AMD ATHLON 8 Datasheet page 58

AMD Athlon™ XP Processor Model 8 Data Sheet
46
Preliminary Information
Power-Up Timing Requirements. The signal timing requirements are
as follows:
1. RESET# must be asserted before PWROK is asserted.
The AMD Athlon XP processor model 8 does not set the
correct clock multiplier if PWROK is asserted prior to a
RESET# assertion. It is recommended that RESET# be
asserted at least 10 nanoseconds prior to the assertion of
PWROK.
In practice, a Southbridge asserts RESET# milliseconds
before PWROK is asserted.
2. All motherboard
specification before PWROK is asserted.
PWROK is an output of the voltage regulation circuit on the
motherboard. PWROK indicates that V
other voltage planes in the system are within specification.
The motherboard is required to delay PWROK assertion for
a minimum of three milliseconds from the 3.3 V supply
being within specification. This delay ensures that the
system clock (SYSCLK/SYSCLK#) is operating within
specification when PWROK is asserted.
The processor core voltage, V
specification as dictated by the VID[4:0] pins driven by the
processor before PWROK is asserted. Before PWROK
assertion, the AMD Athlon processor is clocked by a ring
oscillator.
The processor PLL is powered by VCCA. The processor PLL
does not lock if VCCA is not high enough for the processor
logic to switch for some period before PWROK is asserted.
VCCA must
microseconds before PWROK is asserted.
In practice VCCA, V
must be within specification for several milliseconds before
PWROK is asserted.
After PWROK is asserted, the processor PLL locks to its
operational frequency.
3. The system clock (SYSCLK/SYSCLK#) must be running
before PWROK is asserted.
When PWROK is asserted, the processor switches from
driving the internal processor clock grid from the ring
oscillator to driving from the PLL. The reference system
Signal and Power-Up Requirements
voltage planes
CC_CORE
be within specification
, and all other voltage planes
CC_CORE
25175H—March 2003
must be within
and all
CC_CORE
, must be within
at least five
Chapter 9