MMC2107 Datasheet, PDF (542/618 Pages) –

Freescale Semiconductor, Inc.
JTAG Test Access Port and OnCE
Table 21-1. JTAG Instructions
Instruction
IR3–IR0
Instruction Summary
EXTEST
0000
Selects the boundary scan register while
applying fixed values to output pins and
asserting functional reset
IDCODE
0001 Selects IDCODE register for shift
SAMPLE/PRELOAD
0010
Selects the boundary scan register for
shifting, sampling, and preloading without
disturbing functional operation
ENABLE_MCU_ONCE
0011
Instruction to enable the M•CORE TAP
controller
HIGHZ
1001
Selects the bypass register while
three-stating all output pins and asserting
functional reset
CLAMP
1100
Selects bypass while applying fixed values to
output pins and asserting functional reset
BYPASS
1111
Selects the bypass register for data
operations
Reserved
0100
0110
Instruction for chip manufacturing purposes
only
Reserved
0101
Instruction for chip manufacturing purposes
only⁽¹⁾
Reserved
0111–1000
1101–1110 _{Decoded to select bypass register}⁽²⁾
1010–1011
1. To exit this instruction, the TRST pin must be asserted or power-on reset.
2. Motorola reserves the right to change the decoding of the unused opcodes in the future.
21.5.2 IDCODE Instruction
The IDCODE instruction selects the 32-bit IDCODE register for
connection as a shift path between the TDI pin and the TDO pin. This
instruction allows interrogation of the MMC2107 to determine its version
number and other part identification data. The IDCODE register has
been implemented in accordance with the IEEE 1149.1 standard so that
the least significant bit of the shift register stage is set to logic 1 on the
rising edge of TCLK following entry into the capture-DR state. Therefore,
the first bit to be shifted out after selecting the IDCODE register is always
Technical Data
542
JTAG Test Access Port and OnCE
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MMC2107 – Rev. 2.0
MOTOROLA