USB97CFDC datasheet(7/20 Pages) SMSC

7 / 20 page

SMSC DS – USB97CFDC

Page 7

Rev. 12/15/2000

BLOCK DIAGRAM

Pin Descriptions

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

FLOPPY DISK INTERFACE

Read Disk

Data

nRDATA

Raw serial bit stream from the disk drive, low

active.

Each falling edge represents a flux

transition of the encoded data.

Write

Data

nWDATA

OD12

This active low high current driver provides the

encoded data to the disk drive. Each falling edge

causes a flux transition on the media.

Head

Select

nHDSEL

OD12

This high current output selects the floppy disk

side for reading or writing. A logic "1" on this pin

means side 0 will be accessed, while a logic "0"

means side 1 will be accessed.

Direction

Control

nDIR

OD12

This high current low active output determines the

direction of the head movement.

A logic "1" on

this pin means outward motion, while a logic "0"

means inward motion.

Step Pulse

nSTEP

OD12

This active low high current driver issues a low

pulse for each track-to-track movement of the

head.

Disk Change

nDSKCHG

This input senses that the drive door is open or

that the diskette has possibly been changed since

the last drive selection.

8051 CPU

8237

4k Data Buffer RAM

Memory

Management

Unit

Map RAM

Arbiter

SIE DMA

RX/

Queue

End Point

Control

Serial Interface Engine

GPIO

nMEMEN

FD[7:0]

nFRD

nFCE

Option

Select/

Drive

Control

Flash/

SRAM

Interface

IRQ0

SD[7:0]

SA[13:0]

nIOW

nIOR

nMEMW

nMEMR

High Speed

USB

XCVR

To USB Bus

FA[15:0]

FLOPPY DISK

CONTROLLER

DRQ2

nDAK2

ADDRESS

DECODE

nCE

AEN

SRAM

Interface

nTRK0, nINDEX,

nWRTPRT, nDSKCHG

nRDATA, DRVDEN0,

DRVDEN1, nWDATA,

nWGATE, nHDSEL,

nDIR, nMTR0, nDS0,

nSTEP

DRIVE

INTERFACE

CLOCK

CONTROL

nOPTEN

nDRVRDY

nFDPWR

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