PC97338VLJ datasheet(92/221 Pages) NSC

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TABLE 43. FDC Command Set Summary

3.6.1

Abbreviations Used in FDC

Commands

BFR Buffer enable bit set in the MODE command.

Enabled open-collector output buffers.

BST

Burst mode disable control bit set in MODE

command. Disables burst mode for the FIFO,

if the FIFO is enabled.

DC3-0 Drive Configuration for drives 3-0. Used to

configure a logical drive to conventional or

perpendicular mode. Used in the PERPEN-

DICULAR MODE command.

DENSEL

Density Select control bits set in the MODE

command.

DIR

Direction control bit used in RELATIVE SEEK

command to indicate step in or out.

DMA DMA mode enable bit set in the SPECIFY

command.

DS1-0 Drive Select for bits 1,0 used in most com-

mands. Selects the logical drive.

Enable Count control bit set in the VERIFY

command. When this bit is 1, SC (Sectors to

read Count) command byte is required.

EIS

Enable Implied Seeks. Set in the CONFIG-

URE command.

EOT End of Track parameter set in read, write,

scan, and VERIFY commands.

ETR Extended Track Range set in the MODE com-

mand.

FIFO First-In First-Out buffer. Also a control bit set

in the CONFIGURE command to enable or

disable the FIFO.

FRD FIFO Read Disable control bit set in the

MODE command

FWR FIFO Write disable control bit set in the

MODE command.

Gap 2 The length of gap 2 in the FORMAT TRACK

command and the portion of it that is rewritten

in the WRITE DATA command depend on the

drive mode, i.e., perpendicular or convention-

al. Figure 58 on page 99 illustrates gap 2

graphically. For more details, see “Bits 1,0 -

Group Drive Mode Configuration (GDC)” on

page 105.

Gap 3 Gap 3 is the space between sectors, exclud-

ing the synchronization field. It is defined in

the FORMAT TRACK command. See Figure

58 on page 99.

Command

Opcode

432 10

CONFIGURE

1 0 0 1 1

DUMPREG

011 10

FORMAT TRACK

MFM

011 01

INVALID

Invalid Opcode

LOCK

101 00

MODE

000 01

NSC

110 00

PERPENDICULAR

MODE

100 10

READ DATA

MT MFM

001 10

READ DELETED

DATA

MT MFM

011 00

READ ID

MFM

010 10

READ TRACK

MFM

000 10

RECALIBRATE

001 11

RELATIVE SEEK

MFM

0 1 1 1 1

SCAN EQUAL

MT MFM

1 0 0 0 1

SCAN HIGH OR

EQUAL

MT MFM

111 01

SCAN LOW OR

EQUAL

MT MFM

110 01

SEEK

0 1 1 1 1

SENSE DRIVE

STATUS

001 00

SENSE

INTERRUPT

010 00

SET TRACK

000 01

SPECIFY

0 0 0 1 1

VERIFY

MT MFM

1 0 1 1 0

VERSION

1 0 0 0 0

WRITE DATA

MT MFM

001 01

WRITE DELETED

DATA

MT MFM

010 01

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