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Rev. 1.00, 05/04, page 372 of 544
R/W
Bit Bit Name
Initial
Value
Slave Host Description
4 FGA20E 0 R/W — Fast A20 Gate Function Enable
Enables or disables the fast A20 gate function. When
the fast A20 gate is disabled, the normal A20 gate can
be implemented by firmware operation of the P81
output.
When the fast A20 gate function is enabled, the DDR bit
for P81 must not be set to 1.
0: Fast A20 gate function disabled
• Other function of pin P81 is enabled
• GA20 output internal state is initialized to 1
1: Fast A20 gate function enabled
• GA20 pin output is open-drain (external VCC pull-up
resistor required)
3 SDWNE 0 R/W — LPC Software Shutdown Enable
Controls host interface shutdown. For details of the LPC
shutdown function, and the scope of initialization by an
LPC reset and an LPC shutdown, see section 15.4.4,
Host Interface Shutdown Function (LPCPD).
0: Normal state, LPC software shutdown setting enabled
[Clearing conditions]
• Writing 0
• LPC hardware reset or LPC software reset
• LPC hardware shutdown release (rising edge of
LPCPD signal)
1: LPC hardware shutdown state setting enabled
• Hardware shutdown state when LPCPD signal is low
[Setting condition]
• Writing 1 after reading SDWNE = 0