參數(shù)資料
型號: 82845PE
廠商: Intel Corp.
英文描述: 82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH)
中文描述: 82845GE圖形和內存控制器中樞(GMCH)和82845PE內存控制器中樞(MCH)
文件頁數(shù): 28/157頁
文件大小: 1407K
代理商: 82845PE
Intel
82845MP/82845MZ Chipset-Mobile (MCH-M)
28
Datasheet
250687-002
R
Signal Name
Type
Description
G_STOP#
I/O
s/t/s
AGP
G_STOP#:
Stop
During PIPE# and SBA Operation:
This signal is not used during PIPE# or SBA
operation.
During FRAME# Operation:
G_STOP# is an input when the MCH-M acts as a
FRAME#-based AGP initiator and is an output when the MCH-M acts as a
FRAME#-based AGP target. G_STOP# is used for disconnect, retry, and abort
sequences on the AGP interface
G_DEVSEL#
I/O
s/t/s
AGP
G_ DEVSEL#:
Device Select
During PIPE# and SBA Operation:
This signal is not used during PIPE# or SBA
operation.
During FRAME# Operation:
G_DEVSEL#, when asserted, indicates that a
FRAME#-based AGP target device has decoded its address as the target of the
current access. The MCH-M asserts G_DEVSEL# based on the SDRAM address
range being accessed by a PCI initiator. As an input, G_DEVSEL# indicates
whether the AGP master has recognized a PCI cycle to it.
G_REQ#
I
AGP
G_REQ#:
Request
During SBA Operation:
This signal is not used during SBA operation.
During PIPE# and FRAME# Operation:
G_REQ#, when asserted, indicates that
the AGP master is requesting use of the AGP interface to run a FRAME#- or
PIPE#-based operation.
G_GNT#
O
AGP
G_GNT#:
Grant
During SBA, PIPE# and FRAME# Operation:
G_GNT#, along with the
information on the ST[2:0] signals (status bus), indicates how the AGP interface will
be used next. Refer to the
AGP Interface Specification, Revision 2.0
for further
explanation of the ST[2:0] values and their meanings.
G_AD[31:0]
I/O
AGP
G_AD[31:0]:
Address/Data Bus
During PIPE# and FRAME# Operation:
The G_AD[31:0] signals are used to
transfer both address and data information on the AGP interface.
During SBA Operation:
The G_AD[31:0] signals are used to transfer data on the
AGP interface.
G_CBE[3:0]#
I/O
AGP
Command/Byte Enable
During FRAME# Operation:
During the address phase of a transaction, the
G_CBE[3:0]# signals define the bus command. During the data phase, the
G_CBE[3:0]# signals are used as byte enables. The byte enables determine which
byte lanes carry meaningful data. The commands issued on the G_CBE# signals
during FRAME#-based AGP transactions are the same G_CBE# command
described in the PCI 2.2 specification.
During PIPE# Operation:
When an address is enqueued using PIPE#, the C/BE#
signals carry command information. Refer to the
AGP 2.0 Interface Specification,
Revision 2.0
for the definition of these commands. The command encoding used
during PIPE#-based AGP is
different
than the command encoding used during
FRAME#-based AGP cycles (or standard PCI cycles on a PCI bus).
During SBA Operation:
These signals are not used during SBA operation.
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