FDC37C672QFP SMSC Corporation, FDC37C672QFP Datasheet - Page 41

• Manufacturer Part Number: FDC37C672QFP
• Description: ENHANCED SUPER I/O CONTROLLER WITH FAST IR
• Manufacturer: SMSC Corporation

Enhanced Super I/O Controller with Fast IR
Datasheet
SMSC FDC37C672
MFM
MT
N
NCN
ND
OW
PCN
POLL
PRETRK
R
RCN
SC
SK
SRT
SYMBOL
MFM/FM Mode
Selector
Multi-Track Selector
Sector Size Code
New Cylinder
Number
Non-DMA Mode
Flag
Overwrite
Present Cylinder
Number
Polling Disable
Precompensation
Start Track Number
Sector Address
Relative Cylinder
Number
Number of Sectors
Per Track
Skip Flag
Step Rate Interval
NAME
PRELIMINARY DATASHEET
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.
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.
The desired cylinder number.
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.
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.
The current position of the head at the completion of Sense Interrupt Status
command.
When set, the internal polling routine is disabled. When clear, polling is
enabled.
Programmable from track 00 to FFH.
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 offset from present cylinder as used by the Relative Seek
command.
The number of sectors per track to be initialized by the Format command.
The number of sectors per track to be verified during a Verify command
when EC is set.
When set to 1, sectors containing a deleted data address mark will
automatically be skipped during the execution of Read Data. If Read Deleted
is executed, only sectors with a deleted address mark will be accessed.
When set to "0", the sector is read or written the same as the read and write
commands.
The time interval between step pulses issued by the FDC. Programmable
from 0.5 to 8 milliseconds in increments of 0.5 ms at the 1 Mbit data rate.
Refer to the SPECIFY command for actual delays.
Page 41
00
01
02
03
. .
N
DESCRIPTION
SECTOR SIZE
1024 bytes
128 bytes
256 bytes
512 bytes
. . .
Rev. 10-29-03