Datasheet
5.3.9.14Register 0Dh: Max Power For Bus Powered Operation (Reset = 0x00)BIT |
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NUMBER | BIT NAME | DESCRIPTION |
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7:0 | MAX_PWR_BP | Max Power Bus_Powered: Value in 2mA increments that the Hub consumes |
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| from an upstream port (VBUS) when operating as a |
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| value includes the hub silicon along with the combined power consumption |
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| (from VBUS) of all associated circuitry on the board. This value also includes |
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| the power consumption of a permanently attached peripheral if the hub is |
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| configured as a compound device, and the embedded peripheral reports |
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| 0mA in its descriptors. |
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| A value of 50 (decimal) indicates 100mA. |
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5.3.9.15Register 0Eh: Hub Controller Max Current For Self Powered Operation (Reset = 0x00)
BIT |
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NUMBER | BIT NAME | DESCRIPTION |
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7:0 | HC_MAX_C_SP | Hub Controller Max Current |
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| Hub consumes from an upstream port (VBUS) when operating as a self- |
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| powered hub. This value includes 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 does 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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| Note: The USB 2.0 Specification does not permit this value to exceed |
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| 100mA |
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| A value of 50 (decimal) indicates 100mA, which is the default value. |
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5.3.9.16Register 0Fh: Hub Controller Max Current For Bus Powered Operation (Reset = 0x00)
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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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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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The registers shown in Table 5.4 are the defined registers in the Hub. Reads to undefined registers return 00h. Writes to undefined registers have no effect and do not return an error.
SMSC USB2502 | 31 | Revision 2.3 |
| DATASHEET |
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