876784 Intel, 876784 Datasheet - Page 765

• Manufacturer Part Number: 876784
• Manufacturer: Intel

Specifications of 876784

• Lead Free Status / RoHS Status: Compliant

Serial Peripheral Interface (SPI) (Desktop and Mobile Only)
21
Note:
21.1
Table 21-1. Serial Peripheral Interface (SPI) Register Address Map
Intel
®
ICH7 Family Datasheet
Serial Peripheral Interface
(SPI) (Desktop and Mobile
Only)
The Serial Peripheral Interface resides in memory mapped space. This function contains
registers that allow for the setup and programming of devices that reside on the SPI
interface.
All registers in this function (including memory-mapped registers) must be addressable
in Byte, Word, and DWord quantities. The software must always make register accesses
on natural boundaries (i.e., DWord accesses must be on DWord boundaries; word
accesses on word boundaries, etc.) In addition, the memory-mapped register space
must not be accessed with the LOCK semantic exclusive-access mechanism. If software
attempts exclusive-access mechanisms to the SPI memory-mapped space, the results
are undefined.
Serial Peripheral Interface Memory Mapped
Configuration Registers
The SPI Host Interface registers are memory-mapped in the RCRB Chipset Register
Space with a base address (SPIBAR) of 3020h and are located within the range of
3020h to 308Fh. The individual registers are then accessible at SPIBAR + Offset as
indicated in the following table.
These memory mapped registers must be accessed in byte, word, or DWord quantities.
(SPI Memory Mapped Configuration Registers) (Sheet 1 of 2)
SPIBAR +
00h–01h
02h–03h
04h–07h
10h–17h
20h–27h
30h–37h
40h–47h
08h–0Fh
18h–1Fh
28h–2Fh
38h–3Fh
Offset
Mnemonic
SPID0
SPID2
SPID4
SPID6
SPID1
SPID3
SPID5
SPID7
SPIC
SPIS
SPIA
SPI Status
SPI Control
SPI Address
SPI Data 0
SPI Data 1
SPI Data 2
SPI Data 3
SPI Data 4
SPI Data 5
SPI Data 6
SPI Data 7
Register Name
See Register
See Register
00000000h
00000000h
00000000h
00000000h
00000000h
00000000h
00000000h
Description
00000000h
Description
00000000
00000000
00000000
00000000
00000000
00000000
00000000
Default
0001h
RO, R/WC,
Access
R/WLO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
765