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16 Power Management Chapter 4
AMD Athlon™ XP Processor Model 8 Data Sheet 25175H—March 2003
Preliminary Information
Connect State
Diagram
Figure 6 below and Figure 7 on page 17 show the Northbridge
and processor connect state diagrams, respectively.
Figure 6. Northbridge Connect State Diagram
Condition
1 A disconnect is requested and probes are still pending.
2 A disconnect is requested and no probes are pending.
3 A Connect special cycle from the processor.
4 No probes are pending.
5 PROCRDY is deasserted.
6 A probe needs service.
7 PROCRDY is asserted.
8
Three SYSCLK periods after CLKFWDRST is deasserted.
Although reconnected to the system interface, the
Northbridge must not issue any non-NOP SysDC
commands for a minimum of four SYSCLK periods after
deasserting CLKFWDRST.
Action
A
Deassert CONNECT eight SYSCLK periods
after last SysDC sent.
B Assert CLKFWDRST.
C Assert CONNECT.
D Deassert CLKFWDRST.
Disconnect
Pending
Connect
Disconnect
Requested
Reconnect
Pending
Probe
Pending 2
Disconnect
Probe
Pending 1
1
3
2/A
4/A
5/B
3/C
7/D,C
8
6/C 7/D
8