Rev. 2.00, 09/03, page 570 of 690
Bit
Bit
Name
Initial
Value
R/W
Description
15 to 13
TI7 to TI5
1
R
12
TI4
0
R
11 to 8
TI3 to TI0
1
R
Test Instruction 7 to 0
The UDI instruction is transferred to SDIR by a
serial input from TDI.
For commands, see table 23.2.
7 to 2
1
R
Reserved
These bits are always read as 1.
1
0
R
Reserved
This bit is always read as 0.
0
1
R
Reserved
This bit is always read as 1.
Table 23.2
UDI Commands
Bits 15 to 8
TI7
TI6
TI5
TI4
TI3
TI2
TI1
TI0
Description
0
0
0
0
—
—
—
—
JTAG EXTEST
0
0
1
0
—
—
—
—
JTAG CLAMP
0
0
1
1
—
—
—
—
JTAG HIGHZ
0
1
0
0
—
—
—
—
JTAG SAMPLE/PRELOAD
0
1
1
0
—
—
—
—
UDI reset negate
0
1
1
1
—
—
—
—
UDI reset assert
1
0
1
—
—
—
—
—
UDI interrupt
1
1
1
0
—
—
—
—
JTAG IDCODE (Initial value)
1
1
1
1
—
—
—
—
JTAG BYPASS
Other than the above
Reserved
23.3.3
Boundary Scan Register (SDBSR)
SDBSR is a 385-bit shift register, located on the PAD, for controlling the input/output pins of this
LSI. The initial value is undefined. SDBSR cannot be accessed by the CPU.
Using the EXTEST, SAMPLE/PRELOAD, CLAMP, and HIGHZ commands, a boundary scan
test which supports the JTAG standard can be carried out. Table 23.3 shows the correspondence
between this LSI’s pins and boundary scan register bits.
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