USB Hub with Integrated 10/100 Ethernet Controller
Datasheet
Table 3.6 Config Data Byte 3 Register (CFG3) Format
BITS | DESCRIPTION | DEFAULT |
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7:4 | RESERVED | 0h |
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3 | Port | 0b |
| Selects the method used by the Hub to assign port numbers and disable |
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| ports. |
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| 0 = Standard Mode. The following EEPROM addresses are used to define |
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| which ports are enabled. The ports mapped as Port’n’ on the Hub are |
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| reported as Port’n’ to the host, unless one of the ports is disabled, then the |
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| higher numbered ports are remapped in order to report contiguous port |
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| numbers to the host. |
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| EEPROM Address 2Ah: Port Disable for |
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| EEPROM Address 2Bh: Port Disable for |
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| 1 = Port |
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| EEPROM addresses: |
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| EEPROM Address 36h: Port Remap 12 |
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| EEPROM Address 37h: Port Remap 3 |
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2:0 | RESERVED | 000b |
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Table 3.7 Boost_Up Register (BOOSTUP) Format
BITS |
| DESCRIPTION | DEFAULT |
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7:2 | RESERVED | 000000b | |
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1:0 | Upstream USB Electrical Signaling Drive Strength Boost Bit for | 00b | |
| Upstream Port A (BOOST_IOUT_A) |
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| 00 | = Normal electrical drive strength |
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| 01 | = Elevated electrical drive strength (+4% boost) |
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| 10 | = Elevated electrical drive strength (+8% boost) |
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| 11 = Elevated electrical drive strength (+12% boost) |
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Table 3.8 Boost_3:2 Register (BOOST32) Format
BITS |
| DESCRIPTION | DEFAULT |
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7:6 | RESERVED | 00b | |
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5:4 | Upstream USB Electrical Signaling Drive Strength Boost Bit for | 00b | |
| Downstream Port 3 (BOOST_IOUT_3) |
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| 00 | = Normal electrical drive strength |
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| 01 | = Elevated electrical drive strength (+4% boost) |
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| 10 | = Elevated electrical drive strength (+8% boost) |
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| 11 = Elevated electrical drive strength (+12% boost) |
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Revision 1.0 | 30 | SMSC LAN9512 |
| DATASHEET |
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