Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property
damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of
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Revision 1.91 (08-22-07)
2
SMSC USB2524
PRODUCT PREVIEW
USB MultiSwitch
TM
Hub
General Description
The SMSC 4-Port USB 2.0 Switching Hub Controller acts as two independently controllable USB 2.0
Hubs in a single package with the ability to electronically reassign and reconfigure any of its 4
downstream ports to either of its two upstream USB ports. This allows two USB hosts to share
peripherals and to dynamically reconfigure them.
Any configuration of the downstream ports is possible except simultaneous connection to both
upstream ports. Up to 8 different configurations can be selected by a dedicated 3-pin interface, or the
4-pin interface can be used to directly assign each port to either of the upstream hosts. An external
serial EEPROM (or SMBus Host) is used to store the 8 different configuration parameters. However,
8 predefined configurations, as well as generic VID/PID/DID information, are provided as defaults if no
external Serial EEPROM is detected at power up. The SMBus interface can be used to configure the
hub as well as dynamically re-assigning downstream ports to upstream hosts. The SMBus interface
can be “live” while the hub is operational, and allows an external SMBus host to have full access to
re-assign ports on an as-needed basis.
The SMSC 4-Port Switching Hub is fully compliant with the USB 2.0 Specification and will attach to
either or both upstream USB hosts as a Full-Speed Hub or as a Full-/High-Speed Hub. The 4
downstream Hub ports support Low-Speed, Full-Speed, and High-Speed (if operating as a High-Speed
Hub) downstream devices on all of the enabled downstream ports.
A USB peripheral or USB Hub that is attached to one of the downstream USB2524 ports will be
available to one or the other of the upstream USB host controllers, but can never be simultaneously
shared with both host controllers. The user can switch a peripheral from one host to the other (on-the-
fly), and the peripheral will automatically detach from one host and attach to the other host. Each host
will only configure and control the downstream ports that are assigned to it, including full USB power
management and suspend/resume operations.
The USB2524 works with an external USB power distribution switch device to control V
BUS
switching
to downstream ports, and to limit current and sense over-current conditions.
All required resistors on the USB ports are integrated into the Hub. This includes all series termination
resistors on D+ and D– pins and all required pull-down and pull-up resistors on D+ and D– pins. The
over-current sense inputs for the downstream facing ports have internal pull-up resistors.
Throughout this document the upstream facing port of the hub will be referred to as the upstream port,
and the downstream facing ports will be called the downstream ports.
For performance reasons, the Hub provides 1 Transaction Translator (TT) per port (defined as Multi-
TT configuration), and each TT has 1512 bytes of periodic buffer space and 272 Bytes of non- periodic
buffer space (divided into 4 non-periodic buffers per TT), for a total of 1784 bytes of buffer space for
each Transaction Translator.
When configured as a Single-TT Hub (required by USB 2.0 Specification), the Single Transaction
Translator will have 1512 bytes of periodic buffer space and 272 bytes of non-periodic buffer space
(divided into 4 non-periodic buffers per TT), for a total of 1784 bytes of buffer space for the entire
Transaction Translator.
SMSC USB2524
3
Revision 1.91 (08-22-07)
PRODUCT PREVIEW
USB MultiSwitch
TM
Hub
OEM Selectable Features
A default configuration is available in the USB2524 following a reset. This configuration may be
sufficient for some applications. Strapping option pins make it possible to modify a limited sub-set of
the configuration options.
The USB2524 may also be configured by an external EEPROM or a microcontroller. When using the
microcontroller interface, the Hub appears as an SMBus slave device. If the Hub is pin-strapped for
external EEPROM configuration but no external EEPROM is present, then a value of ‘0’ will be written
to all configuration data bit fields (the hub will attach to the host with all ‘0’ values).
The USB2524 supports several OEM selectable features:
Optional OEM configuration via I2C EEPROM or via the industry standard SMBus interface from
an external SMBus Host or Microcontroller.
Compound device support (port is permanently hardwired to a downstream USB peripheral device).
Hardware strapping options enable configuration of the following features (when not configured via
an EEPROM or SMBus host).
Non-Removable Ports
Port Power Polarity (active high or active low logic)
Selection of Single (STT) or Multi-Transaction Translator (MTT) capability.
Selection of Over-Current sensing and Port power control on a individual (port-by-port) or ganged
(all ports together) to match the OEM’s choice of circuit board component selection.
Selection of end-user method of switching ports between hosts
-Embedded Mode: 8 default configurations that are controlled by OEM programmable registers (or
Internal default settings).
-Peripheral Mode: Each wire directly controls one of the 4 downstream ports. The interface is
selectable between edge triggered operation or level triggered operation for compatibility with many
different mechanical switch configurations or direct control from an external Microcontroller’s GPIO
pins.
Enablement of String Descriptor Support, along with the capability to customize each of the 3
different string descriptors (up to a maximum size of 31 characters each)
Selection of LED Mode: USB Mode, Host Ownership Mode, or Host Ownership Mode with Speed
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