28478G-18 Mindspeed Technologies, 28478G-18 Datasheet - Page 193

• Manufacturer Part Number: 28478G-18
• Description: Multichannel Synchronous Communications Controller 208-Pin BGA
• Manufacturer: Mindspeed Technologies

Specifications of 28478G-18

• Package: 208BGA
• Maximum Data Rate: 32768 Kbps
• Transmission Media Type: Wire
• Power Supply Type: Analog
• Typical Supply Current: 250 mA
• Typical Operating Supply Voltage: 3.3 V
• Minimum Operating Supply Voltage: 3 V
• Maximum Operating Supply Voltage: 3.6 V

The CN8478 supports boundary scan testing conforming to IEEE standard 1149.1a-1993 and supplement
1149.1b. 1994. This appendix is intended to assist the customer in developing boundary scan tests for printed
circuit boards and systems that use the CN8478. It is assumed that the reader is familiar with boundary scan
terminology. For the latest version of the Boundary Scan Description Language (BSDL) file, contact Technical
Publications.
The JTAG Interface section of the CN8478 provides access to all external I/O signals of the device for board and
system level testing. This circuitry also conforms to IEEE std. 1149.1a-1993.
A.1
The Instruction register (IR) is a 3-bit register. When the boundary scan circuitry is reset, the IR is loaded with the
BYPASS Instruction. The Capture-IR binary value is 001.
The eight instructions include three IEEE 1149.1 mandatory public instructions (BYPASS, EXTEST, and SAMPLE/
PRELOAD) and five private instructions for manufacturing use only. Bit 0 (LSB) is shifted into instruction register
first.
Table A-1.
28478-DSH-002-E
Bit 2
0
0
0
0
1
1
1
1
IEEE Std. 1149.1 Instructions
Instruction Register
Bit 1
0
0
1
1
0
0
1
1
Preliminary Information / Mindspeed Proprietary and Confidential
Appendix A: JTAG Interface
Mindspeed Technologies
Bit 0
0
1
0
1
0
1
0
1
SAMPLE/PRELOAD
Instruction
BYPASS
EXTEST
Private
Private
Private
Private
Private
®
Register Accessed
Boundary Scan
Boundary Scan
Bypass
—
—
—
—
—
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