Intel ULV 353 LE80536VC900512 Data Sheet

283654-003 Datasheet 

 

 

15 

The processor will return to the Stop Grant state after the completion of a BINIT# bus 
initialization unless STPCLK# has been deasserted. RESET# assertion will cause the processor to 
immediately initialize itself, but the processor will stay in the Stop Grant state after initialization 
until STPCLK# is deasserted. A transition to the Sleep state can be made by the assertion of the 
SLP# signal.  

While in the Stop Grant state, assertions of FLUSH#, SMI#, INIT#, INTR, and NMI (or 
LINT[1:0]) will be latched by the processor. These latched events will not be serviced until the 
processor returns to the Normal state. Only one of each event will be recognized upon return to the 
Normal state.  

This is a mode entered by the processor with the assertion of the STPCLK# signal when it is 
configured for the Quick Start state (via the A15# strapping option). In the Quick Start state the 
processor is only capable of acting on snoop transactions generated by the system bus priority 
device. Because of its snooping behavior, Quick Start can only be used in a uniprocessor (UP) 
configuration.  

A transition to the Deep Sleep state can be made by stopping the clock input to the processor. A 
transition back to the Normal state (from the Quick Start state) is made only if the STPCLK# 
signal is deasserted. 

While in this state the processor is limited in its ability to respond to input. It is incapable of 
latching any interrupts, servicing snoop transactions from symmetric bus masters or responding to 
FLUSH# or BINIT# assertions. While the processor is in the Quick Start state, it will not respond 
properly to any input signal other than STPCLK#, RESET#, or BPRI#. If any other input signal 
changes, then the behavior of the processor will be unpredictable. No serial interrupt messages 
may begin or be in progress while the processor is in the Quick Start state.  

RESET# assertion will cause the processor to immediately initialize itself, but the processor will 
stay in the Quick Start state after initialization until STPCLK# is deasserted. 

The processor will respond to snoop transactions on the system bus while in the Auto Halt, Stop 
Grant, or Quick Start state. When a snoop transaction is presented on the system bus the processor 
will enter the HALT/Grant Snoop state. The processor will remain in this state until the snoop has 
been serviced and the system bus is quiet. After the snoop has been serviced, the processor will 
return to its previous state. If the HALT/Grant Snoop state is entered from the Quick Start state, 
then the input signal restrictions of the Quick Start state still apply in the HALT/Grant Snoop 
state, except for those signal transitions that are required to perform the snoop. 

The Sleep state is a very low-power state in which the processor maintains its context and the 
phase-locked loop (PLL) maintains phase lock. The Sleep state can only be entered from the Stop 
Grant state. After entering the Stop Grant state, the SLP# signal can be asserted, causing the 
processor to enter the Sleep state. The SLP# signal is not recognized in the Normal or Auto Halt 
states.