Ultra Fast USB 2.0 Multi-Format Flash Media Controller/USB Hub Combo

Table 6.1 USB2640/USB2641 Pin Descriptions (continued)

 

 

48-PIN

 

BUFFER

 

NAME

SYMBOL

QFN

 

TYPE

DESCRIPTION

 

 

 

 

 

 

MS System Data

MS_D[7:0]

20

 

I/O12PD

These pins are the bi-directional data signals for

In/Out

 

19

 

 

the MS device. In serial mode, the most significant

 

 

17

 

 

bit (MSB) of each byte is transmitted first by either

 

 

18

 

 

MSC or MS device on MS_D0.

 

 

32

 

 

MS_D0, MS_D2, and MS_D3 have weak pull-

 

 

30

 

 

 

 

23

 

 

down resistors. MS_D1 has a pull down resistor if

 

 

24

 

 

in parallel mode, otherwise it is disabled. In 4 or 8

 

 

 

 

 

bit parallel modes, there is a weak pull-down

 

 

 

 

 

resistor on all MS_D7 - MS_D0 signals.

 

 

 

 

 

The resistors are controlled by MSC_SYSTE_0,

 

 

 

 

 

MSC_MODE_CTL and MSC_PRO_HG registers.

 

 

 

 

 

 

SECURE DIGITAL / MULTIMEDIACARD INTERFACE

 

 

 

 

 

 

SD Data 7-0

SD_D[7:0]

19

 

I/O12PU

These are the bi-directional data signals SD_D0-

 

 

20

 

 

SD_D7.

 

 

23

 

 

SD_D0 - SD_D7 have weak pull-up resistors.

 

 

30

 

 

 

 

32

 

 

 

 

 

33

 

 

 

 

 

17

 

 

 

 

 

18

 

 

 

 

 

 

 

 

 

SD Clock

SD_CLK

21

 

O12

This is an output clock signal to SD/MMC device.

 

 

 

 

 

The clock frequency is software configurable.

 

 

 

 

 

 

SD Command

SD_CMD

24

 

I/O12PU

This is a bi-directional signal that connects to the

 

 

 

 

 

CMD signal of the SD/MMC device.

 

 

 

 

 

The bi-directional signal should have an internal

 

 

 

 

 

weak pull-up resistor.

 

 

 

 

 

The pull-up register can be controlled by:

 

 

 

 

 

SD_MMC_INTF_EN bit of SDC_MODE CTL.

 

 

 

 

 

 

SD Write

GPIO6 /

13

 

I/O12

GPIO: This general purpose pin may be used

Protected GPIO

SD_WP

 

 

 

either as input, edge sensitive interrupt input, or

 

 

 

 

 

output.

 

 

 

 

 

 

 

 

 

 

 

SD_WP: This is a GPIO designated as the Secure

 

 

 

 

 

Digital card mechanical write detect pin.

 

 

 

 

 

 

SD Card Detect

GPIO15 /

14

 

I/O12

GPIO:This general purpose pin may be used

GPIO

SD_nCD

 

 

 

either as input, edge sensitive interrupt input, or

 

 

 

 

 

output.

 

 

 

 

 

 

 

 

 

 

 

SD_nCD: This is a GPIO designated as the

 

 

 

 

 

Secure Digital card detection pin.

 

 

 

 

 

 

 

 

 

USB INTERFACE

 

 

 

 

 

 

USB Bus Data

USB-

43

 

I/O-U

These pins connect to the upstream USB bus data

 

USB+

42

 

 

signals.

 

 

 

 

 

 

USB Bus Data

USBDN_DM

3

 

I/O-U

These pins connect to the downstream USB bus

 

[3:2]

1

 

 

data signals.

 

USBDN_DP

4

 

 

 

 

[3:2]

2

 

 

 

 

 

 

 

 

 

SMSC USB2640/USB2641

19

Revision 2.0 (10-03-08)

 

DATASHEET