LSI Logic Confidential
15-70
Serial I/O Port
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
completes, SPI_SHIFT contains the last four bytes read
from SIO_SPI_MISO.
SPI Receive Header Register (SPI_RXHDR)
Offset = 0xFFBE001C
Read Only
Default = 0x0000 0000
RXHDR - SPI Receive Header [31:0]
This register contains the first four bytes received through
the SIO_SPI_MISO pin as part of a SPI cycle.
SPI Bit Granularity Register (SPI_BITGRAN)
Offset=0x 0xBE0020
Read/Write
Default=0x0000 0000
BCNT
SPI Bit Granularity
2:0
BCNT, together with the BSIZ field in the SPI_SIZE reg-
ister, allows the SPI interface to have bit granularity on
the last 32-bit word in a SPI cycle to be transferred. After
SPI_TEMP is written with the final word of data, any-
where from 8 to 32 of these bits can be sent out on the
pins. Sending out less than 8 bits is not allowed.
shows how many bits of the final 32-bit word
are sent out for the allowed values of BSIZ and BCNT.
If (BCNT != 0)
NumBits Transferred = (BSIZ)* 8 + BCNT
else
NumBits Transferred = (BSIZ + 1) * 8
31
16
RXHDR
15
0
RXHDR
31
16
RSVD
15
3
2
0
RSVD
BCNT
Содержание DMN-8600
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