MAX16067 Datasheet, PDF (39/47 Pages) Maxim Integrated Products – 6-Channel, Flash-Configurable System Manager with Nonvolatile Fault Registers

6-Channel, Flash-Configurable System Manager
with Nonvolatile Fault Registers
Update-DR: A falling edge on TCK while in the update-
DR state latches the data from the shift register path of
the test data registers into a set of output latches. This
prevents changes at the parallel output because of
changes in the shift register. On the rising edge of TCK,
the controller goes to the run-test/idle state if TMS is low
or goes to the select-DR-scan state if TMS is high.
Select-IR-Scan: All test data registers retain the previ-
ous states. The instruction register remains unchanged
during this state. With TMS low, a rising edge on TCK
moves the controller into the capture-IR state. TMS high
during a rising edge on TCK puts the controller back into
the test-logic-reset state.
Capture-IR: Use the capture-IR state to load the shift
register in the instruction register with a fixed value.
This value is loaded on the rising edge of TCK. If TMS is
high on the rising edge of TCK, the controller enters the
exit1-IR state. If TMS is low on the rising edge of TCK,
the controller enters the shift-IR state.
Shift-IR: In this state, the shift register in the instruction
register connects between TDI and TDO and shifts data
one stage for every rising edge of TCK toward the TDO
serial output while TMS is low. The parallel outputs of
the instruction register as well as all test data registers
remain at the previous states. A rising edge on TCK with
TMS high moves the controller to the exit1-IR state. A
rising edge on TCK with TMS low keeps the controller in
the shift-IR state while moving data one stage through
the instruction shift register.
Exit1-IR: A rising edge on TCK with TMS low puts the
controller in the pause-IR state. If TMS is high on the ris-
ing edge of TCK, the controller enters the update-IR state.
Pause-IR: Shifting of the instruction shift register halts
temporarily. With TMS high, a rising edge on TCK puts
the controller in the exit2-IR state. The controller remains
in the pause-IR state if TMS is low during a rising edge
on TCK.
Exit2-IR: A rising edge on TCK with TMS high puts the
controller in the update-IR state. The controller loops
back to shift-IR if TMS is low during a rising edge of TCK
in this state.
Update-IR: The instruction code that has been shifted
into the instruction shift register latches to the parallel
outputs of the instruction register on the falling edge of
TCK as the controller enters this state. Once latched,
this instruction becomes the current instruction. A rising
edge on TCK with TMS low puts the controller in the run-
test/idle state. With TMS high, the controller enters the
select-DR-scan state.
Instruction Register
The instruction register contains a shift register as well
as a latched 5-bit wide parallel output. When the TAP
controller enters the shift-IR state, the instruction shift
register connects between TDI and TDO. While in the
shift-IR state, a rising edge on TCK with TMS low shifts
the data one stage toward the serial output at TDO. A
rising edge on TCK in the exit1-IR state or the exit2-IR
state with TMS high moves the controller to the update-
IR state. The falling edge of that same TCK latches the
data in the instruction shift register to the instruction
register parallel output. Table 28 shows the instructions
supported by the MAX16067 and the respective opera-
tional binary codes.
Table 28. JTAG Instruction Set
INSTRUCTION
CODE
NOTES
BYPASS
0x1F
Mandatory instruction code
IDCODE
0x00
Load manufacturer ID code/part number
USERCODE
0x03
Load user code
LOAD ADDRESS
0x04
Load address register content
READ DATA
0x05
Read data pointed by current address
WRITE DATA
0x06
Write data pointed by current address
REBOOT
0x07
Reboot FLASH data content into register file
SAVE
0x08
Trigger emergency save to flash
SETFLSHADD
0x09
Flash page access ON
RSTFLSHADD
0x0A
Flash page access OFF
SETUSRFLSH
0x0B
User flash access ON (must be in flash page already)
RSTUSRFLSH
0x0C
User flash access OFF (return to flash page)
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