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參數(shù)資料
| 型號： | 82845Gx |
| 廠商： | Intel Corp. |
| 英文描述： | Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH) |
| 中文描述： | 英特爾82845G/82845GL/82845GV圖形和內存控制器中樞（GMCH） |
| 文件頁數(shù)： | 118/193頁 |
| 文件大?。?/td> | 2990K |
| 代理商： | 82845GX |
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Functional Description
118
Intel
82845G/82845GL/82845GV GMCH Datasheet
Reads
Read cycle is immediately retried (the GMCH retries the read cycle in three PCI clocks from
GFRAME# driven active) due to a pending processor-AGP or hub interface-AGP write
transaction. It is further handled using the Delayed Transaction mechanism described in a later
section. This can occur as a result of the processor posting memory write cycles to the AGP or
the GMCH storing a processor to AGP write cycle in the deferred queue. The SDRAM read
cycle is immediately retried and the GMCH initiates the Delayed Transaction activity by
issuing a single snoop on the processor bus. The Delayed transaction cannot complete until
after the pending processor-AGP or hub interface-AGP transactions have been completed on
the AGP.
Processor-to-AGP write or hub interface-to-AGP write is posted after the processing of AGP/
PCI to SDRAM read has started but prior to data being returned. This scenario can occur due
to the level of concurrency supported by GMCH. The AGP/PCI cycle will be retried as soon as
condition is recognized and it is further handled as a Delayed Transaction.
Processor-to-AGP read request is internally pending when an AGP-DRAM read is issued or
processor-to-AGP read request is issued after an AGP-DRAM read request is generated. The
AGP cycle is retried based on 32-clock timeout. The timer is triggered at the point when
internally pending processor-to-AGP read request is observed.
Processor-to-AGP write occurs after AGP-to-SDRAM memory read line or memory read
multiple data has been returned. The GMCH stops snooping ahead when the processor-to-
AGP write occurs and the GMCH disconnects when the last DWord of data is read (between 2
and 3 cachelines).
AGP-DRAM burst is disconnected after crossing the 4-KB address boundary.
AGP-DRAM burst is disconnected if consecutive data phase can not complete within 8 clocks
and there is an AGP non-snoopable request or host bridge-to-AGP request pending.
AGP-DRAM burst is disconnected after crossing a 2-KB address. No snoop is generated into
next 2-KB page.
Writes
If the AGP/PCI Inbound buffer is full, the GMCH retries initial write request in the presence of
a pending AGP request issued by the AGP master using enhanced AGP protocol (i.e., non-
snoopable) or in the presence of host bridge request for AGP ownership (when there is a
pending processor-AGP or hub interface-AGP transaction).
If the AGP Inbound buffer is full and there is no pending AGP non-snoopable request and no
host bridge request, the GMCH inserts wait states. It retries as soon as AGP non-snoopable
request is generated or an internal host bridge to AGP request is generated.
If AGP Inbound buffers become full during the burst, the GMCH disconnects within 8 clocks
if there is an AGP non-snoopable request or host bridge-to-AGP request present.
An AGP-DRAM burst is disconnected after crossing the 2-KB address boundary.
相關PDF資料 |
PDF描述 |
|---|---|
| 82845MP | Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M) |
| 82845Mx | Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M) |
| 82845MZ | Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M) |
| 82845PE | 82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH) |
| 82845GE | 82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 82845MP | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M) |
| 82845MX | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M) |
| 82845MZ | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M) |
| 82845PE | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH) |
| 8284611SM | 制造商:Thomas & Betts 功能描述: |
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