Pinout Changes; Package Comparisons; Pin Differences List - Intel Pentium III Design Manual

further from the socket, so larger heatsink clips may be needed. Please refer to the Intel
Processor with 512KB L2 Cache Datasheet for more detailed information about the FC-PGA2
mechanical design.
Figure 7-3. Package Comparisons
49.5mm square 49.5mm square
7.4

Pinout Changes

® ®
The Intel Pentium III Processor with 512KB L2 Cache uses the same PGA370 socket that AGTL+ only
processors use. No changes to this socket should be needed to create an Intel
with 512KB L2 Cache platform.
However, several of the pin definitions for the Intel
changed from their AGTL+ only processor definitions. A summary of these changes are provided in
Table 7-1. The platform must implement the pinout changes shown below to be compatible with the
® ®
Intel Pentium III Processor with 512KB L2 Cache.
Table 7-1. Pin Differences List
® ®
7-4 Intel Pentium
FC-PGA FC-PGA
1.9mm 1.9mm
370 Pins 370 Pins
Intel
Processor with 512KB L2
Pin
AL1
AF36
AG1
AM2
AN3
AJ3
X4
AK4
AK22
Y33
N37
X34
AK36
AD36
AB36
III Processor with 512KB L2 Cache Dual Processor Platform Design Guide
FC-PGA2 FC-PGA2
3.2mm 3.2mm
49.5mm square 49.5mm square
370 Pins 370 Pins
® ®
Pentium III Processor with 512KB L2 Cache have
® ®
Pentium III
Cache
Platform
RSVD
DETECT
VTT
KEY
DYN_OE
RESET#2
VSS
VTT_PWRGD
V
CMOSREF
1
BCLK#/CLKREF
NCHCTRL
VTT
VID25MV
VTT
VTT
®
Pentium
3.5mm 3.5mm
3.2mm 3.2mm
® ®
Pentium III Processor
AGTL+ Only Processor
Platform
VSS
GND
EDGCTRL
RSVD
VSS
VSS
RESET2#
VSS
VREF7
CLKREF
RSVD
VCC
CORE
VSS
VCC
1.5
VCC
CMOS
®
III