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Ultra Fast USB 2.0 Multi-Format Flash Media Controller/USB Hub Combo
SMSC USB2640/USB2641 19 Revision 2.0 (10-03-08)
DATASHEET
MS System Data
In/Out
MS_D[7:0] 20
19
17
18
32
30
23
24
I/O12PD 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.
SECURE DIGITAL / MULTIMEDIACARD INTERFACE
SD Data 7-0 SD_D[7:0] 19
20
23
30
32
33
17
18
I/O12PU These are the bi-directional data signals SD_D0-
SD_D7.
SD_D0 - SD_D7 have weak pull-up resistors.
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
Protected GPIO
GPIO6 /
SD_WP
13 I/O12 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.
SD Card Detect
GPIO
GPIO15 /
SD_nCD
14 I/O12 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.
USB INTERFACE
USB Bus Data USB-
USB+
43
42
I/O-U These pins connect to the upstream USB bus data
signals.
USB Bus Data USBDN_DM
[3:2]
USBDN_DP
[3:2]
3
1
4
2
I/O-U These pins connect to the downstream USB bus
data signals.
Table 6.1 USB2640/USB2641 Pin Descriptions (continued)
NAME SYMBOL
48-PIN
QFN
BUFFER
TYPE DESCRIPTION