Product specifications

VT8601A Apollo PLE133
Revision 1.82 October 22, 2001 -21- Pinouts
Technologies, Inc.
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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 PLE133 Design Guide”).
GNDA
L21, L22 P Ground for North Bridge Clock Circuitry. Connect to main ground plane GND
through a ferrite bead. (see “Apollo PLE133 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 PLE133 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 PLE133 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 I 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 PLE133 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 360Ω 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 PLE133 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 PLE133) 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