Smsc USB97C242 Manual de usuario descargar pdf (Pagina 13)

USB 2.0 Flash Drive Controller

Datasheet

SMSC USB97C242 Page 13 Revision 1.4 (05-03-07)

DATASHEET

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

Card

Detection

nCD IPU This is the card detection signal from SM device to indicate if the device

is inserted.

This pin has internal weak pull-up resistor.

USB INTERFACE

USB Bus

Data

USB-

USB+

I/O-U These pins connect to the USB bus data signals.

USB

Transceiver

Filter

LOOPFLTR This pin provides the ability to supplement the internal filtering of the

transceiver with an external network, if required.

USB

Transceiver

Bias

RBIAS A precision 9.09K resistor is attached from ground to this pin to set the

transceiver’s internal bias currents.

Termination

Resistor

RTERM A precision 1.5K resistor is attached to this pin from a 3.3V supply.

Full Speed

USB Data

FS-

FS+

I/O-U These pins connect to the USB- and USB+ pins through 31.6 ohm series

resistors.

MEMORY/IO INTERFACE

Memory

Data Bus

MD[7:0] I/OPU8 When ROMEN = 0, these signals are used to transfer data between the

internal CPU and the external program memory.

When ROMEN = 1, internal weak pull up are activated to prevent these

pins from floating.

Memory

Address

Bus

MA[15:0] O8 These signals address memory locations within the external memory.

Memory

Read

Strobe

nMWR O8 Program Memory Write; active low

Memory

Read

Strobe

nMRD O8 Program Memory Read; active low

Memory

Chip

Enable

nMCE O8 Program Memory Chip Enable; active low.

This signal shall be de-asserted, when all of the following conditions are

met:

IDLE bit (PCON.0) is 1.

INT2 is negated

SLEEP bit of CLOCK_SEL is 1.

This signal shall be asserted whenever any of the three conditions are

no longer met.

I/O Read

Strobe

nIOR O8 This is a active low I/O Read strobe signal of Xdata bus.

I/O Write

Strobe

nIOW. O8 This is a active low I/O Write strobe signal of Xdata bus.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 22 23

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