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CY7C65642 Datasheet(PDF) 3 Page - Cypress Semiconductor |
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CY7C65642 Datasheet(HTML) 3 Page - Cypress Semiconductor |
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3 / 21 page  CY7C65642 Document Number: 001-65659 Rev. *B Page 3 of 21 Introduction HX2VL is Cypress’s next generation family of high- performance, very low-power USB 2.0 hub controllers. HX2VL has integrated upstream and downstream transceivers; a USB serial interface engine (SIE); USB hub control and repeater logic; and transaction translator (TT) logic. Cypress has also integrated external components such as voltage regulator and pull-up/pull-down resistors, reducing the overall BOM required to implement a USB hub system. The CY7C65642 is a part of the HX2VL portfolio with four downstream ports and an independent TT dedicated for each downstream port. This device option is for low-power but high- performance applications that require up to four downstream ports. The CY7C65642 is available in 48-pin TQFP and 28-pin QFN package options. All device options are supported by Cypress’s world class reference design kits, which include board schematics, BOM, Gerber files, Orcad files, and thorough design documentation. HX2VL Architecture The “Block Diagram” on page 1 shows the HX2VL TetraHub™ architecture. USB Serial Interface Engine The SIE allows HX2VL 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. HS USB Control Logic ‘Hub Control’ block co-ordinates enumeration, suspend and resume. It generates status and control signals for host access to the hub. It also includes the frame timer that synchronizes the hub to the host. It has status/control registers which function as the interface to the firmware in the MCU. 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 ‘Suspend’ state, including proper handling of remote wakeups. MCU The HX2VL has MCU with 2 K ROM and 64 byte RAM. The MCU operates with a 12 MHz clock to decode USB commands from host and respond to the host. It can also handle GPIO settings to provide higher flexibility to the customers and control the read interface to the EEPROM which has extended configuration options. 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 port determines whether the routing logic connects a port to the TT or to hub repeater. When the upstream host and downstream device are functioning at different speeds, the data is routed through the TT. In all other cases, the data is routed through the repeater. For example, If a full or low-speed device is connected to the high-speed host upstream through the hub, then the data transfer route includes TT. If a high-speed device is connected to the high-speed host upstream through the hub, the transfer route includes the repeater. When the hub is connected to a full-speed host controller upstream, then 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. Port Control The downstream ‘Port Control’ block handles the connect/disconnect and over current detection as well as the power enable and LED control. It also generates the control signals for the downstream transceivers. Applications Typical applications for the HX2VL device family are: ■ Docking stations ■ Standalone hubs ■ Monitor hubs ■ Multi-function printers ■ Digital televisions ■ Advanced port replicators ■ Keyboard hubs |
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