pin is one of the bidirectional I/O data pins. If the ADSP-2126x

is configured as a master, the

If the ADSP-2126x is configured as a slave, the

transmit (output) pin. In an SPI interconnection, the data is shifted out

of the master.

Only one slave is allowed to transmit data at any given time.

illustrates how the ADSP-2126x can be used as the slave SPI device. The

pin becomes a data transmit (output) pin.

output pin of the slave and shifted into the

ADSP-2126x SHARC Processor Hardware Reference

bits are ignored when

input signal of a master is

pin becomes a data

output pin of the master and shifted into

pin becomes a data receive (input) pin.

pin acts as an error

pin becomes a data

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