EVB-USB4640 SMSC, EVB-USB4640 Datasheet - Page 16

• Manufacturer Part Number: EVB-USB4640
• Description: EVALUATION BOARD FOR USB4640
• Manufacturer: SMSC

Specifications of EVB-USB4640

• Main Purpose: Interface, USB 2.0 Hub
• Embedded: *
• Utilized Ic / Part: USB4640
• Primary Attributes: *
• Secondary Attributes: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1107

Revision 1.0 (06-09-09)
XTAL1 (CLKIN)
PRTCTL[3:2]
SD_D[7:0]
SYMBOL
SD_CMD
GPIO15 /
SD_nCD
SD_CLK
RBIAS
XTAL2
48-PIN
QFN
47
45
44
19
20
23
30
32
33
17
18
21
24
14
7
6
Table 6.1 USB4640/USB4640i Pin Descriptions (continued)
(Table
BUFFER
I/OD6PU
OCLKx
I/O8PU
I/O8PU
I/O8PU
ICLKx
TYPE
I/O6
I-R
O8
6.2)
SECURE DIGITAL INTERFACE
DESCRIPTION
USB Power Enable
As an output, these pins enable power to downstream USB
peripheral devices and have weak internal pull-up resistors. See
Section 6.3, "Port Power Control"
As an input, when the power is enabled, these pins monitor the over-
current condition. When an over-current condition is detected, the
pins turn the power off.
USB Transceiver Bias
A 12.0 k
to set the transceiver's internal bias currents.
24 MHz Crystal Input or External Clock Input
This pin can be connected to one terminal of the crystal or it can be
connected to an external 24 MHz clock when a crystal is not used.
24 MHz Crystal Output
This is the other terminal of the crystal or it is left open when an
external clock source is used to drive XTAL1(CLKIN).
Secure Digital Data 7-0
These are the bi-directional data signals SD_D0 - SD_D7 with weak
pull-up resistors.
Secure Digital Clock
This is an output clock signal to the SD/MMC device.
Secure Digital Command
This is a bi-directional signal that connects to the CMD signal of the
SD/MMC device. The bi-directional signal has a weak internal pull-
up resistor.
This general purpose pin may be used either as input, edge sensitive
interrupt input, or output. Custom firmware is required to activate this
function.
Secure Digital Card Detect GPIO
This is a GPIO designated by the default firmware as the Secure
Digital card detection pin and has an internal pull-up.
DATASHEET
High Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
Ω
,
16
±
1.0% resistor is attached from VSS to this pin in order
for diagram and usage instructions.
SMSC USB4640/USB4640i
Datasheet