USB2640I Standard Microsystems Corp., USB2640I Datasheet - Page 19

• Manufacturer Part Number: USB2640I
• Description: Industrial Temperature Usb 2.0 Flash Media Controller And Usb Hub Combo
• Manufacturer: Standard Microsystems Corp.

Industrial Temperature USB 2.0 Flash Media Controller and USB Hub Combo
SMSC USB2640i/USB2641i
MS System Data
In/Out
SD Data 7-0
SD Clock
SD Command
SD Write
Protected GPIO
SD Card Detect
GPIO
USB Bus Data
USB Bus Data
NAME
USBDN_DM
USBDN_DP
MS_D[7:0]
SD_D[7:0]
SYMBOL
SD_CMD
GPIO15 /
SD_CLK
SD_nCD
GPIO6 /
SD_WP
USB+
USB-
Table 6.1 USB2640i/USB2641i Pin Descriptions (continued)
[3:2]
[3:2]
SECURE DIGITAL / MULTIMEDIACARD INTERFACE
48-PIN
QFN
20
19
17
18
32
30
23
24
19
20
23
30
32
33
17
18
21
24
13
14
43
42
3
1
4
2
USB INTERFACE
DATASHEET
BUFFER
I/O12PD
I/O12PU
I/O12PU
TYPE
I/O12
I/O12
I/O-U
I/O-U
O12
19
DESCRIPTION
These pins are the bi-directional data signals for
the MS device. In serial mode, the most significant
bit (MSB) of each byte is transmitted first by either
MSC or MS device on MS_D0.
MS_D0, MS_D2, and MS_D3 have weak pull-
down resistors. MS_D1 has a pull down resistor if
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.
These are the bi-directional data signals SD_D0-
SD_D7.
SD_D0 - SD_D7 have weak pull-up resistors.
This is an output clock signal to SD/MMC device.
The clock frequency is software configurable.
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.
GPIO: This general purpose pin may be used
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.
GPIO:This general purpose pin may be used
either as input, edge sensitive interrupt input, or
output.
SD_nCD: This is a GPIO designated as the
Secure Digital card detection pin.
These pins connect to the upstream USB bus data
signals.
These pins connect to the downstream USB bus
data signals.
Revision 2.0 (10-03-08)