FDC37C669-MT SMSC, FDC37C669-MT Datasheet - Page 19

• Manufacturer Part Number: FDC37C669-MT
• Description: IC CTRLR SUPER I/O FLPPY 100TQFP
• Manufacturer: SMSC

Specifications of FDC37C669-MT

• Controller Type: I/O Controller
• Interface: ISA Host
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 25mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1008

STATUS REGISTER A (SRA)
Address 3F0 READ ONLY
This register is read-only and monitors the state of the
FINTR
PS/2 Mode
BIT 0 DIRECTION
Active high status indicating the direction of head
movement. A logic "1" indicating inward direction a logic
"0" outward.
BIT 1 nWRITE PROTECT
Active low status of the WRITE PROTECT disk interface
input. A logic "0" indicating that the disk is write protected.
BIT 2 nINDEX
Active low status of the INDEX disk interface input.
BIT 3 HEAD SELECT
Active high status of the HDSEL disk interface input. A
logic "1" selects side 1 and a logic "0" selects side 0.
RESET
COND.
pin
and
PENDING
several
INT
7
0
disk
nDRV2
N/A
6
interface
STEP
5
0
pins,
nTRK0 HDSEL nINDX
N/A
4
19
in PS/2 and Model 30 modes. The SRA 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 3F0.
BIT 4 nTRACK 0
Active low status of the TRK0 disk interface input.
BIT 5 STEP
Active high status of the STEP output disk interface
output pin.
BIT 6 nDRV2
Active low status of the DRV2 disk interface input pin,
indicating that a second drive has been installed.
BIT 7 INTERRUPT PENDING
Active high bit indicating the state of the Floppy Disk
Interrupt output.
3
0
N/A
2
nWP
N/A
1
DIR
0
0