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Ultra Fast USB 2.0 Multi-Slot Flash Media Controller
Datasheet
SMSC USB2250/50i/51/51i 15 Revision 1.1 (05-29-08)
DATASHEET
MS System Data
In/Out
MS_D0 /
MS_SDIO
94 I/O12PD MS_D0: This pin is one of 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 the
MS device on MS_D0, MS_D0, MS_D2, and
MS_D3 (which have weak pull-down
resistors). MS_D1 has a pull-down resistor
if it is in parallel mode; Otherwise, it is
disabled. In 4- or 8-bit parallel mode, all
MS_D7~0 signals have a weak pull-down
resistor. The resistors are controlled by
MSC_SYSTEM_0, MSC_MODE_CTL and
MSC_PRO_HG registers.
MS_SDIO: Serial Data Bus. Responsible for
transfer direction and types of data change
depending on the Bus State.
SD / MMC INTERFACE
SD Data 7-0 SD_D[7:0] 13
11
19
21
22
23
10
12
I/O12PU These are the bi-directional data signals
SD_D0 - SD_D7.
The bi-directional signals should have weak
pull-up resistors. The register can be
controlled by the SD_MMC_INTF_EN bit of
SDC_MODE_CTL.
SD Clock SD_CLK 18 O12 This is an output clock signal to the SD/MMC
device.
The clock frequency is software configurable.
SD Command SD_CMD 20 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)
105 I/O12 This is a GPIO designated as the Secure
Digital card mechanical write detect pin.
SD Card Detect
GPIO
GPIO15
(SD_nCD)
32 I/O12 This is a GPIO designated as the Secure
Digital card detection pin.
USB INTERFACE
USB Bus Data USB+
USB-
7
8
I/O-U These pins connect to the USB bus data
signals.
USB Transceiver
Bias
RBIAS 127 I-R A 12.0k, 1.0% resistor is attached from
VSSA to this pin in order to set the
transceiver's internal bias currents.
Table 5.1 USB2250/50i/51/51i 128-Pin VTQFP Pin Descriptions (continued)
NAME SYMBOL
128-PIN
VTQFP
BUFFER
TYPE DESCRIPTION