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XR22417 Datasheet(PDF) 10 Page - Exar Corporation |
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XR22417 Datasheet(HTML) 10 Page - Exar Corporation |
10 / 17 page XR 22417 10/17 REV1A Applications Information (Continued) Configurations for Reduced Downstream Ports The number of usable downstream ports of the XR22417 may be configured using an external EEPROM. Additionally, the number of usable downstream ports may be reduced from 7 down to a minimum of 4 by strapping options on the device, shown in Table 2. Both the EEPROM values and the strapping options will change the bNbrPorts field of the hub descriptor reported to the USB host. LED pins for unusable downstream ports are disabled. Table 2: Strapping Options for Reducing Usable Downstream Ports Usable Downstream Ports LED7 LED6 4, 3, 2, 1 Logic ‘0’ Logic ‘0’ 5, 4, 3, 2, 1 Normal Logic ‘0’ 6, 5, 4, 3, 2, 1 Logic ‘0’ Normal 7, 6, 5, 4, 3, 2, 1 Normal Normal Configurations for Non-Removable Devices Non-removable devices are reported in the device removable field of the hub descriptor. They can be identified by strapping options. LED pins for non-removable downstream ports are disabled. Table 3: Strapping Options for Configuring Non-Removable Downstream Ports Non-Removable Downstream Ports LED4 LED3 LED2 None Normal Normal Normal 2 Normal Normal Logic ‘0’ 3, 2 Normal Logic ‘0’ Normal 3, 2, 1 Normal Logic ‘0’ Logic ‘0’ 4, 3, 2, 1 Logic ‘0’ Normal Normal 5, 4, 3, 2, 1 Logic ‘0’ Normal Logic ‘0’ 6, 5, 4, 3, 2, 1 Logic ‘0’ Logic ‘0’ Normal 7, 6, 5, 4, 3, 2, 1 Logic ‘0’ Logic ‘0’ Logic ‘0’ |
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Similar Description - XR22417 |
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