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190
Intel
82865G/82865GV GMCH Datasheet
Electrical Characteristics
NOTES:
1. Refer to the
Intel
Pentium
4 Processor with 512-KB L2 Cache on 0.13 Micron Process Datasheet
VCC
values used to calculate Vsh. For values pertaining to the Pentium 4 processor on 90 nm process, contact
your Intel field representative.
2. HDVREF is generically referred to as GTLREF throughout the rest of this chapter.
3. SMXRCOMPVOL/SMYRCOMPVOL and SMXRCOMPVOH/SMYRCOMPVOH have maximum input leakage
current of 1 mA.
4. Measured at receiver pad.
5. Standard 50
load to ground.
6. HI_REF and HI_SWING are derived from VCC (nominal VCC = 1.5 V) that is the nominal core voltage for the
GMCH. Voltage supply tolerance for a particular interface driver voltage must be within a 5% range of
nominal.
7. Nominal value of HI_REF is 0.350 V. The specification is at nominal VCC. Note that HI_REF varies linearly
with VCC; thus, VCC variation (± 5%) must be accounted for in the HI_REF specification in addition to the 2%
variation of HI_REF in the table.
8. Nominal value of HI_SWING is 0.800 V. The specification is at nominal VCC. Note that HI_SWING varies
linearly with VCC; thus, VCC variation (± 5%) must be accounted for in the HI_SWING specification in
addition to the 2% variation of HI_SWING in the table.
9. CI_REF and CI_SWING are derived from VCC (nominal VCC = 1.5 V) that is the nominal core voltage for the
GMCH. Voltage supply tolerance for a particular interface driver voltage must be within a 5% range of
nominal.
10.Nominal value of CI_VREF is 0.350 V. The specification is at nominal VCC. Note that CI_VREF varies
linearly with VCC; thus, VCC variation (± 5%) must be accounted for in the CI_VREF specification in addition
to the 2% variation of CI_REF in the table.
11.Nominal value of CI_SWING is 0.800 V. The specification is at nominal VCC. Note that CI_SWING varies
linearly with VCC; thus, VCC variation (± 5%) must be accounted for in the CI_SWING specification in
addition to the 2% variation of CI_SWING in the table.
12.For AC noise components >20 MHz, the maximum allowable noise component at the GMCH is ±180 mV at
VCC_nom, +180/-105 mV at VCC_min, and +105/-180 mV at VCC_max. For AC noise components
<20 MHz, the sum of the DC voltage and AC noise component must be within the specified DC minimum/
maximum operating range.
HDVREF
2
Host Reference Voltage
0.63 x Vsh_min – 2%
0.63 x Vsh
0.63 x Vsh_max
+ 2%
V
HDSWING/
HASWING
Host Compensation
Reference Voltage
1/4 x VTT_min – 2%
1/4 x VTT
1/4 x VTT_max
+ 2%
V
SMXRCOMPVOL
3
/
SMYRCOMPVOL
DDR RCOMP VOL
VCC_DDR_min *
(1/4.112) – 2%
VCC_DDR *
(1/4.112)
VCC_DDR_max *
(1/4.112) + 2%
V
SMXRCOMPVOH
3
/
SMYRCOMPVOH
DDR RCOMP VOH
VCC_DDR_min *
(3.112/4.112) - 2%
VCC_DDR *
(3.112/4.112)
VCC_DDR_max *
(3.112/4.112) + 2%
V
SMVREF
DDR Reference Voltage
0.49 x
VCC_DDR_min
0.5 x VCC_DDR
0.51 x
VCC_DDR_max
V
Table 37. DC Operating Characteristics (Sheet 2 of 2)
Signal Name
Parameter
Min
Nom
Max
Unit