VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-21-
Pinouts
7HFKQRORJLHV ,QF
:H&
:H&RRQQHFW
QQHFW
Clock Power / Ground and Filtering
Signal Name
Pin #
I/O
Signal Description
VCCA
H21, H22
P
Power for North Bridge Clock Circuitry (2.5V ±5%). Connect to VCCI through a
ferrite bead and decouple to GNDA with 0.001Uf and 0.1Uf ceramic and 10Uf tantalum
capacitors (see “Apollo ProMedia Design Guide”).
GNDA
L21, L22
P
Ground for North Bridge Clock Circuitry.
Connect to main ground plane GND
through a ferrite bead. (see “Apollo ProMedia Design Guide”).
VCCV1
W2
P
Power for Video Clock Synthesizer 1 Analog Circuitry (2.5V ±5%). Connect to
VCCI through a ferrite bead and decouple to GNDV1 with 0.001Uf and 0.1Uf ceramic
and 10Uf tantalum capacitors (see “Apollo ProMedia Design Guide”).
GNDV1
Y1
P
Ground for Video Clock Synthesizer 1. Connect to main ground plane through a
ferrite bead.
VLF1
Y3
A
Low Pass Filter Capacitor for Video Clock Synthesizer 1.
Connect to GNDV1
through a 560Pf capacitor.
VCCV2
Y2
P
Power for Video Clock Synthesizer 2 Analog Circuitry (2.5V ±5%). Connect to
VCCI through a ferrite bead and decouple to GNDV2 with 0.001Uf and 0.1Uf ceramic
and 10Uf tantalum capacitors (see “Apollo ProMedia Design Guide”).
GNDV2
AA1
P
Ground for Video Clock Synthesizer 2. Connect to main ground plane through a
ferrite bead.
VLF2
AA2
A
Low Pass Filter Capacitor for Video Clock Synthesizer 2.
Connect to GNDV2
through a 560Pf capacitor.
PLLTST
K24
PLL Test. Pull down with 4.7K resistor for normal operation.
RAMDAC Output Power / Ground and Analog Control
Signal Name
Pin #
I/O
Signal Description
VCCS
C1
P
Power for RAMDAC Current Source Circuitry (2.5V ±5%).
Connect to VCCI
through a ferrite bead and decouple to GNDS with 0.001uF and 0.1uF ceramic and 10uF
tantalum capacitors (see “Apollo ProMedia Design Guide”).
GNDS
B1
P
Ground for RAMDAC Current Source Circuitry. Connect to main ground plane
through a ferrite bead.
COMP
E4
A
Compensation Capacitor. RAMDAC analog control. Connect to VCCS using a 0.1
uF capacitor.
IRSET
E3
A
RAMDAC Current Set Point Resistor. RAMDAC analog control. Connect to GNDS
through a 360
Ω 1% resistor.
GNDRGB
A1
P
RGB Video Output Return. Connection point for the RGB load resistors. Also used
as a shield for the RGB video output traces to the VGA display connector. Connects to
RGB return pins 6, 7, and 8 of the VGA connector. Connect to main ground plane
through a ferrite bead. Refer to the “Apollo ProMedia Design Guide” for more specific
connection and PCB layout details.
Commonly Used Prefix / Suffix Letters in Signal Names:
I = Internal Logic
A = North Bridge Clock Synthesizer
M = Memory (SDRAM) Interface
V1 = Video Clock Synthesizer PLL1
H = Host CPU Interface
V2 = Video Clock Synthesizer PLL2
P = PCI Bus Interface
D = Video Clocks Digital Data Path
G = AGP Bus (internal in ProMedia)
R = RAMDAC Digital Data Path
GM = Graphics Memory Interface
S = RAMDAC Current Source
U (or USB) = USB (Universal Serial Bus)
RGB = Analog Video Out Return
H (or HWM) = Hardware Monitoring
TV = TV Out
SUS = Suspend Power
V = TV In / Video Capture
German ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
