EP80579 Datasheet, PDF (1709/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
43.0 Global Design for Test Features
43.1
JTAG
43.1.1
JTAG Functions Overview
The JTAG functionality, has the following attributes.
• The JTAG TAP controller is compliant with the IEEE 1149.1 Specification.
• The JTAG block supports the TAP controllers in IA-32 core and IMCH.
• The JTAG block supports the IO Boundary Scan Requirement implementing all the
mandatory and some optional instructions from the IEEE 1149.1 specification.
43.1.2
43.1.2.1
43.1.2.2
EP80579 TAP Controllers
The JTAG Test Access Port (TAP) controller requires 4 input pins: Test Reset (TRST#,
active Low), Test Clock (TCK), Test Mode Select (TMS) and the serial Test Data In
(TDI). TMS controls tSoChe TAP state transitions. The TAP has one output pin, the
serial Test Data Out (TDO).
IA-32 Core
There are two JTAG Test Access Port (TAP) controllers: one in the IA-32 core, and one
“master” TAP in the MCH. The IA-32 Core TAP is present as a result of the SoC
integration and performs no JTAG functions besides BYPASS and IDCODE.
MCH TAP Extension
The TAP controller in the IMCH (in the CMI), is the master. It executes all of the IEEE
1149/1 compliant JTAG and Boundary Scan functions in the EP80579.
Serial TAPs have the issue that they have a BYPASS register length >1. This is not
desirable from a IEEE 1149.1 compliance standpoint. To get around this, two BSDLs are
published, one each for the IMCH and IA-32 core. The IMCH TAP acts as the master
TAP, supporting the public instructions for customer usage. The IA-32 core TAP’s public
Boundary Scan instructions, while still supported and available, do not perform any
meaningful function since the IA-32 core’s TAP does not control any IO pins directly.
The appropriate Boundary Scan functionality is performed by the corresponding
instructions in the IMCH TAP controller. Both TAPs support the BYPASS and IDCODE
instructions. This is summarized in Table 43-1.
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
1709