SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 278

• Manufacturer Part Number: SCH3112I-NE
• Description: LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
• Manufacturer: SMSC [SMSC Corporation]

Rev 0.2 (09-28-04)
24.2.52
24.2.53
24.2.54
Register
Address
Register
Address
Register
Address
AEh
AFh
B3h
B4h
ADh
Read/
Read/
Read/
Write
Write
Write
R/W
R/W
R/W
R/W
For bits[1:0], these bits are defined as RESERVED. Writes have no affect, reads return 00.
Register ADh: SMSC Test Register
This is a read-only smsc test register. Writing to this register has no effect.
Registers AE-AFh, B3h: Top Temperature Limit Registers
Note: These registers are reset to their default values when the powergood_ps signal transitions
This register becomes read only when the Lock bit is set. Any further attempts to write to this register
shall have no effect.
The Top Temperature Registers define the upper bound of the operating temperature for each zone.
If the temperature of the zone exceeds this value, the minimum temperature for the zone can be
configured to be adjusted down.
The Top Temperature registers are used as a comparison point for the AMTA feature, to determine if
the Low Temp Limit register for a zone should be adjusted down. The Top temp register for a zone is
not used if the AMTA feature is not enabled for the zone. The AMTA feature is enabled via the Tmin
Adjust Enable register at 0B7h.
Register B4h: Min Temp Adjust Temp RD1, RD2 (Zones 1& 3)
This register becomes read only when the Lock bit is set. Any further attempts to write to this register
shall have no effect.
Bits[7:4] are used to select the temperature adjustment values that are subtracted from the Zone Low
temp limit for zones 1& 3. There is a 2-bit value for each of the remote zones that is used to program
the value that is subtracted from the low temp limit temperature register when the temperature reading
for the zone reaches the Top Temperature for the AMTA feature. The AMTA feature is enabled via the
Tmin Adjust Enable register at B7h.
These bits are defined as follows: ZxATP[1:0]:
R
00=2oC (default)
01=4oC
10=6oC
11=8oC
Top Temperature Remote Diode 1
Top Temperature Remote Diode 2
high.
Min Temp Adjust Temp RD1,
Top Temperature Ambient
SMSC Test Register
RD2 (Zones 1&3)
Register Name
Register Name
Register Name
(Zone 1)
(Zone 3)
(Zone 2)
(MSb)
Bit 7
(MSb)
R1AT
Bit 7
DATASHEET
P1
7
LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
(MSb)
Bit 7
7
7
7
Bit 6
262
R1AT
Bit 6
6
P0
Bit 6
6
6
6
Bit 5
R2AT
Bit 5
5
P1
Bit 5
5
5
5
Bit 4
R2AT
Bit 4
P0
4
Bit 4
4
4
4
Bit 3
Bit 3
RES
3
Bit 3
3
3
3
Bit 2
Bit 2
RES
Bit 2
2
2
2
2
Bit 1
Bit 1
Bit 1
RES
1
1
1
1
(LSb)
Bit 0
(LSb)
SMSC SCH311X
Bit 0
(LSb)
Bit 0
RES
0
0
0
0
Datasheet
Default
Value
Default
Default
00h
Value
Value
2Dh
2Dh
2Dh
00h