USB 2.0
Datasheet
4.2.1.16Register 0Fh: Hub Controller Max Current For Bus Powered Operation
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NUMBER | BIT NAME | DESCRIPTION |
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7:0 | HC_MAX_C_BP | Hub Controller Max Current |
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| Hub consumes from an upstream port (VBUS) when operating as a bus- |
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| powered hub. This value will include the hub silicon along with the combined |
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| power consumption (from VBUS) of all associated circuitry on the board. |
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| This value will NOT include the power consumption of a permanently |
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| attached peripheral if the hub is configured as a compound device. |
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| A value of 50 (decimal) would indicate 100mA, which is the default value. |
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4.2.1.17Register 10h: Power-On Time
BIT |
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NUMBER | BIT NAME | DESCRIPTION |
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7:0 | POWER_ON_TIME | Power On Time: The length of time that it takes (in 2 ms intervals) from the |
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| time the host initiated |
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| good on that port. |
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4.2.1.18Register F6h: Boost_Up
BIT |
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NUMBER | BIT NAME | DESCRIPTION |
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7:2 | Reserved | Reserved |
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1:0 | BOOST_IOUT | USB electrical signaling drive strength Boost Bit for the Upstream Port. |
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| ‘00’ = Normal electrical drive strength = No boost |
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| ‘01’ = Elevated electrical drive strength = Low (approximately 4% boost) |
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| ‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost) |
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| ‘11’ = Elevated electrical drive strength = High (approximately 12% boost) |
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| Note: “Boost” could result in |
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| example would be Test J/K levels), the OEM should use a 00 value |
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| unless specific implementation issues require additional signal |
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| boosting to correct for degraded USB signalling levels. |
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4.2.1.19Register F8h: Boost_2:0
BIT |
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NUMBER | BIT NAME | DESCRIPTION |
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7:4 | Reserved | Reserved |
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SMSC USB2512A | 21 | Revision 1.96 |
| DATASHEET |
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