CX28398 Conexant Systems, CX28398 Datasheet - Page 120

• Manufacturer Part Number: CX28398
• Description: (CX28394 - CX28398) Quad/x16/Octal?T1/E1/J1 Framers
• Manufacturer: Conexant Systems

2.0 Circuit Description
2.8 Joint Test Access Group
2.8.1 Instructions
2-62
2.8 Joint Test Access Group
The device incorporates printed circuit board testability circuits in compliance
with IEEE Std. P1149.1a–1993, IEEE Standard Test Access Port and
Boundary–Scan Architecture, commonly known as JTAG (Joint Test Action
Group).
TAP provides a standard interface through which instructions and test data are
communicated (see
(BSDL) file is available from Conexant upon request.
Figure 2-30. Test Access Port (TAP) Diagram
In addition to the required BYPASS, SAMPLE/PRELOAD, and EXTEST
instructions, IDCODE instruction is supported. There is also one private
instruction.
Table 2-8. JTAG Instructions
(CX28394, CX28398) TDO
The JTAG includes a Test Access Port (TAP) and several data registers. The
The test access port consists of TDI, TCK, TMS, TDO and TRST* pins.
SAMPLE/PRELOAD
Instruction
Table 2-8
BYPASS
EXTEST
IDCODE
Private
TRST*
Conexant
Figure
TMS
TCK
TDI
lists the JTAG instructions along with their codes.
2-30). A Boundary Scan Description Language
JTAG Port
Code
111
001
000
010
xxx
Quad/x16/Octal—T1/E1/J1 Framers
CX28394/28395/28398
TDO1
TDO2
(CX28395)
100054E
100054_003