beautypg.com

Mz3500, 5^. fdc (upd765) – Sharp MZ-3500 User Manual

Page 52

Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".

background image

5^. FDC (UPD765)

UPD765 pin configuration (top view)

MZ3500

UPD765 block diagram

KLSt I 0~---►

RDO——►

WHO——►

CSO—

AOO—

DBO

I NDEXO-------- ►

I NTCV«------

)fO-

GNDO-

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

—O Vcc

-►ORW/SEEK

-►O LCT/Dl R

-►O FLTR/STEP

->0 HOLD

—O READY

■O WPRT/2S1DE

FLT/TRKO

♦O

WDATA

-►O USO

-►O USl

-*0

SYNC

—O RDATA

*------ O WINDOW

—O WCLK

- kf AH'»

* 1 K T 2 ' ' 1 D F ­

- 1 S D F X

- n T T k K O

•^Efch

H ' X D

S { D F

L C T I ) J R

► F L T K S T E P

RESET ; Reset

MFM

RD : Read

SIDE

WR ; Write

USO, 1

CS ; Chip Select

WDATA

AO : AO

PSO, 1

DBO • 7 ; Data Bus

FLT

DRQ : DMA Request

TRKO

DACK : DMA Acknowledge

WPRT

TC : Terminal Count

2 SIDE

INDEX : Index

READY

INT : Interrupt Request

HDLD

0 : Clock

FLTR

GND : Ground

STEP

WCLK ; Write Clock

LCT

WINDOW : Data Window

DIR

RDATA : Read Data

RW/SEEK

SYNC : VFO Synchronize

WE : Write Enable

: MFM Mode

; Side Select

: Unit Select

: Write Data

: Pre Shift

; Fault

: Track 0

; Write Protected

: Two Side

; Ready

: Head Load

; Fault Reset

: Step

: Low Current

: Direction

: Read Write/Seek

- 57