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74 Pin Descriptions Chapter 10
AMD Sempron™ Processor Model 10 with 256K L2 Cache Data Sheet 31994A —1 August 2004
VID[4:0] Pins The VID[4:0] (Voltage Identification) outputs are used to
dictate the V
CC_CORE
voltage level. The VID[4:0] pins are
strapped to ground or left unconnected on the processor
package. The VID[4:0] pins are pulled up on the motherboard
and used by the V
CC_CORE
DC/DC converter.
The VID codes and corresponding voltage levels are shown in
Table 23.
For more information, see the “Required Circuits” chapter of
the AMD Athlon™ Processor-Based Motherboard Design Guide,
order# 24363.
VREFSYS Pin VREFSYS (W5) drives the threshold voltage for the system bus
input receivers. The value of VREFSYS is system specific. In
addition, to minimize V
CC_CORE
noise rejection from VREFSYS,
include decoupling capacitors. For more information, see the
AMD Athlon™ Processor-Based Motherboard Design Guide, order#
24363.
Table 23. VID[4:0] Code to Voltage Definition
VID[4:0]
V
CC_CORE
(V)
VID[4:0]
V
CC_CORE
(V)
00000 1.850 10000 1.450
00001 1.825 10001 1.425
00010 1.800 10010 1.400
00011 1.775 10011 1.375
00100 1.750 10100 1.350
00101 1.725 10101 1.325
00111 1.675 10111 1.275
01000 1.650 11000 1.250
01001 1.625 11001 1.225
01010 1.600 11010 1.200
01011 1.575 11011 1.175
01100 1.550 11100 1.150
01101 1.525 11101 1.125
01110 1.500 11110 1.100
01111 1.475 11111 No CPU