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USB2524 数据表(PDF) 23 Page - Microchip Technology |
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USB2524 数据表(HTML) 23 Page - Microchip Technology |
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23 / 58 page  2013 - 2016 Microchip Technology Inc. DS00001588B-page 23 USB2524 7.1.4.12 Register 0Bh: Port Disable For Bus Powered Operation (Reset = 0x00) 7.1.4.13 Register 0Ch: Max Power For Self Powered Operation (Reset = 0x00) 7.1.4.14 Register 0Dh: Max Power For Bus Powered Operation (Reset = 0x00) 7.1.4.15 Register 0Eh: Hub Controller Max Current For Self Powered Operation (Reset = 0x00) Bit Number Bit Name Description 7:0 PORT_DIS_BP Port Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port is available, ‘1’ = port is disabled. During Bus-Powered operation, this selects the ports which will be permanently disabled, and are not available to be enabled or enumerated by a Host Controller. The disabled ports must be contiguous, and must be in decreasing order starting with port 4. When using the internal default option, the PRT_DIS[1:0] pins will disable the appropriate ports. Bit 7= Reserved, always = ‘0’. Bit 6= Reserved, always = ‘0’. Bit 5= Reserved, always = ‘0’. Bit 4= 1; Port 4 is disabled. Bit 3= 1; Port 3 is disabled. Bit 2= 1; Port 2 is disabled. Bit 1= 1; Port 1 is disabled. Bit 0 is Reserved, always = ‘0’ Bit Number Bit Name Description 7:0 MAX_PWR_SP Max Power Self_Powered: Value in 2mA increments that the Hub consumes from an upstream port (VBUS) when operating as a self-powered hub. This value includes the hub silicon along with the combined power consumption (from VBUS) of all associated circuitry on the board. This value also includes the power consumption of a permanently attached peripheral if the hub is configured as a compound device, and the embedded peripheral reports 0mA in its descriptors. Note: The USB 2.0 Specification does not permit this value to exceed 100mA Bit Number Bit Name Description 7:0 MAX_PWR_BP Max Power Bus_Powered: Value in 2mA increments that the Hub consumes from an upstream port (VBUS) when operating as a bus-powered hub. This value includes the hub silicon along with the combined power consumption (from VBUS) of all associated circuitry on the board. This value also includes the power consumption of a permanently attached peripheral if the hub is configured as a compound device, and the embedded peripheral reports 0mA in its descriptors. Bit Number Bit Name Description 7:0 HC_MAX_C_SP Hub Controller Max Current Self-Powered: Value in 2mA increments that the Hub consumes from an upstream port (VBUS) when operating as a self- powered hub. This value includes the hub silicon along with the combined power consumption (from VBUS) of all associated circuitry on the board. This value does NOT include the power consumption of a permanently attached peripheral if the hub is configured as a compound device. Note: The USB 2.0 Specification does not permit this value to exceed 100mA |
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