USB Hub with Integrated 10/100 Ethernet Controller
Datasheet
Table 3.9 Boost_4:2 Register (BOOST42) Format
BITS |
| DESCRIPTION | DEFAULT |
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7:6 | Upstream USB Electrical Signaling Drive Strength Boost Bit for | 00b | |
| Downstream Port 4 (BOOST_IOUT_4) |
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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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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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3:2 | Upstream USB Electrical Signaling Drive Strength Boost Bit for | 00b | |
| Downstream Port 2 (BOOST_IOUT_2) |
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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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1:0 | RESERVED | 00b | |
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Table 3.10 Status/Command Register (STCD) Format
BITS |
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| DESCRIPTION | DEFAULT |
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7:2 | RESERVED | 000000b | ||
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1 | Reset (RESET) | 0b | ||
| Resets the internal memory back to nRESET assertion default settings. |
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| 0 | = Normal Run/Idle State |
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| 1 | = Force a reset of the registers to their default state |
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| Note: | During this reset, this bit is automatically cleared to its default value |
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| of 0. |
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0 | USB Attach and Write Protect (USB_ATTACH) | 1b | ||
| 0 | = Device is in configuration state |
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| 1 | = Hub will signal a USB attach event to an upstream device, and the |
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| internal memory (address range 00h - FEh) is |
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| unintentional data corruption. |
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| Note: | This bit is write once and is only cleared by assertion of the external |
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| nRESET or POR. |
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Revision 1.0 | 32 | SMSC LAN9514 |
| DATASHEET |
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