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Signal Description
D15343-003 29
DRDY# I/O
AGTL+
Data Ready: Asserted for each cycle that data is transferred.
HA[31:3]# I/O
AGTL+
Host Address Bus: HA[31:3]# connects to the CPU address bus. During
processor cycles the HA[31:3]# are inputs. The GMCH drives HA[31:3]#
during snoop cycles on behalf of Hub interface. HA[31:3]# are
transferred at 2x rate. Note that the address is inverted on the CPU bus.
HADSTB[1:0]# I/O
AGTL+
Host Address Strobe: HA[31:3]# connects to the CPU address bus.
During CPU cycles, the source synchronous strobes are used to transfer
HA[31:3]# and HREQ[4:0]# at the 2x transfer rate.
Strobe
Address Bits
HADSTB[0]# HA[16:3]#, HREQ[4:0]#
HADSTB[1]# HA[31:17]#
HD[63:0]# I/O
AGTL+
Host Data: These signals are connected to the CPU data bus.
HD[63:0]# are transferred at 4x rate. Note that the data signals are
inverted on the CPU bus.
HDSTBP[3:0]#
HDSTBN[3:0]#
I/O
AGTL+
Differential Host Data Strobes: The differential source synchronous
strobes are used to transfer HD[63:0]# and DINV[3:0]# at the 4x
transfer rate.
Strobe
Data Bits
HDSTBP[3]#, HDSTBN[3]# HD[63:48]#, DINV[3]#
HDSTBP[2]#, HDSTBN[2]# HD[47:32]#, DINV[2]#
HDSTBP[1]#, HDSTBN[1]# HD[31:16]#, DINV[1]#
HDSTBP[0]#, HDSTBN[0]# HD[15:0]#, DINV[0]#
HIT# I/O
AGTL+
Hit: Indicates that a caching agent holds an unmodified version of the
requested line. Also, driven in conjunction with HITM# by the target to
extend the snoop window.
HITM# I/O
AGTL+
Hit Modified: Indicates that a caching agent holds a modified version of
the requested line and that this agent assumes responsibility for
providing the line. Also, driven in conjunction with HIT# to extend the
snoop window.
HLOCK# I/O
AGTL+
Host Lock: All CPU bus cycles sampled with the assertion of HLOCK#
and ADS#, until the negation of HLOCK# must be atomic; that is, no Hub
interface snoopable access to system memory is allowed when HLOCK#
is asserted by the CPU.
HREQ[4:0]# I/O
AGTL+
Host Request Command: Defines the attributes of the request.
HREQ[4:0]# are transferred at 2x rate. Asserted by the requesting agent
during both halves of the Request Phase. In the first half the signals
define the transaction type to a level of detail that is sufficient to begin a
snoop request. In the second half the signals carry additional information
to define the complete transaction type.
The transactions supported by the GMCH Host Bridge are defined in the
Host Interface section of this document.
HTRDY# O
AGTL+
Host Target Ready: Indicates that the target of the processor
transaction is able to enter the data transfer phase.