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845GL Datasheet(PDF) 115 Page - Intel Corporation

Part # 845GL
Description  Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
PDF  193 Pages
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

845GL Datasheet(HTML) 115 Page - Intel Corporation

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Intel® 82845G/82845GL/82845GV GMCH Datasheet
115
Functional Description
4.3.2
PCI Semantic Transactions on AGP
The GMCH accepts and generates PCI semantic transactions on the AGP bus. The GMCH
guarantees that PCI semantic accesses to SDRAM are kept coherent with the processor caches by
generating snoops to the processor bus.
4.3.2.1
GMCH Initiator and Target PCI Operations
Table 4-7 summarizes PCI target operation support of the GMCH for AGP/PCI_B bus initiators.
The cycles can be either destined to main memory or the hub interface bus.
NOTE:
N/A refers to a function that is not applicable
As a target of an AGP/PCI cycle, the GMCH only supports the following transactions:
Memory Read: The GMCH issues one snoop and the entire cache line of read data is buffered. If
a memory read bursts across the cache line, another snoop is issued but the transaction will be
disconnected on the cache line boundary. Subsequent memory read transaction hitting the cache
line buffer return data from the buffer.
Table 4-7. PCI Commands Supported by GMCH When Acting As a PCI Target
PCI Command
GC/BE[3:0]# Encoding
GMCH
Cycle Destination
Response As PCI
Target
Interrupt Acknowledge
0000
N/A
No Response
Special Cycle
0001
N/A
No Response
I/O Read
0010
N/A
No Response
I/O Write
0011
N/A
No Response
Reserved
0100
N/A
No Response
Reserved
0101
N/A
No Response
Memory Read
0110
Main Memory
Read
0110
Hub Interface
No Response
Memory Write
0111
Main Memory
Posts Data
0111
Hub Interface
No Response
Reserved
1000
N/A
No Response
Reserved
1001
N/A
No Response
Configuration Read
1010
N/A
No Response
Configuration Write
1011
N/A
No Response
Memory Read Multiple
1100
Main Memory
Read
1100
Hub Interface
No Response
Dual Address Cycle
1101
N/A
No Response
Memory Read Line
1110
Main Memory
Read
1110
Hub Interface
No Response
Memory Write and Invalidate
1111
Main Memory
Posts Data
1111
Hub Interface
No Response



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