LSI Logic Confidential
15-68
Serial I/O Port
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
HAEN is cleared when the host writes SPI_TEMP.
If the ENAB bit is set (that is, the SPI cycle is running)
and HAEN=0, host writes to SPI_TEMP are discarded
and do not affect the state of the HAEN bit. HAEN=0
whenever ENAB=0, HUEN=0.
ENAB
SPI Enable
0
Set by the host to begin the SPI transfer. When set, host
writes to SPI_CONTROL and SPI_CONFIG are dis-
carded.
Cleared by the SPI module when the transfer completes.
This bit can be polled by software to check for cycle com-
pletion.
Note:
Reset interrupts the current cycle and clears this bit.
SPI DMA Size Register (SPI_DMASIZE)
Offset = 0xBE0010
Read/Write
Default = 0x0000 0000
BSIZ
SPI Data Transfer
10:0
This field defines the size of the data block to be trans-
ferred by the SPI interface over the pins.
In host-polled mode, the host or SPARC processor must
write/read the SPI_TEMP register BSIZ+1 times. After-
wards, the SPI_TEMP register must be written twice with
dummy data.
With the DMA engine, these write/read updates are taken
care of automatically. See
for more details.
31
16
RSVD
15
11
10
0
RSVD
BSIZ
Содержание DMN-8600
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