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USB97CFDC2-MV-01X

USB Floppy Disk Controller

SMSC -> Microchip 

PIN NO.

NAME

BUFFER

SYMBOL

TYPE

DESCRIPTION

USB INTERFACE

59

USB Bus

USB-

61

Data

USB+

IO-U

These pins connect to the USB data signals

through 33 ohm series resistors. The USB+ line

should be pulled up with a 5%, 1.5K ohm resistor

to indicate that this is a high speed USB device.

58

USB

AVDD

Transceiver

Supply

This is the 3.3V supply to the internal USB

transceiver.

62

USB

AGND

Transceiver

Ground

This is the supply ground for the internal USB

transceiver.

PROGRAM MEMORY INTERFACE

38-35

Program

FD[3:0]/

Memory Data OPT[3:0]

Bus/Option

Select

IO8 These signals are used to transfer data between

the internal 8051 and the external program

memory when operating in external program

memory mode (See ROMEN pin). When operating

from internal program memory, the OPT3 pin must

be tied high thru a resistor and the OPT[2:0] pins

tied low thru a resistor (See configuration

description section). These pins are not driven

while the USB97CFDC2-01 is in SUSPEND mode

and internal ROM mode is active. They are driven

while in SUSPEND in external ROM mode..

34

Program

FD4/IN0

Memory Data

Bus/EEPROM

Input

IO8 This signal is used to transfer data between the

internal 8051 and the external program memory

when operating in external program memory mode

(See ROMEN pin). When operating from internal

program memory, this pin is the input data from an

external serial EEPROM that contains

manufacturer specific ID and string information, as

required by the USB specification, and drive

options. This pin is not driven while the

USB97CFDC2-01 is in SUSPEND mode and

internal ROM mode is active. It is driven while in

SUSPEND in external ROM mode...

33-31

Program

FD[7:5]/

Memory Data OUT[2:0]

Bus/EEPROM

Output

IO8 This signal is used to transfer data between the

internal 8051 and the external program memory

when operating in external program memory mode

(See ROMEN pin). When operating from internal

program memory, these pins are the output data

and strobes to an external serial EEPROM that

contains manufacturer specific ID and string

information, as required by the USB specification,

and drive options. These pins are driven while the

USB97CFDC2-01 is in SUSPEND mode.

50, 53, 54,

49, 57, 29,

56, 55, 48-

44, 42-40,

Flash Memory FA[15:0]

Address Bus

O8 These signals address memory locations within the

FLASH memory.

28

Flash Memory nFRD

Read Strobe

O8 Flash ROM Read; active low

30

Flash Memory nFCE

Chip Select

O8 Flash ROM Chip Select; active low

MISCELLANEOUS

17

Crystal

XTAL1/

Input/External CLKIN

Clock Input

ICLKx

14.318Mhz Crystal or clock input.

This pin can be connected to one terminal of the

crystal or can be connected to an external

14.318Mhz clock when a crystal is not used.

SMSC DS – USB97CFDC2-01

Page 9

Rev. 02-27-07

DATASHEET

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