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FDC37C78-HT Datasheet(PDF) 29 Page - Microchip Technology

Part # FDC37C78-HT
Description  Floppy Disk Controller
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

FDC37C78-HT Datasheet(HTML) 29 Page - Microchip Technology

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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
is issued.
The user sends a Sense Interrupt
Status
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.
Table 18 - Description of Command Symbols
SYMBOL
NAME
DESCRIPTION
C
Cylinder Address
The currently selected address; 0 to 255.
D
Data Pattern
The pattern to be written in each sector data field during formatting.
D0, D1, D2,
D3
Drive Select 0-3
Designates
which
drives
are
perpendicular
drives
on
the
Perpendicular Mode Command.
A "1" indicates a perpendicular
drive.
DIR
Direction Control
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.
DS0, DS1
Disk Drive Select
DS1
DS0
DRIVE
0
0
drive 0
0
1
drive 1
1
0
drive 2
1
1
drive 3
DTL
Special Sector
Size
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.
EC
Enable Count
When this bit is "1" the "DTL" parameter of the Verify command
becomes SC (number of sectors per track).
EFIFO
Enable FIFO
This active low bit when a 0, enables the FIFO. A "1" disables the
FIFO (default).
EIS
Enable Implied
Seek
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.
EOT
End of Track
The final sector number of the current track.
GAP
Alters Gap 2 length when using Perpendicular Mode.
GPL
Gap Length
The Gap 3 size. (Gap 3 is the space between sectors excluding the
VCO synchronization field).
H/HDS
Head Address
Selected head: 0 or 1 (disk side 0 or 1) as encoded in the sector ID


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