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USB2642 数据表(PDF) 33 Page - Microchip Technology |
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USB2642 数据表(HTML) 33 Page - Microchip Technology |
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33 / 56 page  2014-2015 Microchip Technology Inc. DS00001578C-page 33 USB2642 7.4.3.22 ECh: Hub Controller Max Current For Self-Powered Operation 7.4.3.23 EDh: Hub Controller Max Current For Bus-Powered Operation 7.4.3.24 EEh: Power-On Time 7.4.3.25 EFh: Boost_Up Bit Name Description 7:0 HC_MAX_C_SP Value in 2 mA 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 (References) does not permit this value to exceed 100 mA. A value of 50 (decimal) indicates 100 mA, which is the default value. Bit Name Description 7:0 HC_MAX_C_BP Value in 2 mA increments that the hub consumes from an upstream port (VBUS) when operating as a bus-powered hub. This value will include the hub silicon along with the combined power consumption (from VBUS) of all associated circuitry on the board. This value will NOT include the power consumption of a permanently attached peripheral if the hub is configured as a compound device. A value of 50 (decimal) would indicate 100 mA, which is the default value. Bit Name Description 7:0 POWER_ON_TIME The length of time that it takes (in 2 ms intervals) from the time the host initiated power-on sequence begins on a port until power is adequate on that port. If the host requests the power-on time, the system software uses this value to determine how long to wait before accessing a powered-on port. Bit Name Description 7:2 rsvd 1:0 BOOST_IOUT USB electrical signaling drive strength boost bit for the upstream port ‘A’. 00 : normal electrical drive strength = no boost 01 : elevated electrical drive strength = low (approximately 4% boost) 10 : elevated electrical drive strength = medium (approximately 8% boost) 11 : elevated electrical drive strength = high (approximately 12% boost) Note: “Boost” could result in non-USB Compliant parameters. OEM should use a 00 value unless specific implementation issues require additional signal boosting to correct for degraded USB signaling levels. |
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