USB4640-HZH SMSC [SMSC Corporation], USB4640-HZH Datasheet - Page 15

• Manufacturer Part Number: USB4640-HZH
• Description: High Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
• Manufacturer: SMSC [SMSC Corporation]

High Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
Datasheet
Chapter 6 Pin Descriptions
SMSC USB4640/USB4640i
6.1
HSIC_STROBE
USBDN_DM
USBDN_DP
HSIC_DAT
HSIC_IMP
SYMBOL
[3:2]
[3:2]
This section provides a detailed description of each signal. The signals are arranged in functional
groups according to their associated interface. The pin descriptions below are applied when using the
internal default firmware and can be referenced in
Please reference
The “n” symbol in the signal name indicates that the active, or asserted, state occurs when the signal
is at a low voltage level. When “n” is not present in the signal name, the signal is asserted at a high
voltage level.
The terms assertion and negation are used exclusively. This is done to avoid confusion when working
with a mixture of “active low” and “active high” signals. The term assert, or assertion, indicates that a
signal is active, independent of whether that level is represented by a high or low voltage. The term
negate, or negation, indicates that a signal is inactive.
USB4640/USB4640i Pin Descriptions
48-PIN
QFN
39
42
43
3
1
4
2
(Table
Chapter 2, "Acronyms," on page 10
BUFFER
Table 6.1 USB4640/USB4640i Pin Descriptions
TYPE
I/O-U
I/O
I/O
I
6.2)
DOWNSTREAM USB INTERFACE
UPSTREAM HSIC INTERFACE
DESCRIPTION
HSIC Impedance Control
This pin selects the driver impedance of the HSIC_DAT and
HSIC_STROBE pins.
‘1’ = approximately 50
‘0’ = approximately 40
HSIC Data
This is the bi-directional double data rate (DDR) data signal that is
synchronous to the HSIC_STROBE signal as defined in the High-
Speed Inter-Chip USB Specification, Version 1.0.
HSIC Strobe
This pin is the bi-directional data strobe signal that is defined in the
High-Speed Inter-Chip USB Specification, Version 1.0.
USB Bus Data
These pins connect to the downstream USB bus data signals and
can be swapped using the PortSwap feature (See
"F1h: Port Swap," on page
DATASHEET
15
Chapter 8, "Configuration Options," on page
for a list of the acronyms used.
Ω
Ω
impedance
impedance
47).
Revision 1.0 (06-09-09)
Section 8.4.4.20,
28.