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

 

 

 

 

 

SUSP_IND/

28

39

I/O

Active/Suspend status LED or Local-Power & Non

LOCAL_PWR/

 

 

 

Removable Strap Option

NON_REM0

 

 

 

Suspend Indicator: Indicates USB state of the hub.

 

 

 

 

 

 

 

 

‘negated’ = Unconfigured, or configured and in USB

 

 

 

 

Suspend

 

 

 

 

‘asserted’ = Hub is configured, and is active (i.e., not in

 

 

 

 

suspend)

 

 

 

 

 

 

 

 

 

Local Power: Detects availability of local self-power

 

 

 

 

source.

 

 

 

 

Low = Self/local power source is NOT available (i.e.,

 

 

 

 

Hub gets all power from Upstream USB VBus).

 

 

 

 

High = Self/local power source is available.

 

 

 

 

NON_REM0 Strap Option:

 

 

 

 

If this strap is enabled by package and configuration

 

 

 

 

settings (see Table 3.2), this pin will be sampled (in

 

 

 

 

conjunction with NON_REM1) at RESET_N negation to

 

 

 

 

determine if ports [4:1] contain permanently attached

 

 

 

 

(non-removable) devices. Also, the active state of the

 

 

 

 

LED will be determined as follows:

 

 

 

 

NON_REM[1:0] = ‘00’, All ports are removable, and the

 

 

 

 

LED is active high

 

 

 

 

NON_REM[1:0] = ‘01’, Port 1 is nonremovable, and the

 

 

 

 

LED is active low

 

 

 

 

NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable,

 

 

 

 

and the LED is active high

 

 

 

 

NON_REM[1:0] = ‘11’, Ports 1, 2 & 3 are non-

 

 

 

 

removable, and the LED is active low

 

 

 

 

 

TEST

11

14

IPD

TEST pin

 

 

 

 

XNOR continuity tests all signal pins on the hub, please

 

 

 

 

contact your SMSC representative for a detailed

 

 

 

 

description of how this test mode is enabled and utilized.

 

 

 

 

 

SEL48

n/a

40

I

Select 48 MHz clock input

 

 

 

 

48MHz external clock input select. When the hub is

 

 

 

 

clocked from an external clock source, this pin selects

 

 

 

 

either 24MHz or 48MHz mode.

 

 

 

 

‘0’ = 24MHz

 

 

 

 

‘1’ = 48MHz

 

 

 

 

 

REG_EN

n/a

11

IPU

Regulator Enable

 

 

 

 

REG_EN: This pin is internally pulled up to enable the

 

 

 

 

internal 1.8V regulators, and this pin should be treated

 

 

 

 

as a no-connect.

 

 

 

 

In order to disable the regulators, this pin will need to be

 

 

 

 

externally connected to ground.

 

 

 

 

When the internal regulator is enabled, the 1.8V power

 

 

 

 

pins must be left unconnected, except for the required

 

 

 

 

bypass capacitors.

 

 

 

 

 

Revision 1.98 (11-19-07)

14

SMSC USB2514

 

DATASHEET