FDC37C669-MS Standard Microsystems (SMSC), FDC37C669-MS Datasheet - Page 21

• Manufacturer Part Number: FDC37C669-MS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37C669-MS

• Pin Count: 100
• Lead Free Status / RoHS Status: Compliant

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
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.
RESET
COND.
7
1
1
6
1
1
DRIVE
SEL0
5
0
TOGGLE
WDATA
4
0
TOGGLE
21
RDATA
3
0
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.
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".
WGATE
2
0
MOT
EN1
1
0
MOT
EN0
0
0