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Intel
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854 Graphics Memory Controller Hub (GMCH)
28 D15343-003
3.1 Host Interface Signals
Table 5. Host Interface Signal Descriptions
Signal Name Type Description
ADS# I/O
AGTL+
Address Strobe: The system bus owner asserts ADS# to indicate the
first of two cycles of a request phase. The GMCH can assert this signal
for snoop cycles and interrupt messages.
BNR# I/O
AGTL+
Block Next Request: Used to block the current request bus owner from
issuing a new request. This signal is used to dynamically control the CPU
bus pipeline depth.
BPRI# O
AGTL+
Bus Priority Request: The GMCH is the only Priority Agent on the
system bus. It asserts this signal to obtain the ownership of the address
bus. This signal has priority over symmetric bus requests and will cause
the current symmetric owner to stop issuing new transactions unless the
HLOCK# signal was asserted.
BREQ0# I/O
AGTL+
Bus Request 0#: The GMCH pulls the processor bus BREQ0# signal
low during CPURST#. The signal is sampled by the processor on the
active-to-inactive transition of CPURST#. The minimum setup time for
this signal is 4 BCLKs. The minimum hold time is 2 clocks and the
maximum hold time is 20 BCLKs. BREQ0# should be tristated after the
hold time requirement has been satisfied.
During regular operation, the GMCH will use BREQ0# as an early
indication for FSB Address and Ctl input buffer and sense amp activation.
CPURST# O
AGTL+
CPU Reset: The CPURST# pin is an output from the GMCH. The
GMCH asserts CPURST# while RESET# (PCIRST# from ICH4-M) is
asserted and for approximately 1 ms after RESET# is deasserted. The
CPURST# allows the processor to begin execution in a known state.
Note that the ICH4-M must provide CPU strap set-up and hold-times
around CPURST#. This requires strict synchronization between GMCH,
CPURST# deassertion and ICH4-M driving the straps.
DBSY# I/O
AGTL+
Data Bus Busy: Used by the data bus owner to hold the data bus for
transfers requiring more than one cycle.
DEFER# O
AGTL+
Defer: GMCH will generate a deferred response as defined by the rules
of the GMCH’s Dynamic Defer policy. The GMCH will also use the
DEFER# signal to indicate a CPU retry response.
DINV[3:0]# I/O
AGTL+
Dynamic Bus Inversion: Driven along with the HD[63:0]# signals.
Indicates if the associated signals are inverted or not. DINV[3:0]# are
asserted such that the number of data bits driven electrically low (low
voltage) within the corresponding 16-bit group never exceeds 8.
DINV#
Data Bits
DINV[3]# HD[63:48]#
DINV[2]# HD[47:32]#
DINV[1]# HD[31:16]#
DINV[0]# HD[16:0]#
DPSLP# I
CMOS
Deep Sleep #: This signal comes from the ICH4-M device, providing an
indication of C3 and C4 state control to the CPU. Deassertion of this
signal is used as an early indication for C3 and C4 wake up (to active
HPLL). Note that this is a low-voltage CMOS buffer operating on the FSB
VTT power plane.