參數(shù)資料
型號(hào)： pentium processor with MMX
廠商： Intel Corp.
英文描述： 32-bit processor with MMX technology(32位帶MMX技術(shù)處理器)
中文描述： 32位MMX技術(shù)（32位帶MMX公司的技術(shù)處理器處理器）
文件頁(yè)數(shù)： 28/51頁(yè)
文件大?。?/td> 479K
代理商： PENTIUM PROCESSOR WITH MMX
PENTIUM PROCESSOR WITH MMX TECHNOLOGY
E
28
5/23/97 10:47 AM 24318502.DOC
3.0.
ELECTRICAL SPECIFICATIONS
This section describes the electrical differences
between
the
Pentium
technology
and
the
133/150/166/200, as well as the AC and DC
specifications of the Pentium processor with MMX
technology.
processor
Pentium
with
processor
MMX
3.1.
Electrical Characteristics and
Differences between the
Pentium
Processor with
MMX Technology and the
Pentium Processor
133/150/166/200
When designing a Pentium processor with MMX
technology system from a Pentium processor
133/150/166/200 system, there are a number of
electrical differences that require attention. Designing
a single motherboard that supports various members
of the Pentium processor family including the
Pentium processor with MMX technology, Pentium
processor 133/150/166/200, Pentium OverDrive
processor, or future Pentium OverDrive processor
can be easily accomplished. Refer to the Pentium
Processor Flexible Motherboard Design Guidelines
application note (Order Number 243187) for more
information and specific implementation examples.
The following sections highlight key electrical issues
pertaining to the Pentium processor with MMX
technology power supplies, connection specifications
and buffer models.
3.1.1.
POWER SUPPLIES
The main electrical difference between the Pentium
processor with MMX technology and the Pentium
processor 133/150/166/200 is the operating voltage.
The Pentium processor with MMX technology
requires two separate voltage inputs, V
CC2
and V
CC3
.
The V
CC2
pins supply power to the Pentium
processor with MMX technology core, while the V
CC3
pins supply power to the processor I/O pins.
The Pentium processor 133/150/166/200, on the
other hand, requires a single voltage supply for all
V
CC
pins. This single supply powers both the core
and
I/O
pins
of
the
133/150/166/200.
Pentium
processor
By connecting all of the V
CC2
pins together and all
the V
CC3
pins together on separate power islands,
Pentium processor 133/150/166/200 designs can
easily be converted to support the Pentium
processor with MMX technology. In order to maintain
compatibility
with
133/150/166/200-based
platforms,
processor with MMX technology supports the
standard 3.3V specification on its V
CC3
pins.
Pentium
processor
Pentium
the
3.1.1.1.
Power Supply Sequencing
There is no specific power sequence required for
powering up or powering down the separate V
CC2
and V
CC3
supplies of the Pentium processor with
MMX technology. It is recommended that the V
CC2
and V
CC3
supplies be either both ON or both OFF
within one second of each other.
3.1.2.
CONNECTION SPECIFICATIONS
Connection specifications for the power and ground
inputs, 3.3V inputs and outputs, and the NC/INC and
unused inputs are discussed in the following
sections.
3.1.2.1.
Power and Ground
For clean on-chip power distribution, the Pentium
processor with MMX technology in PPGA and SPGA
packages has 28 V
CC3
(I/O power), 25 V
CC2
(core
power) and 53 V
SS
(ground) inputs. Power and
ground connections must be made to all external V
CC
and V
SS
pins of the Pentium processor with MMX
technology. On the circuit board all V
CC3
pins must
be connected to a 3.3V V
CC
plane. All V
CC2
pins
must be connected to a 2.8V V
CC
plane. All V
SS
pins
must be connected to a V
SS
plane.
3.1.2.1.1.
V
and V
Measurement
Specification
The values of V
CC2
and V
CC3
should be measured at
the bottom side of the processor pins using an
oscilloscope with a 3 dB bandwidth of at least
20 MHz (100 MS/s digital sampling rate). There
should be a short isolation ground lead attached to a
processor pin on the bottom side of the board.
The measurement should be taken at the following
V
/V
pairs: AN13/AM10, AN21/AM18, AN29/
AM26, AC37/Z36, U37/R36, L37/H36, A25/B28,
A17/B20, A7/B10, G1/K2, S1/V2, AC1/Z2. One-half
of these pins are V
CC2
while the others are V
CC3
; the
operating ranges for the V
CC2
and V
CC3
pins are
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