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| 82845MP Datasheet, PDF (118/157 Pages) Intel Corporation – Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M) | |||
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Intel®82845MP/82845MZ Chipset-Mobile (MCH-M)
R
AGP PIPE# or SBA[7:0] protocol transactions to DRAM do not get snooped and are, therefore, not
coherent with the processor caches. AGP FRAME# protocol transactions to DRAM are snooped. AGP
PIPE# and SBA[7:0] accesses to and from the hub interface are not supported. AGP FRAME# access
from an AGP master to the hub interface are also not supported. Only AGP FRAME# memory writes
from the hub interface are supported.
5.3.1. AGP Target Operations
The MCH-M supports AGP cycles targeting main memory only. The MCH-M supports interleaved AGP
PIPE#] and AGP FRAME# transactions, or AGP SBA[7:0] and AGP FRAME# transactions.
Table 29. AGP Commands Supported by the MCH-M When Acting as an AGP Target
AGP
Command
C/BE[3:0]#
Encoding
Cycle Destination
MCH-M Host Bridge
Response as PCIx Target
Read
Hi-Priority Read
Reserved
0000
0000
0001
0000
0010
Main Memory
The Hub interface
Main Memory
The Hub interface
N/A
Low Priority Read
Complete with random data; does not go to the hub
interface
High Priority Read
Complete with random data; does not go to the hub
interface
No Response
Reserved
Write
Hi-Priority Write
Reserved
Reserved
Long Read
Hi-Priority Long
Read
Flush
Reserved
Fence
Reserved
Reserved
0011
0100
0100
0101
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
N/A
Main Memory
The Hub interface
Main Memory
The Hub interface
N/A
N/A
Main Memory
The Hub interface
Main Memory
The Hub interface
MCH-M
N/A
MCH-M
N/A
N/A
No Response
Low Priority Write
Cycle goes to DRAM with BEâs inactive; does not go to
the hub interface
High Priority Write
Cycle goes to DRAM with BEâs inactive; does not go to
the hub interface
No Response
No Response
Low Priority Read
Complete with random data; does not go to the hub
interface
High Priority Read
Complete with random data; does not go to the hub
interface
Complete with QW of Random Data
No Response
No Response - Flag inserted in MCH-M request queue
No Response
No Response
118
Datasheet
250687-002
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