FDC37N869 View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
FDC37N869
SMSC -> Microchip
'FDC37N869' PDF : 147 Pages View PDF
SYMBOL
LOCK
MFM
MT
N
NCN
ND
OW
PCN
POLL
PRETRK
R
RCN
SC
NAME
DESCRIPTION
Time
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).
MFM/FM Mode
Selector
A one selects the double density (MFM) mode. A zero selects single
density (FM) mode.
Multi-Track
Selector
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.
Sector Size Code
This specifies the number of bytes in a sector. If this parameter is “00”,
then the sector size is 128 bytes. The number of bytes transferred is
determined by the DTL parameter. Otherwise the sector size is (2
raised to the “N’th” power) times 128. All values up to “07” hex are
allowable. “07”h would equal a sector size of 16k. It is the user’s
responsibility to not select combinations that are not possible with the
drive.
N
SECTOR SIZE
00
128bytes
01
256bytes
02
512bytes
...
...
07
16Kbytes
New Cylinder
Number
The desired cylinder number.
Non-DMA Mode
Flag
When set to “1”, indicates that the FDC is to operate in the non-DMA
mode. In this mode, the host is interrupted for each data transfer.
When set to 0, the FDC operates in DMA mode, interfacing to a DMA
controller by means of the DRQ and nDACK signals.
Overwrite
The bits D0-D3 of the Perpendicular Mode Command can only be
modified if OW is set to “1”. OW id defined in the Lock command.
Present Cylinder The current position of the head at the completion of Sense Interrupt
Number
Status command.
Polling Disable When set, the internal polling routine is disabled. When clear, polling
is enabled.
Precompensatio
n Start Track
Number
Programmable from track 00 to FFH.
Sector Address
The sector number to be read or written. In multi-sector transfers, this
parameter specifies the sector number of the first sector to be read or
written.
Relative Cylinder Relative cylinder offset from present cylinder as used by the Relative
Number
Seek command.
Number of
The number of sectors per track to be initialized by the Format
Sectors Per Track command. The number of sectors per track to be verified during a
Verify command when EC is set.
SMSC DS – FDC37N869
Page 37
Rev. 11/09/2000
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