FDC37M607 datasheet(37/182 Pages) SMSC

37 / 182 page

Table 19 - Description of Command Symbols

SYMBOL

NAME

DESCRIPTION

EOT

End of Track

The final sector number of the current track.

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 tha 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

FDC37M607 Datasheet(PDF) 37 Page - SMSC Corporation

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