LPC47M182 datasheet(73/223 Pages) SMSC

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Advanced I/O Controller with Motherboard GLUE Logic

Datasheet

SMSC LPC47M182

Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)

DATASHEET

6.20

Sense Drive Status

Sense Drive Status obtains drive status information. It has not execution phase and goes directly to the

result phase from the command phase. Status Register 3 contains the drive status information.

6.21

Specify

The Specify command sets the initial values for each of the three internal times. The HUT (Head Unload

Time) defines the time from the end of the execution phase of one of the read/write commands to the head

unload state. The SRT (Step Rate Time) defines the time interval between adjacent step pulses. Note that

the spacing between the first and second step pulses may be shorter than the remaining step pulses. The

HLT (Head Load Time) defines the time between when the Head Load signal goes high and the read/write

operation starts. The values change with the data rate speed selection and are documented in Table 6.26.

The values are the same for MFM and FM.

DMA operation is selected by the ND bit. When ND is “0”, the DMA mode is selected. This part does not

support non-DMA mode. In DMA mode, data transfers are signaled by the DMA request cycles.

6.22

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 6.26 - 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

6.22.1 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.

LPC47M182 Datasheet(PDF) 73 Page - SMSC Corporation

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