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EMC4001 Datasheet(PDF) 11 Page - SMSC Corporation |
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EMC4001 Datasheet(HTML) 11 Page - SMSC Corporation |
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11 / 46 page  USB 2.0 High-Speed 4-Port Hub Controller Datasheet SMSC USB2514 11 Revision 1.92 (05-08-07) DATASHEET BOOST[1:0], If this strap is enabled by package and configuration settings (see Table 3.2), this pin will be sampled at RESET_N negation to determine if all PHY ports (upstream and downstream) operate at a normal or boosted electrical level. Also, the active state of the LEDs will be determined as follows: See for BOOST values: Section 4.3.1.26, "Register F6h: Boost_Up (Reset = 0x00)" and Section 4.3.1.27, "Register F8h: Boost_4:0 (Reset = 0x00)". BOOST[1:0] = BOOST_IOUT[1:0] BOOST[1:0] = ‘00’, LED_B2_N is active high, LED_B1_N is active high. BOOST[1:0] = ‘01’, LED_B2_N is active high, LED_B1_N is active low. BOOST[1:0] = ‘10’, LED_B2_N is active low, LED_B1_N is active high. BOOST[1:0] = ‘11’, LED_B2_N is active low, LED_B1_N is active low. PRTPWR_POL n/a 38 I/O12 Port Power Polarity strapping Port Power Polarity strapping determination for the active signal polarity of the [4:1]PRTPWR pins. While RESET_N is asserted, the logic state of this pin will (through the use of internal combinatorial logic) determine the active state of the [4:1]PRTPWR pins in order to ensure that downstream port power is not inadvertently enabled to inactive ports during a hardware reset. When RESET_N is negated, the logic value will be latched internally, and will retain the active signal polarity for the PRTPWR[4:1] pins. ‘1’ = PRTPWR[4:1]_P/N pins have an active ‘high’ polarity ‘0’ = PRTPWR[4:1]_P/N pins have an active ‘low’ polarity Warning: Active Low port power controllers may glitch the downstream port power when system power is first applied. Care should be taken when designing with active low components! Note: If PRTPWR_POL is not an available pin on the package, the hub will support active high power controllers only! OCS[4:1]_N 21 19 17 13 28 26 20 16 IPU Over Current Sense Input from external current monitor indicating an over- current condition. {Note: Contains internal pull-up to 3.3V supply} Table 3.1 USB2514 Pin Descriptions (continued) SYMBOL 36 QFN 48 QFN BUFFER TYPE DESCRIPTION |
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