Техническая Спецификация для Intel C2518 FH8065501516710

Intel

Модели

FH8065501516710

Volume 2—Universal Serial Bus (USB) 2.0—C2000 Product Family

USB 2.0 Based Debug Port

Intel

®

Atom™ Processor C2000 Product Family for Microserver

Datasheet, Vol. 2 of 3

September 2014

282

Order Number: 330061-002US

14.12.1.3.4 Debug Software Startup with Initialized EHCI

The debug software attempts to use the debug port if the Current Connect Status bit in

the appropriate (see Determining the Debug Port) PORTSC register is set. If the

Current Connect Status bit is not set, then the debug software chooses to terminate or

chooses to wait until a device is connected.

If a device is connected, then the debug software must set the OWNER_CNT bit and

then the ENABLED_CNT bit in the Debug Port Control/Status register (DP_CTRLSTS).

14.12.1.3.5 Determining Debug Peripheral Presence

After enabling the debug port functionality, the debug software determines if a debug

peripheral is attached by attempting to send data to the debug peripheral. If all

attempts result in an error (exception bits in the Debug Port Control/Status register

(DP_CTRLSTS) indicates a transaction error), then the attached device is not a debug

peripheral. If the debug port peripheral is not present, then the debug software

chooses to terminate or chooses to wait until a debug peripheral is connected.