LPC47M192 datasheet(61/228 Pages) SMSC

61 / 228 page

SMSC DS – LPC47M192

Page 61

Rev. 03/30/05

DATASHEET

Configure

The Configure command is issued to select the special features of the FDC. A Configure command need not be

issued if the default values of the FDC meet the system requirements.

Table 26 – Drive Control Delays (ms)

HUT

SRT

500K

300K

250K

500K

300K

250K

128

112

120

256

224

240

426

26.7

373

400

512

448

480

3.75

0.5

0.25

7.5

0.5

26.7

3.33

1.67

HLT

500K

300K

250K

0.5

63.5

128

126

127

256

252

254

426

3.3

6.7

420

423

512

504

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.

LPC47M192 Datasheet(PDF) 61 Page - SMSC Corporation

LPC47M192 Datasheet(HTML) 61 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL