PEB2447 SIEMENS [Siemens Semiconductor Group], PEB2447 Datasheet - Page 18

• Manufacturer Part Number: PEB2447
• Description: Memory Time Switch Extended Large MTSXL
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Semiconductor Group
2.3.2
The TAP controller implements a state machine defined in the JTAG standard
IEEE1149.1. The instruction register of the controller is extended to 4 bits in order to
increase the number of instructions. This is necessary for the use of the build in selftest
procedure via the boundary scan interface:
Table 3
Instruction Code of 4 Bit TAP Controller
Instruction
EXTEST
INTEST
SAMPLE / PRELOAD
IDCODE
BYPASS
TAP_TEST1:
Start built in self test
TAP_TEST2:
Write selftest control register
TAP_TEST3
TAP_TEST4
TAP_TEST5
TAP_TEST6
TAP_TEST7
TAP_TEST8
The standard instructions are implemented according to the JTAG standard, just the
instruction register is extended to 4 bits. At the new instructions TAP_TEST1.. 8 special
internal test signals are activated during the state “RUN TEST / IDLE”.
The MTSXL only uses TAP_TEST1 and TAP_TEST2 according to table 3.
TAP Controller
Code
0000
0001
0010
0011
11xx
0100
0101
0110
0111
1000
1001
1010
1011
18
Functional Description
PEB 2447
03.97