FDC37N769_07 SMSC [SMSC Corporation], FDC37N769_07 Datasheet - Page 51

• Manufacturer Part Number: FDC37N769_07
• Description: 3.3V Super I/O Controller with Infrared Support for Portable Applications
• Manufacturer: SMSC [SMSC Corporation]

Control Commands
Control commands differ from the other commands in that no data transfer takes place. Three commands generate
an interrupt when complete: Read ID, Recalibrate, and Seek. The other control commands do not generate an
interrupt.
Read ID
The Read ID command is used to find the present position of the recording heads. The FDC stores the values from
the first ID field it is able to read into its registers. If the FDC does not find an ID address mark on the diskette after
the second occurrence of a pulse on the nINDEX pin, it then sets the IC code in Status Register 0 to “01”
(abnormal termination), sets the MA bit in Status Register 1 to “1”, and terminates the command.
The following commands will generate an interrupt upon completion. They do not return any result bytes. It is highly
recommended that control commands be followed by the Sense Interrupt Status command. Otherwise, valuable
interrupt status information will be lost.
SMSC DS – FDC37N769
GPL1 = suggested GPL values in Read and Write commands to avoid splice point
between data field and ID field of contiguous sections.
GPL2 = suggested GPL value in Format A Track command.
*PC/AT values (typical)
**PS/2 values (typical). Applies with 1.0 MB and 2.0 MB drives.
NOTE: All values except sector size are in hex.
Drives
Drives
5.25”
3.5”
FORMAT
MFM
MFM
FM
FM
Table 44 - Typical Values for Formatting
SECTOR SIZE
DATASHEET
512**
1024
2048
4096
1024
2048
4096
1024
512*
128
128
512
256
256
128
256
512
256
...
...
Page 51 of 137
00
00
02
03
04
05
01
01
02
03
04
05
...
...
N
0
1
2
1
2
3
SC
0F
0F
12
10
08
04
02
01
12
10
09
04
02
01
09
05
09
05
GPL1
C8
C8
0A
2A
C8
C8
0F
1B
0E
1B
07
10
18
46
20
80
07
35
GPL2
0C
FF
FF
F0
FF
FF
1B
2A
3A
09
19
30
87
32
50
36
54
74
Rev. 02-16-07