LPC47M112 View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
LPC47M112
SMSC -> Microchip
'LPC47M112' PDF : 204 Pages View PDF
Enhanced Super I/O Controller with LPC Interface
Datasheet
Table 26 - Drive Control Delays (ms)
HUT
SRT
2M 1M 500K 300K 250K 2M 1M 500K 300K 250K
0 64 128 256 426 512 4
8
16 26.7 32
14
8
16 26.7 32 3.75 7.5 15 25 30
.. ..
..
..
..
..
..
..
..
..
..
E 56 112 224 373 448 0.5
1
2 3.33 4
F 60 120 240 400 480 0.25 0.5
1 1.67 2
2M
00
64
01
0.5
02
1
..
..
7F
63
7F
63.5
HLT
1M
500K
300K
250K
128
256
426
512
1
2
3.3
4
2
4
6.7
8
..
..
..
.
126
252
420
504
127
254
423
508
Configure Default Values:
EIS - No Implied Seeks
EFIFO - FIFO Disabled
POLL - Polling Enabled
FIFOTHR - FIFO Threshold Set to 1 Byte
PRETRK - Pre-Compensation Set to Track 0
EIS - Enable Implied Seek. When set to "1", the FDC will perform a Seek operation before executing a read or write
command. Defaults to no implied seek.
EFIFO - A "1" disables the FIFO (default). This means data transfers are asked for on a byte-by-byte basis. Defaults to
"1", FIFO disabled. The threshold defaults to "1".
POLL - Disable polling of the drives. Defaults to "0", polling enabled. When enabled, a single interrupt is generated
after a reset. No polling is performed while the drive head is loaded and the head unload delay has not expired.
FIFOTHR - The FIFO threshold in the execution phase of read or write commands. This is programmable from 1 to 16
bytes. Defaults to one byte. A "00" selects one byte; "0F" selects 16 bytes.
PRETRK - Pre-Compensation Start Track Number. Programmable from track 0 to 255. Defaults to track 0. A "00"
selects track 0; "FF" selects track 255.
Version
The Version command checks to see if the controller is an enhanced type or the older type (765A). A value of 90 H is
returned as the result byte.
Relative Seek
The command is coded the same as for Seek, except for the MSB of the first byte and the DIR bit.
DIR Head Step Direction Control
RCN Relative Cylinder Number that determines how many tracks to step the head in or out from the current track
number.
DIR
ACTION
0 Step Head Out
1 Step Head In
SMSC DS – LPC47M112
Page 58
DATASHEET
Rev. 02-16-07
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