Intel
®
Pentium
®
III Processor with 512KB L2 Cache Dual Processor Platform Design Guide 7-5
NOTE:
1. For a single-ended clock source, this pin is treated as CLKREF and requires an external reference circuit. For a differential
clock source, this pin is the complimentary clock input to BCLK.
The reset signals in the new pin definitions provide an electrical keying feature for socket PGA370
processors. This feature is used to prevent operation of socket PGA370 processors in incompatible
platforms. If the Intel
®
Pentium
®
III Processor with 512KB L2 Cache is placed in an AGTL+ only
processor platform, it will be held in reset. An AGTL+ only processor will be held in reset if it is placed in
an Intel
®
Pentium
®
III Processor with 512KB L2 Cache platform. The Intel
®
Pentium
®
III Processor
(CPUID 068xh) with AGTL Capability works in both platforms and is keyed accordingly. Figure 7-4 shows
how this feature works for an Intel
®
Pentium
®
III Processor with 512KB L2 Cache in an AGTL+ only
processor platform and in an Intel
®
Pentium
®
III Processor with 512KB L2 Cache ready platform.
Z36 RSVD VCC
2.5
E21 RSVD V
CORE
DET
G37 VTT RSVD
Figure 7-4. Electrical Keying Mechanism
Table 7-1. Pin Differences List
Pin
Intel
®
Pentium
®
III
Processor with 512KB L2
Cache
Platform
AGTL+ Only Processor
Platform
NC NC RESET#
RSVD/
RESET1#
AM2 X4 AH4 AJ3
VSS VSS NCRESET#
Processor
NC NC RESET#
RSVD/
RESET1#
AM2 X4 AH4 AJ3
VSS VSS VSSRESET1#
Processor
NC NC RESET#
RSVD/
RESET1#
AM2 X4 AH4 AJ3
VSS VSS NCRESET#
Processor
NC NC RESET#
RSVD/
RESET1#
AM2 X4 AH4 AJ3
VSS VSS NCRESET#
Processor
NC NC RESET#
RSVD/
RESET1#
AM2 X4 AH4 AJ3
VSS VSS VSSRESET1#
Processor
NC NC RESET#
RSVD/
RESET1#
AM2 X4 AH4 AJ3
VSS VSS VSSRESET1#
Processor
Intel
®
Pentium
®
III Processor
with 512KB L2 Cache in an
AGTL compatible processor
platform
Intel® Pentium® III Processor
with 512KB L2 Cache in an
AGTL+ only processor
platform
To Next Page
Loading...
Need help?
General
