RG82845 S L5YQ Intel, RG82845 S L5YQ Datasheet - Page 67
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RG82845 S L5YQ
Manufacturer Part Number
RG82845 S L5YQ
Description
Manufacturer
Intel
Datasheet
1.RG82845_S_L5YQ.pdf
(148 pages)
Specifications of RG82845 S L5YQ
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3.5.27
Intel
®
82845 MCH for SDR Datasheet
R
AGPCMD—AGP Command Register (Device 0)
Address Offset:
Default Value:
Access:
Size:
This register provides control of the AGP operational parameters.
31:10
Bit
7:5
2:0
9
8
4
3
Reserved.
SideBand Address Enable (SBAEN).
0 = Disable.
1 = Enable.
AGP Enable (AGPEN).
0 = The MCH ignores all AGP operations, including the sync cycle. Any AGP operation received
1 = The MCH will respond to AGP operations delivered via PIPE# or to operations delivered via
Reserved.
Fast Write Enable (FWEN).
0 = When this bit is set to 0, or when the data rate bits are set to 1x mode, the memory write
1 = MCH uses the Fast Write protocol for memory write transactions from the MCH to the AGP
Reserved.
Data Rate (DRATE). The settings of these bits determine the AGP data transfer rate. One (and
only one) bit in this field must be set to indicate the desired data transfer rate.
001 = 1x transfer mode
010 = 2x transfer mode
100 = 4x transfer mode
Configuration software updates this field by setting only one bit that corresponds to the capability
of AGP master (after that capability has been verified by accessing the same functional register
in the AGP masters’ configuration space.)
Note: This field applies to AD and SBA buses. It also applies to Fast Writes if they are enabled.
while this bit is 1 will be serviced, even if this bit is set to 0. If this bit transitions from a 1 to a 0
on a clock edge in the middle of an SBA command being delivered in 1X mode, the command
will be issued.
SBA if the AGP Side Band Enable bit is also set to 1.
transactions from the MCH to the AGP master use standard PCI protocol.
master. Fast Writes occur at the data transfer rate selected by the DRATE bits (2:0) in this
register.
A8–ABh
0000_0000h
R/W
32 bits
Description
Register Description
67
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