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4. FDC DESCRIPTION (82078)

The 82078 is a true single-chip floppy disk controller for IBM PC/AT and PS/2
architectures. The integrated analog data separator needs no external compensation,
yet allows for a wide motor speed variation with exceptionally low soft error rates. The
microprocessor interface has 100% hardware register compatibility for PC/ATs and
PS/2s. The 16-byte FIFO with programmable thresholds is extremely useful in multiple
master systems or systems with a large amount of bus latency.

The following "82078 Block Diagram" below shows a block diagram of the 82078 floppy
disk controller.

PRECOMP

SERIAL

INTERFACE

LOGIC

WRITE CLK

GENERATOR

FLOPPY

DISK

DRIVE

INTERFACE

LOGIC

HOST

INTER-

FACE

LOGIC

INTERNAL OSC.

DATA RATE

SELECTION

POWER

MANAGEMENT

LOGIC

INPUT

OUTPUT

WRDATA

WE

MEDID0:1

PD

X [1:2]

IDENT0

IDLE

INTERNAL B

U

S

SRA
SRB

DOR

TDR

MSR
DSR

FIFO

DIR

CCR

DATA

SEPARATOR

MICRO-

CONTROLLER

DRVID0:1
DSKCHG
DRV2
WP
TRK0
INDX

DIR
STEP
HDSEL
DENSEL

DS [0:3]
ME [0:3]

IDENT1

VCCF

SEL3V#

RD#

WR#

A[0:2]

DACK#

DRQ

INT

TC

CS#

RESET

DB[0:7]

82078 Block Diagram

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

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Содержание ZT 8954

Страница 1: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

Страница 2: ...ZT 8954 Low Profile Floppy Disk Controller Hardware User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 3: ...RATION 13 FREQUENTLY ASKED QUESTIONS 13 WHY IS THE ZT 8954 IS INCOMPATIBLE WITH OLDER CPU BOARDS 13 WHAT FLOPPY DISK DRIVES ARE SUPPORTED BY THE ZT 8954 13 HOW DO I USE FRONTPLANE DMA 13 HOW DO I REMO...

Страница 4: ...RATURE 33 OPERATING TEMPERATURE 33 DC OPERATING CHARACTERISTICS 33 SUPPLY CURRENT VCC 34 NON CONDENSING RELATIVE HUMIDITY 34 STD BUS LOADING CHARACTERISTICS 34 MECHANICAL 37 CARD DIMENSIONS AND WEIGHT...

Страница 5: ...tions Chapter 3 Theory of Operation presents an operational view of the ZT 8954 s hardware Each of the board s functions is described in detail and some common concerns are addressed Chapter 4 FDC Des...

Страница 6: ...ded and with a mounting bracket to extend the drive out for use in card cages with front bezels for example the ZT 250 Mechanically the ZT 8954 is compatible with both the STD and the STD 32 bus speci...

Страница 7: ...ted Floppy Disk Drive 5 25 3 5 or 3 5 Slimline Bus Interface Interrupts External Floppy Interface Functional Block Diagram STD 32 Bus Interface STD bus interface logic decodes the I O address for cycl...

Страница 8: ...ytes 300 Kbytes 500 Kbytes and 1 Mbytes per second are supported through program control Perpendicular recording mode is supported for 2 88 Mbyte floppy disk drives An on board 16 byte FIFO provides i...

Страница 9: ...ier and Ziatech for an insurance settlement Retain the original shipping carton and packing material for inspection by the carrier Save the anti static bag for storing or returning the ZT 8954 Do not...

Страница 10: ...to the left of the ZT 8954 should be chosen with care so that they do not exceed the maximum height limit Should this happen select another board to install next to the ZT 8954 Note that the top of t...

Страница 11: ...al when compared to the 3 drives Jumpers W6 and W7 let you select the sense of this signal By default W7 is in this selects the proper logic level for DENSEL for 3 drives Refer to the description of W...

Страница 12: ...3 drives Refer to Appendix A Jumper Configurations for details FRONTPLANE CONNECTORS As shown in the Connector Locations drawing the ZT 8954 includes six frontplane connectors to interface to applica...

Страница 13: ...for a power cable connection location for remote floppy disk drives STD 32 COMPLIANCE STD 32 peripherals are required to meet certain compliance standards This allows the system integrator to match c...

Страница 14: ...nterface compatible such as the Colorado Memory Systems JUMBO tape drives How Do I Use Frontplane DMA The ZT 8954 is capable of frontplane DMA but only as a special option from Ziatech ZT 8954 D3 The...

Страница 15: ...lt for data transfers Data Transfers The floppy disk controller supports both polled and DMA driven data transfers Standard MS DOS uses DMA by default for moving data back and forth between the host C...

Страница 16: ...or all of the FDC registers These registers are further described in Chapter 4 FDC Description 82078 Floppy Disk Controller I O Registers I O Port Address I O Read Function I O Write Function 3F0h Sta...

Страница 17: ...ultiprocessing operations the floppy disk interface is shared between CPUs in the backplane Because different CPU boards are supported by different floppy disk interfaces the STD 32 STAR SYSTEM allows...

Страница 18: ...a large amount of bus latency The following 82078 Block Diagram below shows a block diagram of the 82078 floppy disk controller PRECOMP SERIAL INTERFACE LOGIC WRITE CLK GENERATOR FLOPPY DISK DRIVE IN...

Страница 19: ...uires the 1 Mbps data rate of the 82078 At this data rate the FIFO eases the host interface bottleneck due to the speed of data transfer to or from the disk if utilized STATUS DATA AND CONTROL REGISTE...

Страница 20: ...3F1h Default This register is read only and monitors the state of several disk interface pins This register is part of the PS 2 register set 7 6 5 4 3 2 1 0 DRIVE SEL0 1 MOT WE WRDATA TOGGLE RDDATA TO...

Страница 21: ...VERT low these signals are active low on the interface Standard programming practice is to set both MOT ENx and DRIVE SELx bits at the same time The Drive Activation Values table lists a set of DOR va...

Страница 22: ...and 1 the TAPESEL0 and TAPESEL1 bits allow you to select which drive is to be configured for tape drive support as shown in the Tape Drive Register Selection table The Tape Select bits are hardware R...

Страница 23: ...violate the timing 7 6 5 4 3 2 1 0 DRATE SEL1 S W RESET PRE COMP POWER DOWN PDOSC DRATE SEL0 2 PRE COMP 1 PRE COMP 0 Datarate Select Register Bit 7 S W RESET behaves the same as DOR RESET except that...

Страница 24: ...derstood and the 82078 compensates the data pattern as it is written to the disk The amount of precompensation is dependent upon the drive and media but in most cases the default value is acceptable T...

Страница 25: ...125 ns 300 Kbps 125 ns 200 Kbps 125 ns Main Status Register MSR 3F4h Default The Main Status Register is a read only register used to control command input and result output for all commands 7 6 5 4 3...

Страница 26: ...es Data transfers are governed by the RQM and DIO bits in the Main Status Register The FIFO defaults to PC AT compatible mode after any form of reset This maintains PC AT hardware compatibility The de...

Страница 27: ...1 x 16 s 1 5 s 14 5 s 2 bytes 2 x 16 s 1 5 s 30 5 s 8 bytes 8 x 16 s 1 5 s 126 5 s 15 bytes 15 x 16 s 1 5 s 238 5 s Digital Input Register DIR 3F7h Default This register senses the state of the DSKCHG...

Страница 28: ...2078 out of the power down state On entering the reset state all operations are terminated and the 82078 enters an idle state Activating reset while a disk write activity is in progress will corrupt t...

Страница 29: ...e set of needed parameters and status results The 82078 checks to see if the first byte is a valid command and if valid proceeds with the command Refer to the 82078 data sheet for details on the COMMA...

Страница 30: ...jumpers JUMPER OPTIONS ZT 8954 jumper locations are illustrated in the Customer Jumper Locations figure use this figure to document your jumper configuration if it differs from the factory default se...

Страница 31: ...loppy Interface Interrupt Selection DMA Mode Selection Factory Default Jumper Configuration ZT 8954 FLOPPY DISK INTERFACE BOARD J1 J4 J3 J2 W1 W2 W3 W4 W5 W6 W7 W8 W9 W10 W11 W12 W13 W14 W15 W16 W17 W...

Страница 32: ...ecific DMA Mode 1 frontplane DMA Mode 3 or a combination of frontplane and backplane signals for use in STD 80 backplanes Mode 0 The control signals are DMAIOR DMAIOW and T C for the backplane and DMA...

Страница 33: ...erted W8 Invert DRVDEN1 to floppy drive when in W9 Drive DRVDEN1 to floppy drive directly non inverted W10 Drive Write protect circuitry with WE from FDC W11 Factory Test option Do not install with W1...

Страница 34: ...0 01 slimline drive Absolute Maximum Ratings Supply Voltage Vcc 0 to 7 V Supply Voltage AUX V 0 to 13 V Storage Temperature ZT 8954 D0 40 to 85 C ZT 8954 D1 Integrated Floppy 20 to 60 C Operating Temp...

Страница 35: ...rds In the STD bus systems one unit load is equal to one LSTTL load as follows Maximum high level input current 20 Amps Maximum low level input current 400 Amps The STD bus unit load reflects input cu...

Страница 36: ...S A GROUND VBATT NC D3 A19 D2 A18 D1 A17 D0 A16 A7 A6 A5 A4 A3 A2 A1 A0 WR IORQ IOEXP INTRQ1 STATUS 1 BUSAK INTAK NC WAITRQ SYSRESET CLOCK PCO B AUX GND AUX V 2 4 6 1 3 5 1 1 1 1 59 59 59 59 8 10 12 1...

Страница 37: ...E28 E30 E32 E25 E27 E29 E31 E34 E36 E38 E40 E33 E35 E37 E39 E42 E44 E46 E48 E41 E43 E45 E47 E49 E51 E53 E55 PIN CIRCUIT SIDE OUTPUT DRIVE INPUT LOAD MNEMONIC PIN COMPONENT SIDE OUTPUT DRIVE INPUT LOA...

Страница 38: ...grated Floppy Disk Controller the ZT 8954 also requires just one slot The figure Board Dimensions shows the mechanical dimensions of the ZT 8954 The ZT 8954 D3 requires three STD card slots Board Leng...

Страница 39: ...illustration the ZT 8954 includes six connectors to interface to the STD bus and application specific devices The following topics provide descriptions of the individual connectors Connector assignmen...

Страница 40: ...interface the ZT 8954 to the STD 32 bus This connector combines with the P connector to make a 114 pin dual 57 pin card edge connector with fingers on 0 0625 inch contact spacing The mating connector...

Страница 41: ...E34 P21 P22 E35 E36 P23 P24 E37 E38 P25 P26 E39 E40 P27 P28 E41 E42 P29 P30 E43 E44 P31 P32 E45 E46 P33 P34 E47 E48 P35 P36 E49 E50 P37 P38 E51 E52 P39 P40 E53 E54 P41 P42 E55 E56 P43 P44 E57 E58 P45...

Страница 42: ...g J1 DMA Port Pinout table The floppy disk controller can use this connector to request service from the DMA controller on the ZT 8954 The mating connector is a T B Ansley 622 1030 This connector is n...

Страница 43: ...interfacing to drives with minimal cable twisting J2 or J3 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 33 31 29 27 25 23 19 21 17 15 13 11 9 7 5 3 1 DRVDEN 0 NC DRVDEN 1 INDEX ME1 DS0 DS1 ME0 DIREC...

Страница 44: ...to 0 5 meters in length J4 or J6 2 4 6 8 10 12 14 16 18 20 22 24 26 25 23 19 21 17 15 13 11 9 7 5 3 1 5V INDEX DISK CHANGE DS0 GND ME0 DIRECTION STEP WDATA WRITE PROTECT TRACK 0 MEDID0 MEDID1 5V 5V NC...

Страница 45: ...l floppy 20 inch cable for connecting non integrated 3 and 5 floppy drives to the ZT 8954 controller ZT 90172 20 power cable 2 5 1 VIOLET PIN 1 BLACK BLACK RED CONNECTOR IS AMP 170204 2 x4 HOUSING IS...

Страница 46: ...FEMALE 34 PIN CARD EDGE CONNECTOR 20 0 25 PIN 1 DRIVE B DRIVE A 2 0 0 25 2 0 0 25 2 0 0 25 ZT 90077 Floppy 20 Inch Cable 20 0 25 YELLOW PIN 1 GREY BLACK RED CONNECTOR IS AMP 170204 2 x4 HOUSING IS AM...

Страница 47: ...ra care in the design of the ZT 8954 in order to ensure reliability The product was designed in top down fashion using the latest in hardware and software design techniques so that unwanted side effec...

Страница 48: ...duct 4 Mark the RMA number clearly on the outside of the box ZIATECH WARRANTY Warranty information for Ziatech products is available at Ziatech s website located at http www ziatech com TRADEMARKS EIS...

Страница 49: ...e San Luis Obispo CA 93401 USA Tel 805 541 0488 FAX 805 541 5088 E Mail tech_support ziatech com Internet http www ziatech com Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE...

Страница 50: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

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