at94k05al-25aqi ATMEL Corporation, at94k05al-25aqi Datasheet - Page 75
at94k05al-25aqi
Manufacturer Part Number
at94k05al-25aqi
Description
5k - 40k Gates Of At40k Fpga With 8-bit Microcontroller, Up To 36k Bytes Of Sram And On-chip Jtag Ice
Manufacturer
ATMEL Corporation
Datasheet
1.AT94K05AL-25AQI.pdf
(192 pages)
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AVR Reset
Register
Boundary-scan Chain
Boundary-scan
Specific
JTAG Instructions
Rev. 1138F–FPSLI–06/02
Part Number
The part number is a 16 bit code identifying the component. The JTAG Part Number for AVR
devices is listed in Table 18.
Table 18. JTAG Part Number
Manufacturer ID
The manufacturer ID for ATMEL is 0x01F (11 bits).
The AVR Reset Register is a Test Data Register used to reset the AVR. A high value in the
Reset Register corresponds to pulling the external AVRResetn Low. The AVR is reset as long
as there is a high value present in the AVR Reset Register. Depending on the Bit settings for
the clock options, the CPU will remain reset for a Reset Time-Out Period after releasing the
AVR Reset Register. The output from this Data Register is not latched, so the reset will take
place immediately, see Figure 42.
Figure 42. Reset Register
The Boundary-scan Chain has the capability of driving and observing the logic levels on the
AVR’s digital I/O pins.
See “Boundary-scan Chain” on page 76 for a complete description.
The instruction register is 4-bit wide, supporting up to 16 instructions. Listed below are the
JTAG instructions useful for Boundary-Scan operation. Note that the optional HIGHZ instruc-
tion is not implemented.
As a definition in this data sheet, the LSB is shifted in and out first for all shift registers.
The OPCODE for each instruction is shown behind the instruction name in hex format. The
text describes which data register is selected as path between TDI and TDO for each
instruction.
Device
AT94K05
AT94K10
AT94K40
From other internal and
external reset sources
ClockDR · AVR_RESET
From
TDI
0xdd77
0xdd73
0xdd76
Part Number (Hex)
D
Q
TDO
To
AT94K Series FPSLIC
Internal AVR Reset
75
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