Gmch Decoupling Recommendations Checklist - Intel 855GME Design Manual

®
Intel 855GME Chipset and Intel
Schematic Checklist Summary
Table 131. GMCH Decoupling Recommendations Checklist (Sheet 1 of 2)
Pin Name
VCC[18:1]
VTTLF[21:1]
VTTHF[5:1]
VCCHL[8:1]
VCC_SM[37:1]
VCC_QSM[2:1]
VCCASM[2:1]
VCC_DVO[16:1]
VCC_ADAC[2:1]
VCC_ALVDS
VCC_DLVDS[4:1]
VCC_TXLVDS[4:1]
VCC_GPIO[2:1]
VCC_AHPLL
NOTE: Decoupling guidelines are recommendations based on our reference board design. Customers may
need to take layout and PCB board design into consideration when deciding on overall decoupling
solution.
282
®
6300ESB ICH Embedded Platform Design Guide
Configuration
0.1 µF
Connect to
150 µF
V1P35_GMCH.
10 µF
0.1 µF
Connect to VCCP 270 µF
10 µF
0.1 µF
0.1 µF
Connect to
V1P35_GMCH.
10 µF
0.1 µF
Connect to
V_2P5_SM.
150 µF
Connect to
0.1 µF
V_2P5_SM with filter
4.7 µF+1 Ω
network.
Connect to
0.1 µF
V1P35_GMCH with
100 µF
filter network.
0.1 µF
Connect to
10 µF
V_1P5_CORE.
150 µF
0.01 µF
Connect to 0.1 µF
V_1P5_CORE.
220 µF
(no stuff)
0.1 µF
Connect to
V_1P5_CORE
0.01 µF
0.1 µF
Connect to
22 µF
V_1P5_CORE
47 µF
0.1 µF
Connect to
22 µf
V_2P5_CORE
47 µF
0.1 µF
Connect to VCC3
10 µF
Connect to
0.1 µF
V1P35_GMCH
F Qty
4
Bulk decoupling is based on VR
2
solutions used on CRB design.
1
3
Bulk decoupling is based on VR
1
solutions used on CRB design.
1
Connect pins directly to caps to
5
GND.
2
Bulk decoupling is based on VR
solutions used on CRB design.
1
11
Bulk decoupling is based on VR
solutions used on CRB design.
2
0.68 µH from power supply to
1
GMCH pins. On GMCH side of
inductor: one 0.1 µF to GND,
1 each
4.7 µF + 1 Ω to GND.
1 µH from power supply to GMCH
1
pins, with caps on GMCH side of
1
inductor.
2
Bulk decoupling is based on VR
1
solutions used on CRB design.
1
Route VSSADAC to other side of
the caps, then to ground.
1
Consider a 0-ohm 0805 resistor
1 between the caps and
V_1P5_CORE.
1
This and the 220 µF cap footprint
are there in case there is noise
issue with the VGA supply.
1
Route VSSALVDS to other side of
the caps, then to ground.
1
1
Bulk decoupling is based on VR
1
solutions used on CRB design.
1
3
Bulk decoupling is based on VR
1
solutions used on CRB design.
1
1
Bulk decoupling is based on VR
solutions used on CRB design.
1
1
√
Notes