Preliminary Information

26237C —May 2003

AMD Athlon™ XP Processor Model 10 Data Sheet

Connect

6/B

1

2/B

Connect

Pending 2

Disconnect

5

Pending

Connect

Pending 1

3/A

Disconnect4/C

 

Condition

1

CONNECT is deasserted by the Northbridge (for a

previously sent Halt or Stop Grant special cycle).

 

Action

ACLKFWDRST is asserted by the Northbridge.

BIssue a Connect special cycle.*

2

Processor receives a wake-up event and must cancel

the disconnect request.

 

C

Return internal clocks to full speed and assert

PROCRDY.

3

Deassert PROCRDY and slow down internal clocks.

4

Processor wake-up event or CONNECT asserted by

Northbridge.

 

 

 

5

CLKFWDRST is deasserted by the Northbridge.

 

 

6

Forward clocks start three SYSCLK periods after

CLKFWDRST is deasserted.

 

Note:

*The Connect special cycle is only issued after a processor wake-up event (interrupt or STPCLK# deassertion) occurs. If the AMD Athlon™ system bus is connected so the Northbridge can probe the processor, a Connect special cycle is not issued at that time (it is only issued after a subsequent processor wake-up event).

Figure 7. Processor Connect State Diagram

Chapter 4

Power Management

17

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Image 29
AMD 27488 Connect Pending Disconnect Disconnect4/C, Disconnect request, Return internal clocks to full speed and assert