Datasheet

System Reset
8-14 Intel
®
E8870 Scalable Node Controller (SNC) Datasheet
8.3.5 SNC and SIOH and SPS: RESETI#
This pin is the hard reset input to the SNC, SPS and SIOH. It may be driven by the ICH4 PCIRST#
signal (Figure 8-8) or, if determinism is required, by system reset control logic.
Figure 8-8. Basic System Reset Distribution
Figure 8-9. Basic System Reset Timing
SPSs Processor
LPC
RESETI#
DMH
MEMRST#
LPCRST#
PWRGOOD from Power supplies
Other Resets
RESET#
Processor
RESET#
ICH4
PCIRST#
PWROK
SIOHs
P64H
P64H
P64H
PCI
Agents
RESET66#
PCIRST#
DET
P64Hs
SNCs
CPURST#
RESETO#
SPS, SIOH, SNC:
PWRGOOD
ICH4: PCIRST#,
SPS, SNC,
SIOH: RESETI#
Hub Interface
to ICH4
CPU_RST_DONE_ACK Sequence
ICH4: PWROK
SIOH: RESET66#
SYSCLK
>4000 SYSCLK
>1ms
~4000 SYSCLK (T4+T9)
CLK33, CLK66