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CY7C65640A-LTXCT Datasheet(PDF) 3 Page - Cypress Semiconductor |
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CY7C65640A-LTXCT Datasheet(HTML) 3 Page - Cypress Semiconductor |
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3 / 25 page  CY7C65640A Document Number: 38-08019 Rev. *N Page 3 of 25 Introduction Cypress’s TetraHub is a high performance self powered Universal Serial Bus (USB) 2.0 hub. The Tetra architecture provides four downstream USB ports, with a Transaction Translator (TT) for each port, making it the highest performing hub possible. This single-chip device incorporates one upstream and four downstream USB transceivers, a serial Interface Engine (SIE), USB hub controller and repeater, and four TTs. It is suitable for standalone hubs, motherboard hubs, and monitor hub applications. Being a fixed-function USB device, there is no risk or added engineering effort required for firmware development. The developer does not need to write any firmware for their design. The CY4602 Tetrahub USB 2.0 4-port Hub Reference Design Kit provides all materials and documents needed to move rapidly into production. The reference design kit includes board schematics, bill of materials, Gerber files, Orcad files, key application notes, and product description. CY7C65640A-LFXC is a functional and pin equivalent die revision of Cypress’s CY7C65640-LFXC. Changes were made to improve device performance. TetraHub Architecture The Logic Block Diagram on page 1 shows the TetraHub Architecture. USB Serial Interface Engine (SIE) The SIE enables the CY7C65640A to communicate with the USB host through the USB repeater component of the hub. The SIE handles the following USB bus activity independently of the Hub Control Block: ■ Bit stuffing/unstuffing ■ Checksum generation/checking ■ ACK/NAK/STALL ■ TOKEN type identification ■ Address checking. Hub Controller The hub control block does the following protocol handling at a higher level: ■ Coordinate enumeration by responding to SETUP packets ■ Fill and empty the FIFOs ■ Suspend/Resume coordination ■ Verify and select DATA toggle values ■ Port power control and overcurrent detection. The Hub controller provides status and control and permits host access to the hub. Hub Repeater The hub repeater manages the connectivity between upstream and downstream facing ports that are operating at the same speed. It supports full/low speed connectivity and high speed connectivity. According to 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/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/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 transaction translator or hub repeater section. If a low or full speed device is connected to the hub operating at high speed, the data transfer route includes the transaction translator. If a high speed device is connected to this high speed hub the route only includes the repeater and no transaction translator; the device and the hub are in conformation with respect to their data transfer 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 1.1 speed. Full and low speed devices connected to this hub operate at their 1.1 speed. Applications ■ Standalone Hubs ■ Motherboard Hubs ■ Monitor Hub applications ■ External Personal Storage Drives ■ Port Replicators ■ Portable Drive ■ Docking Stations [+] Feedback |
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