LSI Logic Confidential
SIO Register Descriptions
15-67
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
•
SIO_SPI_CS[n] assertion and SIO_SPI_CLK ungat-
ing
•
SIO_SPI_CS[n] negation and SIO_SPI_CLK gating
shows the relationship between the CSBK,
CSDL, and IBBK fields.
CSSL[3:0]- SPI Chip Select Enable
3:0
These bits select which of the SPI chip select lines is
used for the current SPI cycle. The bit encoding is shown
in
When the SPI cycle is idle, all four chip select lines are
in the negated state set by CSPL.
Note:
Additional selects can be decoded through external logic, if
required.
SPI Control Register (SPI_CONTROL)
Offset = 0xBE0004
Read/Write
Default = 0x0000 0000
HAEN
Host Access Enable
1
1 = Host access of SPI_TEMP is enabled.
HAEN is set when the SPI_TEMP register is loaded with
the contents of SPI_SHIFT.
Table 15.9
CSSL Bit to Chip Select Mapping
Bit
Signal
CSSL: 0001
SIO_SPI_CS[0] enabled
CSSL: 0010
SIO_SPI_CS[1] enabled
CSSL: 0100
SIO_SPI_CS[2] enabled
CSSL: 1000
SIO_SPI_CS[3] enabled
31
16
RSVD
15
2
1
0
RSVD
HAEN
ENAB
Содержание DMN-8600
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