876784 Intel, 876784 Datasheet - Page 771

• Manufacturer Part Number: 876784
• Manufacturer: Intel

Specifications of 876784

• Lead Free Status / RoHS Status: Compliant

Serial Peripheral Interface (SPI) (Desktop and Mobile Only)
21.1.7
Note:
Intel
®
ICH7 Family Datasheet
OPTYPE—Opcode Type Configuration Register
(SPI Memory Mapped Configuration Registers)
Memory Address:SPIBAR + 56h
Default Value:
Entries in this register correspond to the entries in the Opcode Menu Configuration
register.
The definition below only provides write protection for opcodes that have addresses
associated with them. Therefore, any erase or write opcodes that do not use an address
should be avoided (for example, “Chip Erase” and “Auto-Address Increment Byte
Program”)
NOTE: This register is not writable when the SPI Configuration Lock-Down bit (SPIBAR + 00h:15)
15:14
13:12
11:10
9:8
7:6
5:4
3:2
1:0
Bit
is set.
Opcode Type 7 — R/W. See the description for bits 1:0
Opcode Type 6 — R/W. See the description for bits 1:0
Opcode Type 5 — R/W. See the description for bits 1:0
Opcode Type 4 — R/W. See the description for bits 1:0
Opcode Type 3 — R/W. See the description for bits 1:0
Opcode Type 2 — R/W. See the description for bits 1:0
Opcode Type 1 — R/W. See the description for bits 1:0
Opcode Type 0 — R/W. This field specifies information about the corresponding
Opcode 0. This information allows the hardware to, 1) know whether to use the address
field and, 2) provide BIOS and Shared Flash protection capabilities. The encoding of the
two bits is:
00 = No address associated with this Opcode; Read cycle type
01 = No address associated with this Opcode; Write cycle type
10 = Address required; Read cycle type
11 = Address required; Write cycle type
0000h
Description
Attribute:
Size:
R/W
16 bits
771