FDC37C669-MT SMSC, FDC37C669-MT Datasheet - Page 41

• 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

COMMAND SET/DESCRIPTIONS
Commands can be written whenever the FDC is in the
command phase. Each command has a unique set of
needed parameters and status results. The FDC checks
to see that the first byte is a valid command and, if valid,
proceeds with the command. If it is invalid, an interrupt
C
D
D0, D1, D2,
D3
DIR
DS0, DS1
DTL
EC
EFIFO
EIS
EOT
GAP
SYMBOL
Cylinder Address
Data Pattern
Drive Select 0-3
Direction Control
Disk Drive Select
Special Sector
Size
Enable Count
Enable FIFO
Enable Implied
Seek
End of Track
NAME
Table 18 - 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.
DS1
which
0
0
1
1
41
is issued.
command which returns an invalid command error. Refer
to Table 18 or explanations of the various symbols used.
Table 19 lists the required parameters and the results
associated with each command that the FDC is capable
of performing.
drives
DS0
0
1
0
1
DESCRIPTION
are
The user sends a Sense Interrupt Status
drive 0
drive 1
drive 2
drive 3
A "1" indicates a perpendicular
perpendicular
DRIVE
drives
on
the