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GPIO4 数据表(PDF) 42 Page - Microchip Technology |
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GPIO4 数据表(HTML) 42 Page - Microchip Technology |
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42 / 60 page ![]() USB5806 DS00002236D-page 42 2016-2018 Microchip Technology Inc. 8.9.3 BILLBOARD DEVICE DESCRIPTORS The AlternateModeString and iAdditionalInfoURL descriptors can be configured in the hub to provide the user with addi- tional information about the Alternate Mode failure. TABLE 8-13: TIMER B: BILLBOARD DETACH TIMER MSB DETACH_TIMER_B_MSB (413Fh) Billboard Detach Timer A MSB BIT Name R/W Description 7:0 TIMEOUT R/W Timer B is started as soon as the host requests iAlternateModeString. Once the timer expires, the Billboard Class Device will automatically detach from the host and re-attach as the default WinUSB device. Increments of 10ms can be set. Note: The default value of 413Ch = D0h, 413Dh = 07h is equiv- alent to a 20s timeout. (07D0h = 2000d) TABLE 8-14: BILLBOARD DEVICE DESCRIPTORS Offset: 0 Offset: +1 Offset: +2 Offset: +3 iAdditionalInfoURL Default = 01h bNumberOfAlternate- Modes Default = 01h bPreferredAlternateMode Default = 00h VCONN Power[0] Default = 00h VCONN Power[1] Default = 80h bmConfigured[0] Default = 00h bmConfigured[1] Default = 00h bmConfigured[2] Default = 00h bmConfigured[3] Default = 00h bmConfigured[4] Default = 00h bmConfigured[5] Default = 00h bmConfigured[6] Default = 00h bmConfigured[7] Default = 00h bmConfigured[8] Default = 00h bmConfigured[9] Default = 00h bmConfigured[10] Default = 00h bmConfigured[11] Default = 00h bmConfigured[12] Default = 00h bmConfigured[13] Default = 00h bmConfigured[14] Default = 00h bmConfigured[15] Default = 00h bmConfigured[16] Default = 00h bmConfigured[17] Default = 00h bmConfigured[18] Default = 00h bmConfigured[19] Default = 00h bmConfigured[20] Default = 00h bmConfigured[21] Default = 00h bmConfigured[22] Default = 00h bmConfigured[23] Default = 00h bmConfigured[24] Default = 00h bmConfigured[25] Default = 00h bmConfigured[26] Default = 00h bmConfigured[27] Default = 00h |
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