Product specifications

CN333 Data Sheet
Revision 1.0, January 5, 2005 -20- Pin Descriptions
Compensation and Reference Voltage Pin Descriptions
Compensation
Signal Name Pin # I/O Signal Description Power Plane
HRCOMP
F13 AI Host CPU Compensation. Connect a 20.5 Ω 1% resistor to ground.
Used for Host CPU interface I/O buffer calibration.
VTT
VLCOMPP
AE14 AI V-Link Compensation. Connect a 360 Ω 1% resistor to ground.
VCC15VL
AGPCOMPN
AE2 AI AGP N Compensation. Connect a 60.4 Ω 1% resistor to
VCC15AGP.
VCC15AGP
AGPCOMPP
AE1 AI AGP P Compensation. Connect a 60.4 Ω 1% resistor to ground.
VCC15AGP
Reference Voltages
Signal Name Pin # I/O Signal Description Power Plane
GTLVREF
G15 P Host CPU Interface AGTL+ Voltage Reference. 2/3 VTT ±2%
typically derived using a resistive voltage divider. See Design Guide.
VTT
HDVREF[0:1]
G10, G13,
K7, J7
P Host CPU Data Voltage Reference. 2/3 VTT ±2% typically derived
using a resistive voltage divider. See Design Guide.
VTT
HAVREF[0:1]
F18, F20 P Host CPU Address Voltage Reference. 2/3 VTT ±2% typically
derived using a resistive voltage divider. See Design Guide.
VTT
HCOMPVREF
G14 P Host CPU Compensation Voltage Reference. 1/3 VTT ±2%
typically derived using a resistive voltage divider. See Design Guide.
VTT
MEMVREF[0:5]
H26, L25,
R25, W25,
AC25, AE22
P Memory Voltage Reference. 0.5 VCC25MEM ±2% typically derived
using a resistive voltage divider. See Design Guide.
VCC25MEM
VLVREF
AE15 P V-Link Voltage Reference. 0.625V ±2% derived using a resistive
voltage divider. See Design Guide.
VCC15VL
AGPVREF[0:1]
AE13, AD6 P AGP Voltage Reference. ½ VCC15AGP (0.75V) for AGP 2.0 (4x
transfer mode) and 0.23 VCC15AGP (0.35V) for AGP 3.0 (8x transfer
mode). See the Design Guide for additional information and circuit
implementation details..
VCC15AGP