21285-AB

Manufacturer Part Number21285-AB
DescriptionMicroprocessor, 21285 Core Logic For SA-110 Microprocessor
ManufacturerIntel Corporation
21285-AB datasheet
 


Specifications of 21285-AB

CaseBGADc99+/00+
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Page 96/159:

Revision ID Register Offset

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Registers
7.1.5
Revision ID Register—Offset 08h
Dword Bit
Name
7:0
Revision ID
7.1.6
Class Code Register—Offset 0Ah
Dword Bit
Name
31:8
Class code
7.1.7
Cache Line Size Register—Offset 0Ch
Dword Bit
Name
7:0
Cache line size
7.1.8
Latency Timer Register—Offset 0Dh
Dword Bit
Name
15:8
Latency timer
7.1.9
Header Type Register—Offset 0Eh
Dword Bit
Name
23:16
Header type
7-6
R/W
Description
R
Indicates the revision number of this device. The initial
revision reads as 0. Subsequent revisions increment by 1.
R/W
Description
R
Reads as 0B4001h if ma[3] = 1 at reset.
Reads as 0E0001h if ma[3] = 0 at reset.
R/W
Description
R/W
Indicates the number of Dwords in the host processor’s
cache line. Legal values are 4, 8, or 16. Other values are
treated as 8. Used during memory writes initiated by the
21285 to determine whether to use the memory write or
memory write and invalidate command.
Reset value: 0.
R/W
Description
R/W
Indicates the value of the latency timer, which limits the
length of a burst that the 21285 performs as master when
its bus grant is removed.
Reset value: 0.
R/W
Description
R
Reads as 0 indicating a header type of zero.
21285 Core Logic for SA-110 Datasheet