Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
SYMBOL
LOCK
NAME
DESCRIPTION
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
MT
MFM/FM Mode
Selector
A one selects the double density (MFM) mode. A zero selects single
density (FM) mode.
Multi-Track
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
Selector
automatically continue to the first sector under head 1 when the FDC
finishes operating on the last sector under head 0.
N
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
128 Bytes
256 Bytes
512 Bytes
1024 Bytes
…
00
01
02
03
…
07
16K Bytes
NCN
ND
New Cylinder
Number
The desired cylinder number.
Non-DMA Mode Write ‘0’. This part does not support non-DMA mode.
Flag
OW
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.
PCN
Present Cylinder The current position of the head at the completion of Sense Interrupt
Number
Status command.
POLL
PRETRK
Polling Disable
When set, the internal polling routine is disabled. When clear, polling
is enabled.
Precompensation Programmable from track 00 to FFH.
Start Track
Number
R
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.
RCN
SC
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.
SK
Skip Flag
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.
SMSC LPC47M182
57
Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)
DATASHEET
SMSC [ SMSC CORPORATION ]
