Datasheet

Signal Description

36 Datasheet

2.3.4 AGP Strobes

Table 8. AGP Strobe Descriptions

Signal Name Type Description

GADSTB[0] I/O

AGP

Address/Data Bus Strobe-0: provides timing for 2X and 4X data on

AD[15:0] and C/BE[1:0]# signals. The agent that is providing the data will

drive this signal.

GADSTB#[0] I/O

AGP

Address/Data Bus Strobe-0 Complement: With AD STB0, forms a

differential strobe pair that provides timing information for the AD[15:0]

and C/BE[1:0]# signals in 4X mode. The agent that is providing the data

will drive this signal.

GADSTB[1] I/O

AGP

Address/Data Bus Strobe-1: Provides timing for 2X and 4X data on

AD[31:16] and C/BE[3:2]# signals. The agent that is providing the data

will drive this signal.

GADSTB#[1] I/O

AGP

Address/Data Bus Strobe-1 Complement: With AD STB1, forms a

differential strobe pair that provides timing information for the AD[15:0] and

C/BE[1:0]# signals in 4X mode. The agent that is providing the data will

drive this signal.

GSBSTB I

AGP

Sideband Strobe: Provides timing for 2X and 4X data on the SBA[7:0]

bus. It is driven by the AGP master after the system has been configured

for 2X or 4X sideband address mode.

GSBSTB# I

AGP

Sideband Strobe Complement: The differential complement to the

SB_STB signal. It is used to provide timing 4X mode.