MC68EC040RC25A Freescale Semiconductor, MC68EC040RC25A Datasheet - Page 120

• Manufacturer Part Number: MC68EC040RC25A
• Description: IC MPU 32BIT 25MHZ 179-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC040RC25A

• Processor Type: M680x0 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 179-PGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

SECTION 6
IEEE 1149.1A TEST ACCESS PORT (JTAG)
The M68040 includes dedicated user-accessible test logic that is fully compatible with the
IEEE standard 1149.1A Standard Test Access Port and Boundary Scan Architecture .
Problems associated with testing high-density circuit boards have led to the standard’s
development under the sponsorship of the IEEE Test Technology Committee and the
Joint Test Action Group (JTAG).
This section is to be used in conjunction with the supporting IEEE document and includes
those chip-specific items that the IEEE standard requires to be defined and additional
information specific to the M68040 implementation. For example, the IEEE standard
1149.1A test access port (TAP) controller states are referenced in this section but are not
described. For these details and application information regarding the standard, refer to
the IEEE standard 1149.1A document.
The M68040 implementation supports circuit board test strategies based on the standard.
The test logic utilizes static logic design and is system logic independent of the device.
The M68040 implementation provides capabilities to:
MOTOROLA
a. Perform boundary scan operations to test circuit board electrical continuity,
b. Bypass the M68040 by reducing the shift register path to a single cell,
c. Sample the M68040 system pins during operation and transparently shift out the
d. Disable the output drive to output-only pins during circuit board testing, and
e. Select one of two output drivers on a pin-by-pin basis.
result,
This section does not apply to the MC68040V and
MC68EC040V. Refer to Appendix C MC68040V and
MC68EC040 for details. All references to M68040 in this
section only, refer to the MC68040, MC68LC040, and
MC68EC040.
The IEEE standard 1149.1A test logic cannot be considered
completely benign to those planning not to use this capability.
Certain precautions must be observed to ensure that this logic
does not interfere with system operation. Refer to 6.5
Disabling the IEEE Standard 1149.1A Operation.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
M68040 USER’S MANUAL
NOTE
NOTE
6- 1