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3.5
82443GX Host Bridge
3.5.1
82443GX Interface
Table 3-4. 82443GX Connectivity (Sheet 1 of 3)
SIGNAL
AD#[31:0]
ADS#
AGPREF
BNR#
BPRI#
BREQ0#
GXPWROK
C/BE[3:0]#
FENA
GCKE
CLKRUN#
CPURST#
CRESET#
CSA[5:0]#
CSA[7:6]#
CSB[5:0]#
CSB[7:6]#
DBSY#, DRDY#
DCLKO
DCLKWR,
Pin AB22 (NC)
DEFER#
DEVSEL#
DQMA[7:0]
DQMB5, DQMB1
FRAME#
GAD[31:0], GC/
BE[3:0]#
GCLKIN
GCLKOUT
®
Intel
440GX AGPset Design Guide
Connected to PCI bus.
Connected to CPUs.
Connected to be 0.4 of VCC
3.3
Connected to CPUs.
Connected to CPUs.
Connected to CPUs.
Connected to PIIX4E PWROK pin.
Connected to PCI bus.
4DIMM Design: Connected to FET-switches as an enable pin.
GCKE needs to be disabled for register DIMMS.
GCKE is a NC unless connected to SN74ALVCH16374 16-bit D flip-flop. See
reference schematics for details.
If not connected to the PIIX4E, pull down through a 100 ohm resistor at both
82443GX and PIIX4E.
Connected to CPUs and ITP (240 ohm series resistor).
10K ohm pull-up to 3.3V. Controls the mux for the CPU strapping signals.
Connect to DIMMs; two to each
Connect CSA[7:6]# to DIMM 3.
Connect to DIMMs; two to each
Connect CSB[7:6]# to DIMM 3
Connected to CPUs.
Connected to CKBF. 22 ohm series resistor placed next to 443GX and 47 ohm series
resistor placed next to CKBF.
Driven by single clock from CKBF. See Clock section
Connected to CPUs.
2.7K ohm pull-up to 5V. Connected to PCI bus.
Connected to all DIMMs.
4 DIMM: Connected to DIMM2 and DIMM3.
2.7K ohm pull-up to 5V. Connected to PCI bus.
Connected to AGP connector.
Connected to GCLKOUT through 22 ohm resistor.
Connected to AGP connector through 22 ohm series resistor.
CONNECTION
. Can be performed by a voltage divider.
Design Checklist
3-10
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