Rainbow Electronics MAX16068 - Manual (Page 33)

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MAX16068
6-Channel, Flash-Configurable System Manager
with Nonvolatile Fault Registers
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 21 shows the instructions
supported by the MAX16068 and the respective opera-
tional binary codes.
BYPASS: When the BYPASS instruction is latched into
the instruction register, TDI connects to TDO through the
1-bit bypass test data register. This allows data to pass
from TDI to TDO without affecting the device’s operation.
IDCODE: When the IDCODE instruction is latched into
the parallel instruction register, the identification data
register is selected. The device identification code is
loaded into the identification data register on the rising
edge of TCK following entry into the capture-DR state.
Shift-DR can be used to shift the identification code
out serially through TDO. During test-logic-reset, the
IDCODE instruction is forced into the instruction register.
The identification code always has a ‘1’ in the LSB posi-
tion. The next 11 bits identify the manufacturer’s JEDEC
number and number of continuation bytes followed by
16 bits for the device and 4 bits for the version. See
Table 22.
Table 21. JTAG Instruction Set
Table 22. 32-Bit Identification Code
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)
MSB LSB
VERSION (4 BITS) PART NUMBER (16 BITS) MANUFACTURER (11 BITS) FIXED VALUE (1 BIT)
0001 1000000000000010 00011001011 1