TMS279X datasheet(34/40 Pages) TI

34 / 40 page

TMS279X (WD279X) FLOPPY DISK FORMATTER / CONTROLLER FAMILY

WRITE ENABLE TIMING

PARAMETER

TEST

CONDITIONS

ALT.

SYMBOL†

MIN

TYP

MAX

UNIT

tsu(A-WE)

A0, A1 to WE# setup time

TSET

tsu(CS-WE)

CS# to VVE# setup time

TSET

th(A-WE)

A0, A1 from WE# hold time

THLD

th(CS-WE)

CS# from WE# hold time

THLD

tw(WE)

WE# pulse duration

TWE

200

trs(WE-DRQ) DRQ reset time from WE#

TDRR

100

200

trs(WE-INT)

INTRQ reset time from WE#

TIRR

500

3000

tsu(D-WE)

Data setup time to WE#

TDS

150

th(D-WE)

Data hold time from WE#

TDH

† Symbol used in Western Digital Corporation WD279X-02 Data Sheet.

* Time doubles when CLK = 1 MHz.

† t

SERVICE (WORST CASE): FM 27.5µs, MFM 13.5 µs.

NOTES:

CS# may be permanently tied low if desired.

DRQ rising edge: indicates that the data register has assembled data

DRQ falling edge: indicates that the data register was read.

INTREQ rising edge: occurs at end of command.

INTREQ falling edge: indicates that the status register was read.

TMS279X Datasheet(PDF) 34 Page - Texas Instruments

TMS279X Datasheet(HTML) 34 Page - Texas Instruments

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