LPC47M192 datasheet(46/228 Pages) SMSC

46 / 228 page

SMSC DS – LPC47M192

Page 46

Rev. 03/30/05

DATASHEET

Table 16 – Description of Command Symbols

SYMBOL

NAME

DESCRIPTION

GAP

Alters Gap 2 length when using Perpendicular Mode.

GPL

Gap Length

The Gap 3 size. (Gap 3 is the space between sectors excluding the

VCO synchronization field).

H/HDS

Head Address

Selected head: 0 or 1 (disk side 0 or 1) as encoded in the sector ID

field.

HLT

Head Load Time

The time interval that FDC waits after loading the head and before

initializing a read or write operation. Refer to the Specify command

for actual delays.

HUT

Head Unload

Time

The time interval from the end of the execution phase (of a read or

write command) until the head is unloaded. Refer to the Specify

command for actual delays.

LOCK

Lock defines whether EFIFO, FIFOTHR, and PRETRK parameters of

the CONFIGURE COMMAND can be reset to their default values by

a “software Reset”. (A reset caused by writing to the appropriate bits

of either the DSR or DOR)

MFM

MFM/FM Mode

Selector

A one selects the double density (MFM) mode. A zero selects single

density (FM) mode.

Multi-Track

Selector

When set, this flag selects the multi-track operating mode. In this

mode, the FDC treats a complete cylinder under head 0 and 1 as a

single track. The FDC operates as this expanded track started at the

first sector under head 0 and ended at the last sector under head 1.

With this flag set, a multitrack read or write operation will

automatically continue to the first sector under head 1 when the FDC

finishes operating on the last sector under head 0.

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.

SECTOR SIZE

128 Bytes

256 Bytes

512 Bytes

1024 Bytes

…

16K Bytes

NCN

New Cylinder

Number

The desired cylinder number.

Non-DMA Mode

Flag

Write ‘0’. This part does not support non-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.

PCN

Present Cylinder

Number

The current position of the head at the completion of Sense Interrupt

Status command.

POLL

Polling Disable

When set, the internal polling routine is disabled. When clear, polling

is enabled.

PRETRK

Precompensation

Start Track

Number

Programmable from track 00 to FFH.

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.

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