cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 496

• Manufacturer Part Number: cs5535
• Description: Geode Cs5535 Companion Multi-function South Bridge
• Manufacturer: National Semiconductor Corporation

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PMC Register Descriptions
5.18.3.15 PM Thermal-Safe Delay and Enable (PM_TSD)
PMS I/O Offset
Type
Reset Value
Reads always return the value written, except for RSVD bits [29:20].
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
29:20
29:20
19:0
Bit
Bit
31
30
31
30
Name
PWRBUT_LOCK
PWRBUT_EN
RSVD
PWRBUT_DELAY
Name
THRM_LOCK
THRM_EN
RSVD
44h
R/W
00000000h
RSVD
RSVD
Description
Power Button Lock. After this bit is set, the value in this register can not be changed
until RESET_STAND# is applied.
Power Button Enable. Must be high to enable the fail-safe function.
Reserved. By convention write 0, but may write anything. Reads return 0.
Power Button Delay. If the Power Button (PWR_BUT#) input signal is asserted for
PWRBUT_DELAY number of 32 kHz clock edges, then unconditionally de-assert
WORKING and WORK_AUX to remove Working power. If PWR_BUT# is still asserted
at wakeup, hold in Standby state until de-asserted.
PWR_BUT# needs to be asserted for at least one 32 kHz clock edge for this function to
work properly. A less than one 32 kHz clock edge pulse on PWR_BUT# may not be
registered.
The delay restarts if PWR_BUT# de-asserts and then asserts again. If PWR_BUT# is
already asserted, the delay restarts anytime PWRBUT_DELAY (this field) is written.
Description
Thermal Lock. After this bit is set, the value in this register can not be changed until
RESET_STAND# is applied.
Thermal Enable. Must be high to enable the thermal alarm function.
Reserved. By convention write 0, but may write anything. Reads return 0 value.
(Continued)
PM_FSD Bit Descriptions
PM_TSD Bit Descriptions
PM_FSD Register Map
PM_TSD Register Map
496
PWRBUT_DELAY
THRM_DELAY
9
9
8
8
7
7
6
6
5
5
4
4
3
3
2
2
Revision 0.8
1
1
0
0