VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-22-
Pinouts
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Digital Power and Ground
Signal Name
Pin #
I/O
Signal Description
VCC5
U6
P
Power for Display / Video Interfaces (5V ±5%). Power for CRT
H/VSYNC, DFP interface, video interface, and TV interface. Used to
provide adequate output voltage swing for driving external video
devices. Also used to provide 5V input tolerance from those interfaces.
VCC3
F7, F10, F12, F17, F20, G6,
G21, H6, K21, L4, L12, L15,
M11, M16, R11, R16, T4,
T12, T15, U21, W6, Y6, Y21,
AA7, AA10, AA17, AA20
P
Power for On-Board Interfaces (2.5V to 3.3V ±5%). Power for host
CPU / L2 Cache interface, PCI bus interface, and memory interface
(except pins listed below under VSUS).
VSUS3
V22, W22, AB22
P
Suspend Power (3.3V ±5%).
Power for memory interface signals
SRASC#, SCASC#, SWEC#, SWEB#, RAS[5-0]#, CAS[7-0]#, and
MECC[7-0] as well as SUSTAT# and SUSCLK. Connect to VCC3 if
suspend functions are not implemented.
VSUS2
AA22
P
Suspend Power (2.5V ±5%). Connect to VCCI if suspend functions
are not implemented.
VCCI
F9, F18, J6, J21, V6, V21,
AA9, AA18
P
Power for On-Chip Internal Logic (2.5V ±5%).
VCCD
W1
P
Power for Video Clock Synthesizer Digital Logic (2.5V ±5%).
Connect to VCCI through a ferrite bead and decouple to main ground
plane GND with 0.001uF and 0.1uF ceramic and 10uF tantalum
capacitors (see “Apollo ProMedia Design Guide”).
VCCR
D1
P
Power for RAMDAC Video Output Digital Logic (2.5V ±5%).
Connect to VCCI through a ferrite bead and decouple to main ground
plane GND with 0.001uF and 0.1uF ceramic and 10uF tantalum
capacitors (see “Apollo ProMedia Design Guide”).
VTT
E11, F19
P
CPU Interface Termination Voltage (1.5V ±10%).
GTLREF
E12, E21
P
CPU Interface GTL+ Voltage Reference. 2/3 VTT ±2%. Derived
from the termination voltage to the pullup resistors. Determines the
noise margin for the host CPU interface signals. Internally connects to
the GTL
+
sense amp on each GTL
+
input or I/O pin.
GND
A9, A18, A26, B2, C8, C14,
C19, D4, D23, F6, F13-F14,
F16, F21, H24, J26, L11, L13,
L14, L16, M12-M15, M21,
N3, N6, N11-N16, N21, P1, P6,
P11-P16, P21, R12-R15, T11,
T13, T14, T16, T21, V26,
W24, AA6, AA13-AA15,
AA21, AC4, AC23, AD8,
AD13, AD19, AF1, AF9,
AF18, AF26
P
Ground. Connect to primary PCB ground plane.
NC
A2-A5, B3-B5, C3-C5, Y5,
AA3-AA5, AB1-AB4, AC1
-
No Connect.
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