========================
Supported chips:
+
* SMSC LPC47B397-NC
+
* SMSC SCH5307-NS
+
* SMSC SCH5317
+
Prefix: 'smsc47b397'
+
Addresses scanned: none, address read from Super I/O config space
+
Datasheet: In this file
-Authors: Mark M. Hoffman <mhoffman@lightlink.com>
- Utilitek Systems, Inc.
+Authors:
+
+ - Mark M. Hoffman <mhoffman@lightlink.com>
+ - Utilitek Systems, Inc.
November 23, 2004
-The following specification describes the SMSC LPC47B397-NC[1] sensor chip
+The following specification describes the SMSC LPC47B397-NC [1]_ sensor chip
(for which there is no public datasheet available). This document was
provided by Craig Kelly (In-Store Broadcast Network) and edited/corrected
by Mark M. Hoffman <mhoffman@lightlink.com>.
-[1] And SMSC SCH5307-NS and SCH5317, which have different device IDs but are
-otherwise compatible.
+.. [1] And SMSC SCH5307-NS and SCH5317, which have different device IDs but are
+ otherwise compatible.
-* * * * *
+-------------------------------------------------------------------------
-Methods for detecting the HP SIO and reading the thermal data on a dc7100.
+Methods for detecting the HP SIO and reading the thermal data on a dc7100
+-------------------------------------------------------------------------
The thermal information on the dc7100 is contained in the SIO Hardware Monitor
(HWM). The information is accessed through an index/data pair. The index/data
Reading temperature information.
The temperature information is located in the following registers:
+
+=============== ======= =======================================================
Temp1 0x25 (Currently, this reflects the CPU temp on all systems).
Temp2 0x26
Temp3 0x27
Temp4 0x80
+=============== ======= =======================================================
Programming Example
-The following is an example of how to read the HWM temperature registers:
-MOV DX,480H
-MOV AX,25H
-OUT DX,AL
-MOV DX,481H
-IN AL,DX
+The following is an example of how to read the HWM temperature registers::
+
+ MOV DX,480H
+ MOV AX,25H
+ OUT DX,AL
+ MOV DX,481H
+ IN AL,DX
AL contains the data in hex, the temperature in Celsius is the decimal
equivalent.
Reading tach information.
The fan speed information is located in the following registers:
+
+=============== ======= ======= =================================
LSB MSB
Tach1 0x28 0x29 (Currently, this reflects the CPU
fan speed on all systems).
Tach2 0x2A 0x2B
Tach3 0x2C 0x2D
Tach4 0x2E 0x2F
+=============== ======= ======= =================================
-Important!!!
-Reading the tach LSB locks the tach MSB.
-The LSB Must be read first.
+.. Important::
+
+ Reading the tach LSB locks the tach MSB.
+ The LSB Must be read first.
+
+How to convert the tach reading to RPM
+--------------------------------------
-How to convert the tach reading to RPM.
The tach reading (TCount) is given by: (Tach MSB * 256) + (Tach LSB)
The SIO counts the number of 90kHz (11.111us) pulses per revolution.
RPM = 60/(TCount * 11.111us)
-Example:
-Reg 0x28 = 0x9B
-Reg 0x29 = 0x08
+Example::
+
+ Reg 0x28 = 0x9B
+ Reg 0x29 = 0x08
TCount = 0x89B = 2203
Obtaining the SIO version.
-CONFIGURATION SEQUENCE
+Configuration Sequence
+----------------------
+
To program the configuration registers, the following sequence must be followed:
1. Enter Configuration Mode
2. Configure the Configuration Registers
3. Exit Configuration Mode.
Enter Configuration Mode
+^^^^^^^^^^^^^^^^^^^^^^^^
+
To place the chip into the Configuration State The config key (0x55) is written
to the CONFIG PORT (0x2E).
Configuration Mode
+^^^^^^^^^^^^^^^^^^
+
In configuration mode, the INDEX PORT is located at the CONFIG PORT address and
the DATA PORT is at INDEX PORT address + 1.
The desired configuration registers are accessed in two steps:
+
a. Write the index of the Logical Device Number Configuration Register
(i.e., 0x07) to the INDEX PORT and then write the number of the
desired logical device to the DATA PORT.
logical device to the INDEX PORT and then write or read the config-
uration register through the DATA PORT.
-Note: If accessing the Global Configuration Registers, step (a) is not required.
+Note:
+ If accessing the Global Configuration Registers, step (a) is not required.
Exit Configuration Mode
+^^^^^^^^^^^^^^^^^^^^^^^
+
To exit the Configuration State the write 0xAA to the CONFIG PORT (0x2E).
The chip returns to the RUN State. (This is important).
Programming Example
-The following is an example of how to read the SIO Device ID located at 0x20
-
-; ENTER CONFIGURATION MODE
-MOV DX,02EH
-MOV AX,055H
-OUT DX,AL
-; GLOBAL CONFIGURATION REGISTER
-MOV DX,02EH
-MOV AL,20H
-OUT DX,AL
-; READ THE DATA
-MOV DX,02FH
-IN AL,DX
-; EXIT CONFIGURATION MODE
-MOV DX,02EH
-MOV AX,0AAH
-OUT DX,AL
+^^^^^^^^^^^^^^^^^^^
+
+The following is an example of how to read the SIO Device ID located at 0x20:
+
+ ; ENTER CONFIGURATION MODE
+ MOV DX,02EH
+ MOV AX,055H
+ OUT DX,AL
+ ; GLOBAL CONFIGURATION REGISTER
+ MOV DX,02EH
+ MOV AL,20H
+ OUT DX,AL
+ ; READ THE DATA
+ MOV DX,02FH
+ IN AL,DX
+ ; EXIT CONFIGURATION MODE
+ MOV DX,02EH
+ MOV AX,0AAH
+ OUT DX,AL
The registers of interest for identifying the SIO on the dc7100 are Device ID
(0x20) and Device Rev (0x21).
The Device ID will read 0x6F (0x81 for SCH5307-NS, and 0x85 for SCH5317)
The Device Rev currently reads 0x01
-Obtaining the HWM Base Address.
+Obtaining the HWM Base Address
+------------------------------
+
The following is an example of how to read the HWM Base Address located in
-Logical Device 8.
-
-; ENTER CONFIGURATION MODE
-MOV DX,02EH
-MOV AX,055H
-OUT DX,AL
-; CONFIGURE REGISTER CRE0,
-; LOGICAL DEVICE 8
-MOV DX,02EH
-MOV AL,07H
-OUT DX,AL ;Point to LD# Config Reg
-MOV DX,02FH
-MOV AL, 08H
-OUT DX,AL;Point to Logical Device 8
-;
-MOV DX,02EH
-MOV AL,60H
-OUT DX,AL ; Point to HWM Base Addr MSB
-MOV DX,02FH
-IN AL,DX ; Get MSB of HWM Base Addr
-; EXIT CONFIGURATION MODE
-MOV DX,02EH
-MOV AX,0AAH
-OUT DX,AL
+Logical Device 8::
+
+ ; ENTER CONFIGURATION MODE
+ MOV DX,02EH
+ MOV AX,055H
+ OUT DX,AL
+ ; CONFIGURE REGISTER CRE0,
+ ; LOGICAL DEVICE 8
+ MOV DX,02EH
+ MOV AL,07H
+ OUT DX,AL ;Point to LD# Config Reg
+ MOV DX,02FH
+ MOV AL, 08H
+ OUT DX,AL;Point to Logical Device 8
+ ;
+ MOV DX,02EH
+ MOV AL,60H
+ OUT DX,AL ; Point to HWM Base Addr MSB
+ MOV DX,02FH
+ IN AL,DX ; Get MSB of HWM Base Addr
+ ; EXIT CONFIGURATION MODE
+ MOV DX,02EH
+ MOV AX,0AAH
+ OUT DX,AL
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