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TUSB8040_1110 Datasheet(PDF) 21 Page - Texas Instruments |
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TUSB8040_1110 Datasheet(HTML) 21 Page - Texas Instruments |
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21 / 33 page  TUSB8040 www.ti.com SLLSE42F – SEPTEMBER 2010 – REVISED OCTOBER 2011 3.3.8 Device Removable Configuration Register Table 3-16. Register Offset 7h BIT NO. 7 6 5 4 3 2 1 0 RESET STATE 0 0 0 0 0 0 0 0 Table 3-17. Bit Descriptions – Device Removable Configuration Register BIT FIELD NAME ACCESS DESCRIPTION 7:4 RSVD RO Reserved. Read only, returns 0 when read. Removable. The bits in this field indicate whether a device attached to downstream ports 3 through 0 are removable or permanently attached. A value of 0 indicates the device attached to the port is not removable. A value of 1 indicates the device attached to the port is removable. Each bit corresponds directly to a downstream port, i.e. rmbl0 corresponds to downstream port 0. For the TUSB8040PFP: The default value for these bits are loaded at the de-assertion of reset with the value of 3:0 rmbl[3:0] RW Four-port hub - rmbl[3:0] defaults to 1111b. For the TUSB8040RKM: The default value for these bits are loaded at the de-assertion of reset with the value of LEDA[3:0]z_RMBL[3:0]: Four-port hub - rmbl[3:0] defaults to wxyzb, where w is LEDA3z_RMBL3, x is LEDA2z_RMBL2, y is LEDA1z_RMBL1 and z is LEDA0z_RMBL0. When in I2C/SMBus mode the bits in this field corresponding to the enabled ports per rmbl[3:0] may be over-written by EEPROM contents or by an SMBus host. 3.3.9 Port Used Configuration Register Table 3-18. Register Offset 8h BIT NO. 7 6 5 4 3 2 1 0 RESET STATE 0 0 0 0 0 0 0 0 Table 3-19. Bit Descriptions – Port Used Configuration Register BIT FIELD NAME ACCESS DESCRIPTION 7:4 RSVD RO Reserved. Read only, returns 0 when read. Used. The bits in this field indicate whether downstream ports 3 through 0 are enabled or disabled for use. A value of 0 indicates the port is not used. A value of 1 indicates the port is used. Each bit corresponds directly to a downstream port, i.e. used0 corresponds to downstream port 0. For the TUSB8040PFP: The default value for these bits are loaded at the de-assertion of reset with the value of Four-port hub - used[3:0] defaults to 1111b. 3:0 used3:0] RW For the TUSB8040RKM: The default value for these bits are loaded at the de-assertion of reset with the value of LEDG[3:0]z_USED[3:0]: Four-port hub - used[3:0] defaults to wxyzb, where w is LEDG3z_USED3, x is LEDG2z_USED2, y is LEDG1z_USED1 and z is LEDG0z_USED0. When in I2C/SMBus mode the bits in this field corresponding to the enabled ports per used[3:0] may be over-written by EEPROM contents or by an SMBus host. Copyright © 2010–2011, Texas Instruments Incorporated FUNCTIONAL DESCRIPTION 21 Submit Documentation Feedback Product Folder Link(s): TUSB8040 |
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