CS61880-IQZ Cirrus Logic Inc, CS61880-IQZ Datasheet - Page 46

• Manufacturer Part Number: CS61880-IQZ
• Description: IC Octal E1 Line Interface Unit
• Manufacturer: Cirrus Logic Inc

16.1.14 Exit1-IR
This is a temporary state. The test data register se-
lected by the current instruction retains its previous
value.
16.1.15 Pause-IR
The pause state allows the test controller to tempo-
rarily halt the shifting of data through the instruc-
tion register.
16.1.16 Exit2-IR
This is a temporary state. The test data register se-
lected by the current instruction retains its previous
value.
16.1.17 Update-IR
The instruction shifted into the instruction register
is latched into the parallel output from the shift-reg-
ister path on the falling edge of TCK. When the
new instruction has been latched, it becomes the
current instruction. The test data registers selected
by the current instruction retain their previous val-
ue.
16.2 Instruction Register (IR)
The 3-bit Instruction register selects the test to be
performed and/or the data register to be accessed.
The valid instructions are shifted in LSB first and
are listed in
46
Table
13:
16.2.1 EXTEST
The EXTEST instruction allows testing of off-chip
circuitry and board-level interconnect. EXTEST
connects the BSR to the TDI and TDO pins.
16.2.2 SAMPLE/PRELOAD
The SAMPLE/PRELOAD instruction samples all
device inputs and outputs. This instruction places
the BSR between the TDI and TDO pins. The BSR
is loaded with samples of the I/O pins by the Cap-
ture-DR state.
16.2.3 IDCODE
The IDCODE instruction connects the device iden-
tification register to the TDO pin. The device iden-
tification code can then be shifted out TDO using
the Shift-DR state.
16.2.4 BYPASS
The BYPASS instruction connects a one TCK de-
lay register between TDI and TDO. The instruction
is used to bypass the device.
IR CODE
000
100
110
111
Table 13. JTAG Instructions
EXTEST
SAMPLE/PRELOAD
IDCODE
BYPASS
INSTRUCTION
CS61880
DS450PP3