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USB 2.0 High-Speed 4-Port Hub Controller
Datasheet
SMSC USB2514 11 Revision 1.98 (11-19-07)
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" 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
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