PC87338 datasheet(93/221 Pages) NSC

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GDC Group Drive Configuration for all drives. Con-

figures all logical drives as conventional or

perpendicular. Used in the PERPENDICULAR

MODE command. Formerly, GAP2 and WG.

Head Select control bit used in most com-

mands. Selects Head 0 or 1 of the disk.

IAF

Index Address Field control bit set in the

MODE command. Enables the ISO Format

during the FORMAT command.

IPS

Implied Seek enable bit set in the MODE,

read, write, and scan commands.

LOCK Lock enable bit in the LOCK command. Used

to prevent certain parameters from being af-

fected by a software reset.

LOW PWR

Low Power control bits set in the MODE com-

mand.

MFM Modified Frequency Modulation parameter

used in FORMAT TRACK, read, VERIFY and

write commands.

MFT Motor Off Time. Now called Delay After Pro-

cessing time. This delay is set by the SPECI-

FY command.

MNT Motor On Time. Now called Delay Before Pro-

cessing time. This delay is set by the SPECI-

FY command.

MSB Most Significant Byte controls which whether

the most or least significant byte is read or

written in the SET TRACK command.

Multi-Track enable bit used in read, write,

scan and VERIFY commands.

Overwrite control bit set in the PERPENDICU-

LAR MODE command.

POLL Enable Drive Polling bit set in the CONFIG-

URE command.

PRETRK

Precompensation Track Number set in the

CONFIGURE command

PTR Present Track number. Contains the internal

8-bit track number or the least significant byte

of the 12-bit track number of one of the four

logical disk drives. PTR is set in the SET

TRACK command.

R255 Recalibration control bit set in MODE com-

mand. Sets maximum number of STEP pulses

during RECALIBRATE command to 255.

RTN Relative Track Number used in the RELATIVE

SEEK command.

Sector Count control bit used in the VERIFY

command.

Skip control bit set in read and scan and VER-

IFY operations.

SRT

Step Rate Time set in the SPECIFY com-

mand. Determines the time between STEP

pulses for SEEK and RECALIBRATE opera-

tions.

ST0-3

Result phase Status registers 3-0 that contain

status information about the execution of a

command. See Sections 3.5.1 through 3.5.4.

THRESH

FIFO threshold parameter set in the CONFIG-

URE command

TMR Timer control bit set in the MODE command.

Affects the timers set in the SPECIFY com-

mand.

Formerly, the Write Gate control bit. Now in-

cluded in the Group Drive mode Configuration

(GDC) bits in the PERPENDICULAR MODE

command.

WLD Wildcard bit in the MODE command used to

enable or disable the wildcard byte (FF) dur-

ing scan commands.

WNR Write Number controls whether to read an ex-

isting track number or to write a new one in

the SET TRACK command.

PC87338 Datenblatt(PDF) 93 Page - National Semiconductor (TI)

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