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Intel
82865G/82865GV GMCH Datasheet
35
Signal Description
2.5.4
AGP Strobes
NOTE:
1. The term
(2.0)
following a signal name indicates its function in AGP 2.0 signaling mode (1.5 V swing).
2. The term
(3.0)
following a signal name indicates its function in AGP 3.0 signaling mode (0.8 V swing).
Signal Name
Type
Description
GADSTB0
(2.0)
GADSTBF0
(3.0)
I/O
(s/t/s)
AGP
AD Bus Strobe-0:
GADSTB0 provides timing for 4X clocked data on
GAD[15:0] and GC/BE[1:0]# in AGP 2.0 signaling mode. The agent that is
providing data drives this signal.
AD Bus Strobe First-0:
In AGP 3.0 signaling mode GADSTBF0 strobes the
first and all odd numbered data items with a low-to-high transition. It is used
with GAD[15:0] and GC#/BE[1:0].
GADSTB0#
(2.0)
GADSTBS0
(3.0)
I/O
(s/t/s)
AGP
AD Bus Strobe-0 Complement:
GADSTB0# is the differential complement to
the GADSTB0
signal. It is used to provide timing for 4X clocked data in AGP
2.0 signaling mode.
AD Bus Strobe Second-0:
In AGP 3.0 signaling mode GADSTBS0 strobes
the second and all even numbered data items with a low-to-high transition.
GADSTB1
(2.0)
GADSTBF1
(3.0)
I/O
(s/t/s)
AGP
AD Bus Strobe-1:
GADSTB1 provides timing for 4X clocked data on
GAD[31:16] and GC/BE[3:2]# in AGP 2.0 signaling mode. The agent that is
providing data drives this signal.
AD Bus Strobe First-1:
In AGP 3.0 signaling mode GADSTBF1 strobes the
first and all odd numbered data items with a low-to-high transition. It is used
with GAD[31:16], GC#/BE[3:2], DBI_HI, and DBI_LO.
GADSTB1#
(2.0)
GADSTBS1
(3.0)
I/O
(s/t/s)
AGP
AD Bus Strobe-1 Complement:
GADSTB1# is the differential complement to
the GADSTB1
signal. It is used to provide timing for 4X clocked data in AGP
2.0 signaling mode.
AD Bus STrobe Second-1:
In AGP 3.0 signaling mode GADSTBS1 strobes
the second and all even numbered data items with a low-to-high transition.
GSBSTB
(2.0)
GSBSTBF
(3.0)
I
AGP
Sideband Strobe:
GSBSTB provides timing for 4X clocked data on the
GSBA[7:0] bus in AGP 2.0 signaling mode. It is driven by the AGP master
after the system has been configured for 4X clocked sideband address
delivery.
Sideband Strobe First:
In AGP 3.0 signaling mode GSBSTBF strobes the
first and all odd numbered data items with a low-to-high transition.
GSBSTB#
(2.0)
GSBSTBS
(3.0)
I
AGP
Sideband Strobe Complement:
GSBSTB# is the differential complement to
the GSBSTB signal. It is used to provide timing for 4X clocked data in AGP
2.0 signaling mode.
Sideband Strobe Second:
In AGP 3.0 signaling mode GSBSTBS strobes
the second and all even numbered data items with a low-to-high transition.