tmp19a61f10xbg TOSHIBA Semiconductor CORPORATION, tmp19a61f10xbg Datasheet - Page 490
tmp19a61f10xbg
Manufacturer Part Number
tmp19a61f10xbg
Description
32-bit Tx System Risc Tx19 Family
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP19A61F10XBG.pdf
(575 pages)
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21. JTAG Interface
21.1 Boundary Scan Overview
(Note)
not implemented in the TMP19A61.
The TMP19A61 is equipped with the boundary scan interface that conforms to the Joint Test Action
Group (JTAG) standard. This interface uses the industry-standard JTAG protocol (IEEE Standard
1149.1/D6). This chapter describes this JTAG interface with a mention of boundary scan, interface
pins, interface signals, and test access ports (TAP).
IC (Integrated Circuit) density is ever increasing, SMDs (Surface Mount Devices) continue to
decrease in size, components are now mounted on both sides of printed circuit boards (PCBs), and
there are considerable technical developments related to embedding holes. Conventional internal
circuit testing techniques are dependent on the physical contact between internal circuitry and chips
and, therefore, their limitations with respect to efficiency and accuracy are manifest. With the
ever-increasing IC complexity, tests conducted to perform inspections on all chips integrated into an
IC are becoming larger in scale, and it is becoming more difficult to design an efficient, reliable IC
testing program.
To overcome this difficulty in performing IC tests, the "boundary scan" circuit was developed. It is a
group of shift registers called "boundary scan cells" established between pins and internal circuitry
(see Fig. 21.1). These boundary scan cells are bypassed under normal conditions. When an IC goes
into test mode, data is sent from the boundary scan cells through the shift register bus in response to
the instruction given by a test program, and various diagnostic tests are executed. In IC tests, five
signals TDI, TDO, TMS, TCK and TRST are used. These signals are explained in the next section.
The optional instructions IDCODE, USERCODE, INTEST and RUNBIST are
Fig. 21.1 JTAG Boundary Scan Cells
TMP19A61 (rev1.0)21 -489
Integrated circuit
Pins on IC package
Boundary scan cell
TMP19A61
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