SMSC USB2514 TYPE, Note:, BUFFER, SYMBOL, 36 QFN, 48 QFN, DESCRIPTION, Table 3.1 USB2514 Pin Descriptions (continued)

USB 2.0 High-Speed 4-Port Hub Controller

Datasheet

Table 3.1 USB2514 Pin Descriptions (continued)

			BUFFER
SYMBOL	36 QFN	48 QFN	TYPE	DESCRIPTION
				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" and Section 4.3.1.27, "Register F8h:
				Boost_4:0".
				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	IPU	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	28	IPU	Over Current Sense
	19	26		Input from external current monitor indicating an over-
	17	20
	13	16		current condition.
				{Note: Contains internal pull-up to 3.3V supply}

SMSC USB2514	11	Revision 1.98 (11-19-07)
	DATASHEET