gwixp465bad ETC-unknow, gwixp465bad Datasheet - Page 37

• Manufacturer Part Number: gwixp465bad
• Description: Network Proc 1.3v/1.4v/2.5v/3.3v 400mhz 544-pin Bga
• Manufacturer: ETC-unknow

Datasheet—Intel
3.2.12
4.0
4.1
4.1.1
August 2006
Document Number:
Debug Unit
The debug unit is accessed through the JTAG port. The industry-standard, IEEE 1149.1
JTAG port consists of a test access port (TAP) controller, boundary-scan register,
instruction and data registers, and dedicated signals TDI, TDO, TCK, TMS, and TRST#.
The debug unit — when used with debugger application code running on a host system
outside of the Intel XScale
XScale
exception to stop program execution and redirect execution to a debug-handling
routine.
Debug exceptions are instruction breakpoint, data breakpoint, software breakpoint,
external debug breakpoint, exception vector trap, and trace buffer full breakpoint. Once
execution has stopped, the debugger application code can examine or modify the Intel
XScale
code can then restart program execution.
The debug unit has two hardware-instruction, break point registers; two hardware,
data-breakpoint registers; and a hardware, data-breakpoint control register. The
second data-breakpoint register can be alternatively used as a mask register for the
first data-breakpoint register.
A 256-entry trace buffer provides the ability to capture control flow messages or
addresses. A JTAG instruction (LDIC) can be used to download a debug handler via the
JTAG port to the mini-instruction cache (the I-cache has a 2-Kbyte, mini-instruction
cache, like the mini-data cache, that is used only to hold a debug handler).
Package Information
This section contains information on the following topics:
Package Description
The IXP45X/IXP46X network processors are built using a 544-ball, plastic ball grid
array (PBGA) package with a drop-in heat spreader (H).
For all extended temperature products and the 667-MHz speed option of the
commercial temperature product, a 10-mm-high, thermal-adhesive-based heat sink
will be required. The heat sink does not force the addition of any surface area to the
board design.
Package Drawings
The package is shown in
®
•
•
•
•
306261-004US
IXP45X and Intel
“Package Description”
and
“Functional Signal Definitions” on page 43
“Signal-Pin Descriptions” on page 77
“Package Thermal Specifications” on page 102
®
®
“Part Numbers”
processor, to be debugged. It allows the debugger application code or a debug
processor’s state, coprocessor state, or memory. The debugger application
®
IXP46X Product Line of Network Processors
Figure 5
®
which includes
processor — allows a program, running on the Intel
Intel
and
®
Figure
IXP45X and Intel
“Package
6.
Drawings”,
®
IXP46X Product Line of Network Processors
“Package
Markings”,
Datasheet
37