
64
Functional Operation
Chapter 3
AMD-8111 HyperTransport I/O Hub Data Sheet
24674
Rev. 3.00
April 2003
AMD Preliminary Information
Stop-grant.
IC issues a HyperTransport STPCLK system management message with the 3-bit
System Management Action Field (SMAF) as defined by DevB:3x70[POSSMAF]. This STPCLK
system management message is issued before the response message to the write of PM04. The IC
then waits for a Stop Grant special cycle broadcast message from the host.
CPUSLEEP_L and CPUSTOP_L
. If DevB:3x50[CSLP]=1b, DevB:3x50[CSTP]=1b, then
CPUSLEEP_L, CPUSTOP_L respectively are asserted when the IC recognizes Stop Grant special
cycle broadcast.
AGPSTOP_L.
If DevB:3x50[ASTP]=1b then AGPSTOP_L is asserted immediately after the
Stop Grant broadcast has been recognized by the IC.
DCSTOP_L.
If DevB:3x50[DCSTP]=1b the IC waits a minimum of 122
μ
s after Stop Grant is
recognized and then asserts DCSTOP_L.
SUSPEND_L.
If DevB:3x50[SUSP]=1b SUSPEND_L is asserted at the same time that
DCSTOP_L is asserted. If DCSTOP_L is not enabled SUSPEND_L assertion is delayed a
minimum of 122
μ
s from Stop Grant.
PCISTOP_L.
If DevB:3x50[PSTP]=1b after DCSTOP_L or SUSPEND_L assertion (or Stop
Grant if neither are enabled) the IC then waits at least one RTC clock before asserting
PCISTOP_L. PCI CLKRUN_L protocol is not in effect during S1.
LDTSTOP_L.
After DCSTOP_L or SUSPEND_L or PCISTOP_L (if enabled) is asserted, the IC
waits the time interval dictated by DevB:3x74[C3S1LST] then, if DevB:3x70[POSLS]=1b, the IC
asserts LDTSTOP_L.
3.7.1.6.8
Transitions From S1 (POS) to S0 (FON)
The following is the S1 resume sequence, once an enabled resume event occurs:
PCISTOP_L, CPUSLEEP_L, CPUSTOP_L.
If these signals are asserted, then they are
deasserted immediately after an enabled resume event is detected.
LDTSTOP_L.
LDTSTOP_L is deasserted immediately after an enabled resume event is
detected. See DevB:3x74[FVLST].
DCSTOP_L, SUSPEND_L.
The IC waits a programmable amount of time dictated by
DevB:3x54[PLLCNT1] after LDTSTOP_L is deasserted and then deasserts DCSTOP_L and
SUSPEND_L. If LDTSTOP_L is not asserted during S1 then the delay is from the detected
resume event.
AGPSTOP_L.
The IC waits a programmable amount of time dictated by DevB:3x54[PLLCNT]
after DCSTOP_L or SUSPEND_L or LDTSTOP_L deassertion (if DCSTOP_L or SUSPEND_L
is not used) and then deasserts AGPSTOP_L.
After the IC has deasserted AGPSTOP_L, it issues a HyperTransport STPCLK system
management message with the STPCLK bit deasserted.