Intel 855GME User Manual

288
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
Schematic Checklist Summary
12.4.3 Hub Interface Checklist
12.4.4 FWH/LPC Interface Checklist
Table 134. Hub Interface Checklist
Checklist Items Recommendations Reason/Impact
HI[11]
When HI_11 is not used:
Pull to V
SS
through a weak pull-down
resistor:
~60
Ω (when trace impedance is 60 Ω)
~56
Ω (when trace impedance is 56 Ω)
~50
Ω (when trace impedance is 50 Ω)
HI[11] will be driven by the 6300ESB
(should be terminated low depending
on board trace resistance).
HI[0:10] No extra pull-up resistor
HI_STBF No extra pull-up resistor
HI_STBS No extra pull-up resistor
HICLK
Ensure this pin is connected to a 66MHz
clock output of the clock generator (CK409)
through a 33
Ω resistor
HICOMP
Tie the HICOMP pin to a 52.3
Ω ±1% (when
trace impedance is 60
Ω) or 48.7 Ω ±1%
(when trace impedance is 56
Ω), or 43.2 Ω
±1% (when impedance is 50 Ω) pull-up
resistor (to V
CC
1_5).
ZCOMP is no longer supported.
HIREF
350 mV (See voltage divider recommenda-
tions in Section 8.1.4.)
HI_VSWING
800 mV (See voltage divider recommenda-
tions in Section 8.1.4.)
Table 135. FWH/LPC Interface Checklist
Checklist Items Recommendations Interface not used Reason/Impact
FWH[0:3]/
LAD[0:3]
No extra pull-ups required. Connect
straight to FWH/LPC.
May leave as no
connect
6300ESB integrates 20
KΩ nominal pull-up
resistors on these signal
lines.
LDRQ[0:1]
No extra pull-ups required. Connect
straight to LPC.
May leave as no
connect
6300ESB integrates 20
K
Ω nominal pull-up
resistors on these signal
lines.
FWH[4]/
LFRAME#
No extra pull-ups required. Connect
straight to FWH/LPC.
May leave as no
connect
6300ESB integrates 20
K
Ω nominal pull-up
resistors on these signal
lines.
FWH Decoupling Follow vendor recommendation.
May leave as no
connect

Intel 855GME Specifications

General

Brand	Intel
Model	855GME
Category	Computer Hardware
Language	English