USB2533 datasheet(39/50 Pages) MICROCHIP

39 / 50 page

USB 2.0 Hi-Speed 3-Port Hub Controller

Datasheet

 2014 Microchip Technology Inc.

DS00001702A-page 39

function as expected per the USB 2.0 Specification with respect to a resume event. It will permit the

host to take over resume signaling.

For the case where the host is not able to drive a ‘K’ within the 14 ms time frame, the hub will stop

sending a ‘K’ on the upstream and downstream ports. It must follow through as a controlling hub and

properly terminate the resume with either an EOP or with HS terminations as is currently implemented

in the selective resume case, per the USB specification.

8.6

High Speed Indicator (HS_IND)

The HS_IND pin can be used to drive an LED. The active state of the LED will be determined as

follows:



If CFG_SEL1 = ‘0’, HS_IND is active high.



If CFG_SEL1 = ‘1’, then HS_IND is active low.

Assertion of HS_IND indicates the device is connected at high speed. Negation of HS_IND indicates

the device is connected at full speed.

Note: This pin shares functionality with the CFG_SEL1 configuration strap. The logic state of this pin

is internally latched on the rising edge of RESET_N (RESET_N negation), and is used to

determine the hub configuration method. Refer to Section 6.3.2, "Configuration Select

(CFG_SEL[1:0])," on page 29 for additional information.

USB2533 数据表(PDF) 39 Page - Microchip Technology