Spi Receive Data Buffer Register (Rxspi); Dma Registers; Spi Dma Internal Index Register (Iispi); Spi Dma Address Modifier Register (Imspi) - Analog Devices ADSP-21261 SHARC Hardware Reference Manual

SPI Receive Data Buffer Register (RXSPI)

The Receive Data Buffer register (
ter that is accessible by both the software and DMA. At the end of a data
transfer, the data in the Receive Shift register (
register. During a DMA receive operation, the data in the
automatically read by the DMA. A shadow register for the receive data
buffer, , supports software debugging functions. See
RXSPI
Data Buffer Shadow Register (RXSPI_SHADOW)" on page

DMA Registers

The following registers configure and manage SPI DMA functions.

SPI DMA Internal Index Register (IISPI)

This 19-bit register contains the address where the IOP transfers data to
or from. Initially, this register holds the first address of the source or desti-
nation buffer, and then as the DMA progresses, this register is modified by
the value in
IMSPI

SPI DMA Address Modifier Register (IMSPI)

This 16-bit register contains the DMA address modifier. After the IOP
transfers each word between memory and the
value is used to increment the internal index,
ADSP-2126x SHARC Processor Hardware Reference
RXSPI
.
Serial Peripheral Interface Port
) is a 32-bit read-only (RO) regis-
) loads into the
RXSR
/
TXSPI RXSPI
IISPI
RXSPI
register is
RXSPI
"SPI Receive
A-101.
register, this
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