Ultra Fast USB 2.0 Memory Stick Flash Media Controller

Datasheet

Chapter 5 Pin Descriptions

This section provides a detailed description of each signal. The signals are arranged in functional groups according to their associated interface.

The “n” symbol in the signal name indicates that the active, or asserted, state occurs when the signal is at a low voltage level. When “n” is not present before the signal name, the signal is asserted at the high voltage level.

The terms assertion and negation are used exclusively. This is done to avoid confusion when working with a mixture of “active low” and “active high” signals. The term assert, or assertion, indicates that a signal is active, independent of whether that level is represented by a high or low voltage. The term negate, or negation, indicates that a signal is inactive.

5.1Pin Descriptions

Table 5.2 USB2242/2242i 36-Pin QFN Pin Descriptions

 

 

 

BUFFER

 

NAME

SYMBOL

36-PIN QFN

TYPE

DESCRIPTION

 

 

 

 

 

 

 

MEMORY STICK INTERFACE

 

 

 

 

 

MS System Data

MS_D[7:0]

8

I/O12PD

These pins are the bi-directional data

In/Out

 

7

 

signals for the MS device. In serial mode,

 

 

4

 

the most significant bit (MSB) of each byte

 

 

5

 

is transmitted first by either MSC or MS

 

 

23

 

device on MS_D0. MS_D0, MS_D2, and

 

 

20

 

MS_D3 have weak pull-down resistors.

 

 

10

 

MS_D1 has a pull down resistor if it is in

 

 

11

 

parallel mode, otherwise it is disabled. In

 

 

 

 

4 or 8 bit parallel mode, there is a weak

 

 

 

 

pull-down resistor on all MS_D7 - 0

 

 

 

 

signals. The resistors are controlled by

 

 

 

 

MSC_SYSTEM_0, MSC_MODE_CTL and

 

 

 

 

MSC_PRO_HG registers.

 

 

 

 

 

MS Bus State

MS_BS

9

O12

This pin is connected to the BS pin of the

 

 

 

 

MS device.

 

 

 

 

It is used to control the Bus States 0, 1, 2

 

 

 

 

and 3 (BS0, BS1, BS2 and BS3) of the MS

 

 

 

 

device.

 

 

 

 

 

MS System CLK

MS_SCLK

30

O12

This pin is an output clock signal to the

 

 

 

 

MS device.

 

 

 

 

The clock frequency is software

 

 

 

 

configurable.

 

 

 

 

 

MS Card Insertion

GPIO12

24

IPU

This is a GPIO designated as the Memory

GPIO

(MS_INS)

 

 

StickTM card detection pin.

 

 

USB INTERFACE

 

 

 

 

 

 

USB Bus Data

USB+

2

I/O-U

These pins connect to the USB bus data

 

USB-

3

 

signals.

 

 

 

 

 

Revision 1.0 (05-27-08)

10

SMSC USB2242/USB2242i

DATASHEET