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ISP1122A Datasheet(PDF) 11 Page - NXP Semiconductors |
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ISP1122A Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 48 page  Philips Semiconductors ISP1122A USB stand-alone hub Preliminary specification Rev. 01 — 27 March 2000 11 of 48 9397 750 06986 © Philips Electronics N.V. 2000. All rights reserved. 8. Endpoint descriptions Each USB device is logically composed of several independent endpoints. An endpoint acts as a terminus of a communication flow between the host and the device. At design time each endpoint is assigned a unique number (endpoint identifier, see Table 5). The combination of the device address (given by the host during enumeration), the endpoint number and the transfer direction allows each endpoint to be uniquely referenced. The ISP1122A has two endpoints, endpoint 0 (control) and endpoint 1 (interrupt). [1] IN: input for the USB host; OUT: output from the USB host. 8.1 Hub endpoint 0 (control) All USB devices and functions must implement a default control endpoint (ID = 0). This endpoint is used by the host to configure the device and to perform generic USB status and control access. The ISP1122A hub supports the following USB descriptor information through its control endpoint 0, which can handle transfers of 64 bytes maximum: • Device descriptor • Configuration descriptor • Interface descriptor • Endpoint descriptor • Hub descriptor • String descriptor. 8.2 Hub endpoint 1 (interrupt) Endpoint 1 is used by the ISP1122A hub to provide status change information to the host. This endpoint can be accessed only after the hub has been configured by the host (by sending the Set Configuration command). Endpoint 1 is an interrupt endpoint: the host polls it once every 255 ms by sending an IN token. If the hub has detected no change in the port status it returns a NAK (Not AcKnowledge) response to this request, otherwise it sends the Status Change byte (see Table 6). Table 5: Hub endpoints Function Ports Endpoint identifier Transfer type Direction [1] Max. packet size (bytes) Hub 0: upstream 1 to 5: downstream 0 control OUT 64 IN 64 1 interrupt IN 1 |
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