參數(shù)資料
型號: 37C669
廠商: SMSC Corporation
英文描述: DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL
中文描述: 電腦98/99順從超級I / O軟盤控制器與紅外線支持
文件頁數(shù): 79/164頁
文件大?。?/td> 621K
代理商: 37C669
21
STATUS REGISTER B (SRB)
Address F1 READ ONLY
This register is read-only and monitors the state
of several disk interface pins, in PS/2 and Model
30 modes. The SRB can be accessed at any
time when in PS/2 mode. In the PC/AT mode
the data bus pins D0 - D7 are held in a high
impedance state for a read of address 3F1.
PS/2 Mode
BIT 0 MOTOR ENABLE 0
Active high status of the MTR0 disk interface
output pin. This bit is low after a hardware reset
and unaffected by a software reset.
BIT 1 MOTOR ENABLE 1
Active high status of the MTR1 disk interface
output pin. This bit is low after a hardware reset
and unaffected by a software reset.
BIT 2 WRITE GATE
Active high status of the WGATE disk interface
output.
BIT 3 READ DATA TOGGLE
Every inactive edge of the RDATA input causes
this bit to change state.
BIT 4 WRITE DATA TOGGLE
Every inactive edge of the WDATA input causes
this bit to change state.
BIT 5 DRIVE SELECT 0
Reflects the status of the Drive Select 0 bit of
the DOR (address 3F2 bit 0). This bit is cleared
after a hardware reset, it is unaffected by a
software reset.
BIT 6 RESERVED
Always read as a logic "1".
BIT 7 RESERVED
Always read as a logic "1".
7
6
5
4
3
2
1
0
1
DRIVE
SEL0
WDATA
TOGGLE
RDATA
TOGGLE
WGATE
MOT
EN1
MOT
EN0
RESET
COND.
1
0
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