5 3

NI5HA INTERfACE

GENERAL DESCRIPTION:

PI N SIGNAL NAME 110 FUNCTION

---~--- ---

INDEX 0 THIS SIGNAL INDICATES THE BEGINNING OF SERVO SECTOR AND END OF DATA SECTOR 31. ONE PER REVOLUTION (2749RPH + -1.5~).

3 SECTOR 0 THIS SIGNAL INDICATES THE BEGINNING OF DATA SECTORS.

TOTAL DATA SECTORS IS 32 STARTING FROM SECTOR OTO 31.

EACH SECTOR HAS 620+-16 BYTES OR 661 +-17 US.

5 RWCLK 0 READIWRITE CLOCK IS THE SIGNAL TO SVNCHRONIZE THE DRIVE READIWRITE DATA. CLOCK FREQUENCV IS 7.5 MHZ + -40~. WITH 50+ -10 "DUTY CYCLE.

7 /RDATA 0 NRZ READ DATA FROM DRIVE IS SYNCHRONIZED TO THE RISING EDGE OF THE READ/WRITE CLOCK (RWCLK). READ DATA CAN CHANGE AT A MIN. OF 40NS AND AT A MAX. OF 90NS FROM THE

RISING EDGE OF THE RWCLK.

9 WDATA NRZ WRITE DATA FROM CONTROLLER IS SYNCHRONIZED TO THE RISING EDGE OF THE RWCLK. WRITE DATA CAN CHANGE AT A MIN. Of 40NS AND AT A MAX. Of 90NS FROM THE RISING EDGE OF THE RYVCLK.

11 /WTGT WRITE GATE FROM CONTROLLERJ WHICH INDICATES THAT WRITE DATA IS SHifTING FROM CONTROLLER TO DRIVE.

12 HSO HEAD SELECT 0 I NDICATES THE SELECTION OF HEAD O. HEAD SWIT - CHING RECOVERY TIME IS 1 US.

13 RDGT READ GATE FROM CONTROLLER, WHICH MUST BE TURNED ON AT GLITCH FREE DATA SYNCHRONIZATION AREA. READ DATA WI LL BE AVAILABLE AFTER

veo

BYTES (DO).

veo

14 HS1 HEAD SELECT 1 ^J A RESERVED PIN FOR FUTURE ADDITON OF READ WRITE HEADS.

15 SERVOUT 0 SERVO SERIAL DATA OUT IS AN OUTPUT SIGNAL THAT SHifTS SERVO STATUS FROM DRIVE TO CONTROLLER AT A MAX. RATE OF 58.6 K

BlTSISEC.

16 /RWI REDUCED WRITE CURRENT IS A SIGNAL THAT INDICATES TO DRIVE THAT LESS WRITE CURRENT IS REQUIRED AT THE INSIDE TRACKS WHICH HAVE HUCH HIGHER FLUX CHANGE PER INCH (fCI).

17 SERVOIN SERVO SERIAL DATA IN IS AN INPUT SIGNAL THAT SHIFTS SERVO COMMANDS fROM CONTROLLER TO DRIVE AT A MAX. RATE OF

58.6 K BITS/SEC.

18 /SERVORST SERVO RESET IS AN INPUT SIGNAL THAT RESET THE SERVO CONTROL FUNCTIONS.

NISHA INTERFACE

19 SIORDV

o

21 SERVORDY

o

23/\ SERVOERR 0

II' .. t:{"'

r (

__ u., / ^{I _ C;CL-} £.

';

e

SERVO INPUT /OUTPUT READY IS AN INDICATION FROM DRIVE TO CONTROLLER THAT SERVO COMMUNICATION IS READY.

SERVO READY IS AN OUTPUT SIGNAL THAT DRIVE INDICATES TO CONTROLLER THAT READIWRITE HEAD IS ON TRACK AND IS READY fOR REAOfWRITE DATA TRANSFER.

SERVO ERROR IS AN OUTPUT SIGNAL THAT DRIVE INDICATES TO CONTROLLER THAT SERVO COMMUNICATION HAS AN ERROR OR SERVO TRACK FOLLOWING HAS AN ERROR.

POWER SUPPLY INPUT POWER SUPPL V INPUT GROUND

GROUND GROUND

POWER SUPPL V INPUT POWER SUPPLY INPUT

NEGATIVE POWER SUPPLY INPUT

POWER SUPPLY TO MOTOR (ISOLATED fROM + 12V IN NISHA) tilTOR GROUND- (ISOLATED FROM GND IN NISHA)

HI6HA IHTE~fACE

DC ELECTRICAL CHARACTERISTICS (TEMPERATURE-1 0 TO 60 C )

PARAMETER MIN TVP MAX UNIT COMMENTS

---

VIL I NPUT LOW VOLTAGE -0.3

O.B

vee

=

. VOL OUTPUT lOW VOLTAGE 0.4 V 3 LSTTl=+ 1.2 MA

VOH OUTPUT HIGH VOLTAGE 2.4 V 3lSTTl=-120UA

5V POWER SUPPl V VOLTAGE 4.75 5.00 5.25 V lit MAX + 12V POWER SUPPLY VOLTAGE 12.0 13.2 V

-12V NEG POWER SUPPLY VOLTAGE -12.0 -13.2 V MOTOR + 12V r1lTOR SUPPLY VOLTAGE 12.0 13.2 V

J"..

I

~ ~11'IJ111".,tHll\\~Q"A~F IV"" " ' N A , •

-- ____ NI5HA_

'NTLRTA( E. --__ ----_ - ________________________________ --__ -_______________________________ - ---- --- ---- ---. _.- AC

s

I ND£X _ - - - J

"'

IJJS

1

:t~o7°

\\\\

SECTo " 1 . - _ - ' - -_ _ _ --'

---27~~fM:t

'0 570 <£---..,"

=

I

661±l7AAS

S~~~

SE~

._~n

ll\\

-

________

____________________________

1 10

F

^6Zo!

6

---..t

1~:tS~ =

S7

I

~O~ I~

______________________________________________________

- ^51Lt

~~~/6~

- 26-1

^-

^{- --}

¹⁴

^{~I. 6-1}

PA7lf

fO~ s'Sil _[~- - - - - ~~I ~ lTI T~ HS TI n6 ~~ ~-- - - - - --00 ~/5S DATA ECC

I

~/al-+~. _/~"

Cf

-

IWF/7E J)IJTAI ^I

IlJ

if

-

6T

--

I I I I

MfAJ

i ,-Z+IZ-+.

^..

H~r

~T

I I I I

I \ r ¹

.' ,#1

T i

I I

I

FOk.~I I

I

'll'"

I

"(;1'( ^{~v • • _ _ ~, _} .. _ _ _ _ ~ ..

,

~ s I.

e ⁶

..:LL_5_~_~ ___ z, I ~

N~: TI - ,R.AeJ::.

BYf!._'

T¢

==

H S

=

=

--- --- --- - - - J - - - - -

~

I

~ 41 3131 100 5'iEETS 5 SOIJARE

~ 4} lAO 20" ~"'HTS ~ SQI'"QE

/V..nTIC-'/VAI • • •

_ _ _ _

________ _

RWCLI<.

---"I~-~---~---~----~---~---~---~---+---

¥ff~T

40/15

MIN

~l

- - - = = - - - l l l L ] ^XXI

IWtl7~A41A1

r-3~

RWCLf<.

_ I - - U - L I ^{, I}

WTGtT

, ~l>mAl.

VAUPr- W(q1E. ACrlV

~

^{7·5M1Hl. I}

'--LIl_~_1 I

1

L~

~6T t'o'_~

______________________________

______

____ --__________________________________ _

NaTE. ~: RWCLK P~/ot>= T 5MHZ =

NOTE ~: HJ:AD .sw'TCHIN~, REcoVERy TIME = I A./S _"

____ ~~3: ~~~D~~~Y ~M~ 8o~~~

__________________________________________