LPC47M112-MW Standard Microsystems (SMSC), LPC47M112-MW Datasheet - Page 58

• Manufacturer Part Number: LPC47M112-MW
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47M112-MW

• Lead Free Status / RoHS Status: Compliant

Enhanced Super I/O Controller with LPC Interface
Datasheet
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
RCN
SMSC DS – LPC47M112
Relative Cylinder Number that determines how many tracks to step the head in or out from the current track
number.
Head Step Direction Control
00
01
02
7F
7F
E
F
0
1
..
..
2M
64
56
60
4
..
63.5
2M
0.5
64
63
1
..
128
112
120
1M
8
..
500K
256
224
240
Table 26 - Drive Control Delays (ms)
16
..
HUT
128
126
127
DIR
1M
1
2
..
0
1
DATASHEET
300K
26.7
426
373
400
..
Step Head Out
Step Head In
250K
Page 58
512
448
480
32
..
ACTION
500K
256
252
254
2
4
..
3.75
0.25
2M
0.5
4
..
HLT
1M
7.5
0.5
8
..
1
300K
426
420
423
3.3
6.7
..
500K
16
15
..
2
1
SRT
300K
26.7
3.33
1.67
25
..
250K
512
504
508
4
8
.
250K
32
30
4
2
..
Rev. 02-16-07