FDC37N769_07 SMSC [SMSC Corporation], FDC37N769_07 Datasheet - Page 34

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

SMSC DS – FDC37N769
D0, D1, D2,
DS0, DS1
SYMBOL
H/HDS
EFIFO
LOCK
MFM
EOT
GAP
GPL
HUT
DTL
HLT
DIR
EIS
EC
MT
D3
C
D
Enable FIFO
Enable Implied
End of Track
Gap Length
Head Address
Cylinder Address
Data Pattern
Drive Select 0-3
Direction Control
Disk Drive Select
Special Sector
Size
Enable Count
Seek
Head Load Time
Head Unload
Time
MFM/FM Mode
Selector
Multi-Track
Selector
NAME
Table 35 - Description of Command Symbols
The currently selected address; 0 to 255.
The pattern to be written in each sector data field during formatting.
Designates
Perpendicular Mode Command.
drive.
If this bit is “0”, then the head will step out from the spindle during a
relative seek. If set to a “1”, the head will step in toward the spindle.
By setting N to zero (00), DTL may be used to control the number of
bytes transferred in disk read/write commands. The sector size (N =
0) is set to 128. If the actual sector (on the diskette) is larger than
DTL, the remainder of the actual sector is read but is not passed to
the host during read commands; during write commands, the
remainder of the actual sector is written with all zero bytes. The CRC
check code is calculated with the actual sector. When N is not zero,
DTL has no meaning and should be set to FF HEX.
When this bit is “1” the “DTL” parameter of the Verify command
becomes SC (number of sectors per track).
This active low bit when a 0, enables the FIFO. A “1” disables the
FIFO (default).
When set, a seek operation will be performed before executing any
read or write command that requires the C parameter in the
command phase. A “0” disables the implied seek.
The final sector number of the current track.
Alters Gap 2 length when using Perpendicular Mode.
The Gap 3 size. (Gap 3 is the space between sectors excluding the
VCO synchronization field).
Selected head: 0 or 1 (disk side 0 or 1) as encoded in the sector ID
field.
The time interval that FDC waits after loading the head and before
initializing a read or write operation. Refer to the Specify command
for actual delays.
The time interval from the end of the execution phase (of a read or
write command) until the head is unloaded. Refer to the Specify
command for actual delays.
Lock defines whether EFIFO, FIFOTHR, and PRETRK parameters
of the CONFIGURE COMMAND can be reset to their default values
by a “software Reset” (A reset caused by writing to the appropriate
bits of either the DSR or DOR).
A one selects the double density (MFM) mode. A zero selects single
density (FM) mode.
When set, this flag selects the multi-track operating mode. In this
mode, the FDC treats a complete cylinder under head 0 and 1 as a
single track. The FDC operates as this expanded track started at the
first sector under head 0 and ended at the last sector under head 1.
With this flag set, a multitrack read or write operation will
automatically continue to the first sector under head 1 when the FDC
finishes operating on the last sector under head 0.
DATASHEET
DS1
0
0
1
1
Page 34 of 137
which
DS0
0
1
0
1
drives
DESCRIPTION
Drive 0
Drive 1
Drive 2
Drive 3
DRIVE
are
A “1” indicates a perpendicular
perpendicular
drives
on
Rev. 02-16-07
the