Mobile Intel Pentium 4 Processor Supporting Hyper-Threading Technology on 90-nm Process Technology

18 Mobile Intel® Pentium® 4 Processor Supporting Hyper-Threading Technology on 90-nm Process Technology Datasheet
Electrical Specifications
2.8 Front Side Bus Frequency Select Signals
(BSEL[1:0])
The BSEL[1:0] signals are used to select the frequency of the processor input clock (BCLK[1:0]).
Table 2-6 defines the possible combinations of the signals and the frequency associated with each
combination. The required frequency is determined by the processor, chipset, and clock
synthesizer. All agents must operate at the same frequency.
The processor currently operates at a 533-MHz front side bus frequency (selected by a
133-MHz BCLK[1:0] frequency). Individual processors will only operate at their specified front
side bus frequency.
For more information about these pins refer to Section 4.2 and the appropriate platform design
guidelines.
2.9 Absolute Maximum and Minimum Ratings
Table 2-7 specifies absolute maximum and minimum ratings. Within functional operation limits,
functionality and long-term reliability can be expected.
At conditions outside functional operation condition limits, but within absolute maximum and
minimum ratings, neither functionality nor long-term reliability can be expected. If a device is
returned to conditions within functional operation limits after having been subjected to conditions
outside these limits, but within the absolute maximum and minimum ratings, the device may be
functional, but with its lifetime degraded depending on exposure to conditions exceeding the
functional operation condition limits.
At conditions exceeding absolute maximum and minimum ratings, neither functionality nor long-
term reliability can be expected. Moreover, if a device is subjected to these conditions for any
length of time then, when returned to conditions within the functional operating condition limits, it
will either not function, or its reliability will be severely degraded.
Although the processor contains protective circuitry to resist damage from static electric discharge,
precautions should always be taken to avoid high static voltages or electric fields.
Table 2-6. BSEL[1:0] Frequency Table for BCLK[1:0]
BSEL1 BSEL0 Function
L L RESERVED
L H 133 MHz
H L RESERVED
H H RESERVED