USB2517 datasheet(26/72 Pages) SMSC

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USB 2.0 Hi-Speed Hub Controller

Datasheet

Revision 1.0 (3-11-09)

SMSC USB251x

DATASHEET

MISC

XTALIN

ICLKx

Crystal Input

24 MHz crystal

This pin connects to either one terminal of the crystal or to an external

24 MHz clock when a crystal is not used.

CLKIN

External Clock Input

This pin connects to either one terminal of the crystal or to an external

24 MHz clock when a crystal is not used.

XTALOUT

OCLKx

Crystal Output

24 MHz Crystal

This is the other terminal of the crystal, or a no connect pin, when an external

clock source is used to drive XTALIN/CLKIN.

SUSP_IND /

LOCAL_PWR /

NON_REM[0]

I/O

Active/Suspend status LED

Suspend Indicator: Indicates USB state of the hub.

‘negated’ = Unconfigured, or configured and in USB Suspend

‘asserted’ = the 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., the hub gets all power

from Upstream USB VBus).

High = Self/local power source is available.

NON_REM[0] Strap Option:

If this strap is enabled by package and configuration settings (see Table 8.1,

"Hub Configuration Options"), this pin will be sampled (in conjunction with

NON_REM[1]) at RESET_N negation to determine if ports [x: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 non-removable, 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’, When available, ports 1, 2 & 3 are non-removable, and

the LED is active low

TEST

IPD

TEST pin

User must treat as a no connect pin or connect to ground. No trace or signal

should be routed or attached to this pin.

Table 5.2 USB251x Pin Descriptions (continued)

SYMBOL

BUFFER

TYPE

DESCRIPTION

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