USB2513 datasheet(24/72 Pages) SMSC

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USB 2.0 Hi-Speed Hub Controller

Datasheet

Revision 1.0 (3-11-09)

SMSC USB251x

DATASHEET

DOWNSTREAM USB 2.0 INTERFACES (continued)

LED_B_N[2:1] /

BOOST[1:0]

I/O12

Enhanced Indicator Port LED for ports 1 and 2

Enhanced indicator LED for ports 1 and 2. This pin will be active low when

LED support is enabled via EEPROM or SMBus.

If this strap option is enabled by package and configuration settings (see

Table 8.1, "Hub Configuration Options"), 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 Section 8.2.1.27, "Register F6h: Boost_Up," on page 45 and Section

8.2.1.29, "Register F8h: Boost_4:0," on page 47 for more information.

BOOST[1:0] = BOOST_IOUT[1:0]

BOOST[1:0] = ‘00’,

LED_B_N[2] is active high,

LED_B_N[1] is active high.

BOOST[1:0] = ‘01’,

LED_B_N[2] is active high,

LED_B_N[1] is active low.

BOOST[1:0] = ‘10’,

LED_B_N[2] is active low,

LED_B_N[1] is active high.

BOOST[1:0] = ‘11’,

LED_B_N[2] is active low,

LED_B_N[1] is active low.

PRTPWR_POL

IPU

Port Power Polarity Strapping

Port Power Polarity strapping determination for the active signal polarity of

the [x: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 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[x:1] pins.

‘1’ = PRTPWR[x:1]_P/N pins have an active ‘high’ polarity

‘0’ = PRTPWR[x:1]_P/N pins have an active ‘low’ polarity

Warning: Active low port power controllers may glitch the downstream port

power when the system power is first applied. Care should be taken when

designing with active low components.

When PRTPWR_POL is not an available pin on the package, the hub will only

support active high power controllers.

OCS_N[x:1]

IPU

Over-Current Sense

Input from external current monitor indicating an over-current condition.

RBIAS

I-R

USB Transceiver Bias

A 12.0 k

Ω (+/- 1%) resistor is attached from ground to this pin to set the

transceiver’s internal bias settings.

Table 5.2 USB251x Pin Descriptions (continued)

SYMBOL

BUFFER

TYPE

DESCRIPTION

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