USB2250 datasheet(16/36 Pages) SMSC

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Ultra Fast USB 2.0 Multi-Format Flash Media Controller

Datasheet

Revision 2.6 (05-08-08)

SMSC USB2250/51/59

DATASHEET

SM Address

Strobe

SM_ALE

O12PD

This pin is an active high Address Latch Enable

signal for the SM device.

This pin has a weak pull-down resistor that is

permanently enabled.

SM Command

Strobe

SM_CLE

O12PD

This pin is an active high Command Latch Enable

signal for the SM device.

This pin has a weak pull-down resistor that is

permanently enabled.

SM Data 7-0

SM_D[7:0]

I/O12PD

These pins are the bi-directional data signals

SM_D7-SM_D0.

The bi-directional data signal has an internal weak

pull-down resistor.

SM Read

Enable

SM_nRE

O12PU

This pin is an active low read strobe signal for SM

device.

When using the internal FET, this pin has an

internal weak pull-up resistor that is tied to the

output of the internal Power FET, and is controlled

by the SM_PU bit of the SMC_CTL register.

If an external FET is used (Internal FET is

disabled), then the internal pull-up is not available

(external pull-ups must be used).

SM Write

Enable

SM_nWE

O12PU

This pin is an active low write strobe signal for SM

device.

When using the internal FET, this pin has an

internal weak pull-up resistor that is tied to the

output of the internal Power FET, and is controlled

by the SM_PU bit of the SMC_CTL register.

If an external FET is used (Internal FET is

disabled), then the internal pull-up is not available

(external pull-ups must be used).

SM Write

Protect Switch

SM_nWPS

IPU

A write-protect seal is detected when this pin is

low.

This pin has an internal weak pull-up resistor that

is controlled by the SM_INTF_EN bit of the

SMC_MODE_CTL2 register.

SM Busy or

Data Ready

SM_nBR

IPU

This pin is connected to the BSY/RDY pin of the

SM device.

When using the internal FET, this pin has an

internal weak pull-up resistor that is tied to the

output of the internal Power FET, and is controlled

by the SM_PU bit of the SMC_CTL register.

If an external FET is used (Internal FET is

disabled), then the internal pull-up is not available

(external pull-ups must be used).

Table 5.1 USB2250/51/59 128-Pin VTQFP Pin Descriptions (continued)

NAME

SYMBOL

128-PIN

VTQFP

BUFFER

TYPE

DESCRIPTION

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