CY7C656xx
Document Number: 38-08037 Rev. *M
Page 3 of 25
Introduction
EZ-USB HX2LP™ is Cypress’s next generation family of high
performance, low power USB 2.0 hub controllers. HX2LP is an
ultra low power single chip USB 2.0 hub controller with integrated
upstream and downstream transceivers, a USB Serial Interface
Engine (SIE), USB Hub Control and Repeater logic, and Trans-
action Translator (TT) logic. Cypress has also integrated many
of the external passive components, such as pull up and pull
down resistors, reducing the overall bill of materials required to
implement a hub design. The HX2LP portfolio consists of:
1. CY7C65630: 4-port/single transaction translator
This device option is for ultra low power applications that require
four downstream ports. All four ports share a single transaction
translator. The CY7C65630 is available in 56 QFN and is also
pin-for-pin compatible with the CY7C65640.
2. CY7C65620:
This device option is for a 2-port bus powered application. Both
ports share a single transaction translator. The CY7C65620 is
available in a 56 QFN.
All device options are supported by Cypress’s world class
reference design kits, which include board schematics, bill of
materials, Gerber files, Orcad files, and thorough design
documentation.
USB Serial Interface Engine
The Serial Interface Engine (SIE) allows the CY7C656xx to
communicate with the USB host. The SIE handles the following
USB activities independently of the Hub Control Block.
■ Bit stuffing/unstuffing
■ Checksum generation/checking
■ TOKEN type identification
■ Address checking.
Hub Repeater
The Hub Repeater manages the connectivity between upstream
and downstream facing ports that are operating at the same
speed. It supports full or low speed connectivity and high speed
connectivity. According to the USB 2.0 specification, the HUB
Repeater provides the following functions:
■ Sets up and tears down connectivity on packet boundaries
■ Ensures orderly entry into and out of the Suspend state,
including proper handling of remote wakeups.
Transaction Translator
The Transaction Translator translates data from one speed to
another. A TT takes high speed split transactions and translates
them to full or low speed transactions when the hub is operating
at high speed (the upstream port is connected to a high speed
host controller) and has full or low speed devices attached. The
operating speed of a device attached on a downstream facing
port determines whether the Routing Logic connects a port to the
TT or Hub Repeater. If a full or low speed device is connected to
the hub operating at high speed, the data transfer route includes
the TT. If a high speed device is connected to this high speed
hub, the route only includes the repeater and no TT, because the
device and the hub are operating at the same speed. When the
hub is operating at full speed (the upstream port is connected to
a full speed host controller), a high speed peripheral does not
operate at its full capability. These devices only work at full
speed. Full and low speed devices connected to this hub operate
at their normal speed.
Applications
Typical applications for the HX2LP device family are:
■ Standalone hubs
■ Motherboard hubs
■ Monitor hubs
■ Advanced port replicators
■ Docking stations
■ Split-PC designs
■ External personal storage drives
■ Keyboard hubs
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