82845GL datasheet(30/193 Pages) INTEL

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Signal Description

Intel® 82845G/82845GL/82845GV GMCH Datasheet

2.4.3

AGP Status Signals

2.4.4

AGP Strobes

Signal Name

Type

Description

GST_[2:0]

AGP

Status: GST_[2:0] provide information from the arbiter to an AGP Master on

what it may do. GST_[2:0] only have meaning to the master when its GGNT#

is asserted. When GGNT# is deasserted, these signals have no meaning and

must be ignored. GST_[2:0] are always an output from the GMCH and an

input to the master.

000 = Previously requested low priority read data is being returned to the

master

001 = Previously requested high priority read data is being returned to the

master.

010 = The master is to provide low priority write data for a previously queued

Write command.

011 = The master is to provide high priority write data for a previously queued

Write command.

100 = Reserved

101 = Reserved

110 = Reserved

111= The master has been given permission to start a bus transaction. The

master may queue AGP requests by asserting PIPE# or start a PCI

transaction by asserting FRAME#.

Signal Name

Type

Description

GADSTB_0

I/O (s/t/s)

AGP

GAD Bus Strobe-0: This signal provides timing for 2X and 4X clocked data on

GAD_[15:0] and GC/BE_[1:0]#. The agent that is providing data drives this

signal.

GADSTB_0#

I/O (s/t/s)

AGP

GAD Bus Strobe-0 Complement: GADSTB_0# is the differential complement to

the GAD_STB_0 signal. It is used to provide timing for 4X clocked data.

GADSTB_1

I/O (s/t/s)

AGP

GAD Bus Strobe-1: This signal provides timing for 2X and 4X clocked data on

GAD_[31:16] and GC/BE_[3:2]#. The agent that is providing data drives this

signal.

GADSTB_1#

I/O (s/t/s)

AGP

GAD Bus Strobe-1 Complement: GADSTB_1# is the differential complement to

the GADSTB_1 signal. It is used to provide timing for 4X clocked data.

GSBSTB

AGP

Sideband Strobe: This signal provides timing for 2X and 4X clocked data on the

GSBA[7:0] bus. It is driven by the AGP master after the system has been

configured for 2X or 4X clocked sideband address delivery.

GSBSTB#

AGP

Sideband Strobe Complement: GSBSTB# is the differential complement to the

GSBSTB signal. It is used to provide timing for 4X clocked data.

82845GL Datasheet(PDF) 30 Page - Intel Corporation

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