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Intel
®
E8870 Scalable Node Controller (SNC) Datasheet 8-3
System Reset
8.2.1 Power-up Reset Sequence
The following sections define the timing required of external E8870 chipset signals at power-up.
The power-up sequence is described in 3 phases: PWRGOOD deassertion, PWRGOOD assertion,
and hard reset deassertion. Each component must see this timing at power-up, although they may
not see the sequence at the same time. For example, if an SNC is hot-plugged, system logic on the
hot-plug module must drive the SNC RESETI# pin as specified, but the connected SPS will be out
of reset and operating normally.
Figure 8-1 shows the E8870 chipset power-up timing.
Figure 8-2 shows the timing for a hard reset deassertion.
Table 8-3 specifies the timings drawn in Figure 8-1 and Figure 8-2. Nominal clock frequencies are
described. Specifications still hold for de-rated clock frequencies.
Figure 8-1. Power-up Reset Timing
T1=10ms
T3
PWRGOOD
RESETI#
Figure 8-2. Hard Reset Deassertion Timing
T9
T12
T7
ICH4 CPU_RST_DONE_ACK Sequence
RESETI#
CPU RESET# (if asserted)
Hard Reset De-Assertion
BNR# (if asserted for BINIT#)
MEMRST# (if asserted)
LPCRST#
Hub Interface to ICH4
RESET66#
T4
T10
T5
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