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DPLL SCB68459

The SCB68459 Disk Phase Locked Loop (DPLL) Is a bipolar chip

that used together with the I jIIlDC 68454 prov I des a I I the

functions to control dlsk/dkt devices with SA800,ST506,ST1000

types Interfaces.

The DPLL uses an externa I VCO for the var I ab Ie clock rate

whIch tracks the read data from the disk unIt.

Dlsk/dkt controller uses two DPLL chIps because two dIfferent

frequences are needed. In fact dIsk devIce runs at 5Mblt per

second whl Ie dkt devIce runs at 250/500Kblt per second.

The SCB68459 operates producIng an oscl I lator frequency to

match. the frequency of an Input sIgnal.

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frequency and the VCO frequency.Thls phase shIft then acts as

an error sIgnal to change the frequency of the local DPLL

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The DPLL SCB68459 Is able to accept NRZ data and write clock

Information In paral lei from SNC68454.lt combines data and

clock to obtain a resul.tlng signal that becomes the write

data signal which goes to the disk drive.'

The DPll also bul It write precompensatlon algorithm In order

to adjust special clock data patterns that require

.

compensatlon.An external delay line Is used to generate the

precision compensation needed.

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Signetics

Microprocessor Products

DESCRIPTION

The SCN68454 Intelligent Multiple Disk

Controller (lMOC) provides the

tradition-al and advanced features required to

control Winchester type rigid disks and

floppy disks. It can control up to four .

rigid or floppy disk drives, in any

combi-nation. It can be used to control, with a

minimum of external hardware, any drive

that has an SA 1000 interface standard

or an ST506 Seagate interface standard.

The IMOC supports soft or hard

sec-tored disk track format and standard

IBM track formats for floppy disks (both

single and double density).

I

The controller is programmable via an

external host processor by the use of

high level commands. Data transfer on

C'

e host data bus can be 8 or 16-bit in

"'arallel. The IMOC is capable of

.han-dling a serial data rate of up to 10Mbits

per second. The SCN68454 is

construct-ed using Signetics MOSNLSI

tech-nology.

FEATURES

• Bus compatible with SCN68000

microprocessor

·c

• Automatic rerun on bus error

• Supports' SCN68000 vectored

Interrupts

• 31·blt address' counter

• 16/8·blt data transfers

• Supports up to 4 rigid' disks and

, floppy disks In' any combination

• Supports SA1000 and ST506

Winchester Interfaces

• l?ata rates up to 10Mblts per

second for MFM

• Data rates up to 2Mblts per

second for FM

• Handles FM and MFM data

encodlngl decoding

"'i

" : I '

'.

SCN68454

Intelligent Multiple Disl<

Controller (IMDe)

Preliminary. Specification

PIN CONFIGURATION

LOSH ASH OTACKN 015 014 013 LOCAL 012 011 . LAS DIP 010 EN1 09 ENO 08 BRN 07 IRQN 06 .. TICKLER SCLK WRGATE SECTORI . _INDEX

REOAT RESN VSS WClOCKI

RClOCK

WROAT 05

D4

03

TOP VIEW, .. I

COOO400S I ' I '

• On chip DMA controller and FIFO'

buffer (128 bytes)

• Multiple sector read/write with

Implied seek

• Automatic bad sector handling

• 32 and 40-blt ECC programmable

polynomials

.

• Supports computer generated

ECC polynomials

"

.

'

'. \ " !: .

.j i

INDEX

CORNER

7 47

8 0 46

PLCC

20 34 21 33

TOP VIEW CtJIlM'PS

Pin Function Pin Function

1 NC 27 NC 2 A2 28 D2 3Al 29 D3

4 BGACKN 30 D4 5 OWNN 31 D5 8 RERUNN 32 Vss 7 CSN 33 RESN 8 IACKN 34 SECTORIINDEX 9 BGN 35 SClK 10 DDIR 36 D6 11 LOCAL 37 07 12 UAS 38 08 13 LAS 39 D9 14 NC 40 NC 15 ENl 41 010 16 ENO 42 Dl1 17 BRN 43 D12 18 IRON 44 D13 19 TICKLER 45 014 20 WRGATE 46 D15 21 REDAT 47 DTACKN 22 WCLOCK/RClOCK 48 ASN 23 WROAT 49 lOSN 24 WRCLK 'c.··· 60 UOSN.