E
Pentium
OverDrive
PROCESSOR WITH MMX
TECHNOLOGY
57
9/8/97 11:55 AM 29060701.DOC
PRELIMINARY
7.0.
THERMAL SPECIFICATIONS
The Pentium OverDrive processor with MMX
technology is shipped with an attached fan/heatsink
for a complete thermal solution for the processor
upgrade. The fan/heatsink cooling solution will
properly cool the Pentium OverDrive processor with
MMX technology provided the space requirements of
Section 6.2 are met and the maximum air
temperature entering the fan/heatsink (T
A
) does not
exceed 45°C. The fan/heatsink inlet temperature (T
A
)
is measured 0.3” above the centerline of the fan hub
at
the
system
maximum
temperature (see Figure 15).
ambient
operating
8.0.
TESTABILITY
8.1.
Introduction
This section describes the features which are
included in the Pentium OverDrive processor with
MMX technology for purposes of testability of the
part. The testability features provided for the original
Pentium processor are also available on the Pentium
OverDrive processor with MMX technology. The
Pentium OverDrive processor with MMX technology
however, does not support the IEEE Standard
1149.1 boundary scan using the Test Access Port
(TAP) and TAP Controller as described in Chapters
11 and 27 of the Pentium
Volume 1 Contact your Intel representative for
further details. Some features of testability are
described below.
Family User’s Manual,
8.2.
Built in Self Test (BIST)
Self test is initiated by driving the INIT pin high when
RESET transitions from high to low. No bus cycles
are run by the Pentium OverDrive processor with
MMX technology during self test. The duration of self
test is approximately 2
approximately 70% of the devices in the Pentium
OverDrive processor with MMX technology.
clocks. BIST is used to test
The Pentium OverDrive processor with MMX
technology BIST consists of two parts: hardware self
test and microcode self test. During the hardware
portion of BIST, the microcode and the large PLAs
are tested. All possible input combinations of the
microcode ROM and PLAs are tested. The
microcode self test is done by comparing the stored
value of ROM check sums with the result of the self
test.
If a mismatch occurs or errors are detected during
BIST, the Pentium OverDrive processor with MMX
technology will assert the IERR# pin and attempt to
shutdown.
8.3.
Tri-State Test Mode
When the FLUSH# pin is sampled low in the clock
prior to the RESET pin going from high to low, the
Pentium OverDrive processor with MMX technology
enters tristate test mode. The Pentium OverDrive
processor with MMX technology floats all of its output
pins and bi-directional pins including pins which are
never floated during normal operation (except TD0).
Tristate test mode can be initiated in order to facilitate
testing of board connections. The Pentium OverDrive
processor with MMX technology remains in tristate
test mode until the RESET pin is toggled again.