Intel T5470 LF80537GG0252M Data Sheet

Datasheet

15

Deep Power Down Technology state is a new, power-saving state which is being 

implemented on the processor. In Deep Power Down Technology the processor saves its 

entire architectural state onto an on-die SRAM hence allowing it to lower its main core 

voltage to any value, even as low as 0-V.

When the core enters Deep Power Down Technology state, it saves the processor state 

that is relevant to the processor context in an on-die SRAM that resides on a separate 

power plane V

CCP

 (I/O power supply). This allows the main core Vcc to be lowered to 

any arbitrary voltage including 0-V. The on-die storage for saving the processor state is 

implemented as a per-core SRAM. 

This is the normal operating state for the processor. The processor remains in the 

Normal state when at least one of its cores is in the C0, C1/AutoHALT, or C1/MWAIT 

state.

When the STPCLK# pin is asserted, each core of the dual-core processor enters the 

Stop-Grant state within 20 bus clocks after the response phase of the processor-issued 

Stop-Grant Acknowledge special bus cycle. Processor cores that are already in the C2, 

C3, or C4 state remain in their current low-power state. When the STPCLK# pin is 

deasserted, each core returns to its previous core low-power state. 

Since the AGTL+ signal pins receive power from the FSB, these pins should not be 

driven (allowing the level to return to V

CCP

) for minimum power drawn by the 

termination resistors in this state. In addition, all other input pins on the FSB should be 

driven to the inactive state.

RESET# causes the processor to immediately initialize itself, but the processor will stay 

in Stop-Grant state. When RESET# is asserted by the system, the STPCLK#, SLP#, 

DPSLP#, and DPRSTP# pins must be deasserted prior to RESET# deassertion as per AC 

Specification T45. When re-entering the Stop-Grant state from the Sleep state, 

STPCLK# should be deasserted after the deassertion of SLP# as per AC Specification 

T75.

While in Stop-Grant state, the processor will service snoops and latch interrupts 

delivered on the FSB. The processor will latch SMI#, INIT# and LINT[1:0] interrupts 

and will service only one of each upon return to the Normal state.

The PBE# signal may be driven when the processor is in Stop-Grant state. PBE# will be 

asserted if there is any pending interrupt or Monitor event latched within the processor. 

Pending interrupts that are blocked by the EFLAGS.IF bit being clear will still cause 

assertion of PBE#. Assertion of PBE# indicates to system logic that the entire processor 

should return to the Normal state.

A transition to the Stop-Grant Snoop state occurs when the processor detects a snoop 

on the FSB (see 

). A transition to the Sleep state (see 

) 

occurs with the assertion of the SLP# signal.