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CY7C65620-56LTXCT Datasheet(PDF) 4 Page - Cypress Semiconductor |
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CY7C65620-56LTXCT Datasheet(HTML) 4 Page - Cypress Semiconductor |
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4 / 29 page  CY7C65620/CY7C65630 Document Number: 38-08037 Rev. *T Page 4 of 29 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 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: ■ 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. ■ CY7C65620: 2-port/single transaction translator 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 CY7C65620/CY7C65630 to communicate with the USB host. The SIE handles the following USB activities independently of the Hub Control Block. ■ Bit stuffing and unstuffing ■ Checksum generation and 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 TT 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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