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參數(shù)資料
| 型號： | 82845GL |
| 廠商： | INTEL CORP |
| 元件分類： | 外設及接口 |
| 英文描述： | Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH) |
| 中文描述： | MULTIFUNCTION PERIPHERAL, PBGA760 |
| 封裝： | 37.50 X 37.50 MM, 1 MM PITCH, FLIP CHIP, BGA-760 |
| 文件頁數(shù)： | 116/193頁 |
| 文件大?。?/td> | 2990K |
| 代理商： | 82845GL |
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Functional Description
116
Intel
82845G/82845GL/82845GV GMCH Datasheet
Memory Read Line, and Memory Read Multiple:
These commands are treated identically
by the GMCH. The GMCH issues two snoops (a snoop followed by a snoop-ahead) on the host bus
and releases the processor bus for other traffic. When the first DWord of the first cache line is
delivered and GFRAME# is still asserted, the GMCH issues another snoop-ahead on the host bus.
This allows the GMCH to continuously supply data during memory read line and memory read
multiple bursts. When the transaction terminates, there may be a minimum of 2 cache lines and a
maximum of 2 cache lines plus 7 DWords buffered. Subsequent memory reads hitting the buffers
will return data from the buffer.
Memory Write and Memory Write and Invalidate:
These commands are aliased and
processed identically. The GMCH supports data streaming for PCI-to-DRAM writes based on its
ability to buffer up to 128 bytes (16 QWords) of data before a snoop cycle must be completed on
the host bus. The GMCH is typically able to support longer write bursts, with the maximum length
dependent upon concurrent host bus traffic during PCI-DRAM write data streaming.
Fast Back-to-Back Transactions
:
The GMCH, as a target, supports fast back-to-back cycles
from a PCI initiator. As a PCI initiator, the GMCH is responsible for translating host cycles to
AGP/PCI_B cycles. The GMCH also transfers hub interface to AGP/PCI_B write cycles.
Table 4-8
shows all the cycles that need to be translated.
Table 4-8. PCI Commands Supported by GMCH When Acting As an AGP/PCI_B Initiator
(Sheet 1 of 2)
Source Bus
Command
Other Encoded Information
GMCH Host Bridge
Corresponding
PCI_B Command
GC/BE[3:0]#
Encoding
Source Bus: Host
Deferred Reply
Don’t Care
None
N/A
Interrupt Acknowledge
Length
≤
8 Bytes
None
N/A
Special Cycle
Shutdown
None
N/A
Halt
None
N/A
Stop Clock Grant
None
N/A
All Other Combinations
None
N/A
Branch Trace Message
None
None
N/A
I/O Read
Length
≤
8 Bytes up to 4 BEx Asserted
I/O Read
0010
I/O Write
Length
≤
8 Bytes up to 4 BEx Asserted
I/O Write
0011
I/O Read to 0CFCh
Length
≤
8 Bytes up to 4 BEx Asserted
Configuration Read
1010
I/O Write to 0CFCh
Length
≤
8 Bytes up to 4 BEx Asserted
Configuration Write
1011
Length
<
8 Bytes without All BEs Asserted
Memory Read
0110
Memory Read (Code or
Data)
Length =
8 Bytes with All BEs Asserted
Memory Read
1110
Memory Read
Invalidate
Length =
16 Bytes
None
N/A
Length = 32 Bytes Code Only
Memory Read
1110
Memory Write
Length
<
8 Bytes without All BEs Asserted
Memory Write
0111
Length =
16 Bytes
None
N/A
Length = 32 Bytes
Memory Write
0111
Locked Access
All Combinations
Unlocked Access
1
As Applicable
Reserved Encodings
All Combinations
None
N/A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 82845GV | Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH) |
| 82845Gx | Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH) |
| 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) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 82845GV | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH) |
| 82845GX | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH) |
| 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) |
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