LPC47N227-MN View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'LPC47N227-MN' PDF : 202 Pages View PDF
SYMBOL
N
NCN
ND
OW
PCN
POLL
PRETRK
R
RCN
SC
SK
SRT
NAME
DESCRIPTION
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
128 Bytes
01
256 Bytes
02
512 Bytes
03
1024 Bytes
…
…
07
16K Bytes
New Cylinder
The desired cylinder number.
Number
Non-DMA Mode When set to 1, indicates that the FDC is to operate in the non-DMA
Flag
mode. In this mode, the host is interrupted for each data transfer.
When set to 0, the FDC operates in DMA mode.
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.
Precompensation Programmable from track 00 to FFH.
Start Track
Number
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 Sectors The number of sectors per track to be initialized by the Format
Per Track
command. The number of sectors per track to be verified during a
Verify command when EC is set.
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.
Step Rate Interval 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.
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