AMD Geode SC2200 User Manual
Page 49
AMD Geode™ SC2200 Processor Data Book
53
32580B
X32I
AJ2
I/O
Crystal Connections. Connected directly to a 32.768
KHz crystal. This clock input is required even if the inter-
nal RTC is not being used. Some of the internal clocks
are derived from this clock. If an external clock is used, it
should be connected to X32I, using a voltage level of 0
volts to V
CORE
+10% maximum. X32O should remain
unconnected.
---
X32O
AJ3
---
X27I
AG3
I/O
Crystal Connections. Connected directly to a
27.000 MHz crystal. Some of the internal clocks are
derived from this clock. If an external clock is used, it
should be connected to X27I, using a voltage level of 0
volts to V
IO
and X27O should be remain unconnected.
---
X27O
AH2
---
CLK27M
AA4
O
27 MHz Output Clock. Output of crystal oscillator.
IDE_DATA5
PCIRST#
A6
O
PCI and System Reset. PCIRST# is the reset signal for
the PCI bus and system. It is asserted for approximately
100 µs after POR# is negated.
---
3.4.1
System Interface (Continued)
Signal Name
Ball No.
Type
Description
Mux