tmp19a61f10xbg TOSHIBA Semiconductor CORPORATION, tmp19a61f10xbg Datasheet - Page 502

• Manufacturer Part Number: tmp19a61f10xbg
• Description: 32-bit Tx System Risc Tx19 Family
• Manufacturer: TOSHIBA Semiconductor CORPORATION

21.4.2 SAMPLE/PRELOAD Instructions
When using the SAMPLE instruction, complete the instruction update during the system
reset. After the reset is released, do not switch the TAP instruction.
The SAMPLE and PRELOAD instructions are used to connect TDI and TDO by way of the
boundary scan register. This instruction has two functions.
•
•
Input
Input
TDI
TDI
The SAMPLE instruction is used to monitor the I/O pad of an IC. While SAMPLE is
monitoring the I/O pads, the internal logic is not disconnected from the I/O pins of an IC.
This instruction is executed in the Capture-DR state. A main function of SAMPLE is to read
values of the I/O pins of an IC at the rising edge of TCK during normal functional operation.
Fig. 21-9 shows the flow of data while the SAMPLE instruction is selected.
The PRELOAD instruction is used to initialize the boundary scan register before selecting
other instructions. For example, the boundary scan register is initialized using PRELOAD
before selecting the EXTEST instruction, as previously explained. PRELOAD shifts data
into the boundary scan register without affecting the normal operation of the system logic.
Fig. 21.10 shows the flow of data while the PRELOAD instruction is selected.
Fig. 21.10 Flow of Test Data While PRELOAD Is Selected
Fig. 21.9 Flow of Data While SAMPLE Is Selected
TMP19A61 (rev1.0)21 -501
Boundary scan path
Boundary scan path
Internal logic
Internal logic
TMP19A61
Output
Output
TDO
TDO