參數(shù)資料
型號(hào): 37B77X
廠商: SMSC Corporation
英文描述: ENHANCED SUPER I/O CONTROLLER WITH WAKE UP FEATURES
中文描述: 增強(qiáng)型超I / O與向上特征喚醒控制器
文件頁(yè)數(shù): 38/196頁(yè)
文件大?。?/td> 573K
代理商: 37B77X
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132
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 is sent to the chip's CONFIG
PORT. The config key consists of 0x55 written
to the CONFIG PORT. Once the configuration
key is received correctly the chip enters into the
Configuration State (The auto Config ports are
enabled).
Configuration Mode
The system sets the logical device information
and activates desired logical devices through
the INDEX and DATA ports. 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
b. Write
the
address
of
the
desired
configuration
register
within
the
logical
device to the INDEX PORT and then write or
read the configuration register through the
DATA PORT.
Note: If accessing the Global Configuration
Registers, step (a) is not required.
Exit Configuration Mode
To exit the Configuration State the system writes
0xAA to the CONFIG PORT. The chip returns
to the RUN State.
Note: Only two states are defined (Run and
Configuration).
In the Run State the chip will
always be ready to enter the Configuration
State.
Programming Example
The following is an example of a configuration
program in Intel 8086 assembly language.
;----------------------------.
; ENTER CONFIGURATION MODE
|
;----------------------------'
MOV
DX,3F0H
MOV
AX,055H
OUT
DX,AL
;----------------------------.
; CONFIGURE REGISTER CRE0,
|
; LOGICAL DEVICE 8
|
;----------------------------'
MOV
DX,3F0H
MOV
AL,07H
OUT
DX,AL
;Point
to
LD#
Config
Reg
MOV
DX,3F1H
MOV
AL, 08H
OUT
DX,AL;Point to Logical Device 8
;
MOV
DX,3F0H
MOV
AL,E0H
OUT
DX,AL
; Point to CRE0
MOV
DX,3F1H
MOV
AL,02H
OUT
DX,AL
; Update CRE0
;-----------------------------.
; EXIT CONFIGURATION MODE
|
;-----------------------------'
MOV
DX,3F0H
MOV
AX,0AAH
OUT
DX,AL
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