HC4GX15 Datasheet, PDF (146/668 Pages) Altera Corporation – HardCopy IV Device Handbook

10–2
Chapter 10: IEEE 1149.1 (JTAG) Boundary Scan Testing in HardCopy IV Devices
JTAG Instructions
Table 10–1. HardCopy IV JTAG Instructions (Part 2 of 2)
JTAG Instruction
Instruction Code
Description
IDCODE
00 0000 0110
Loads the 32-bit ID code into the device identification register and
places the register between the TDI and TDO pins, allowing the ID
code to be serially shifted out of TDO.
HIGHZ (1)
00 0000 1011
Places the 1-bit bypass register between the TDI and TDO pins,
which allows the BST data to pass synchronously through selected
devices to adjacent devices during normal device operation while
tri-stating all of the I/O pins.
CLAMP (1)
00 0000 1010
Places the 1-bit bypass register between the TDI and TDO pins,
which allows the BST data to pass synchronously through selected
devices to adjacent devices during normal device operation while
holding I/O pins to a state defined by the data in the boundary-scan
register.
Note to Table 10–1:
(1) Bus hold and weak pull-up resistor features override the high-impedance state of HIGHZ, CLAMP, and EXTEST.
1 Similar to Stratix IV devices, HardCopy IV devices support the SignalTap^® II
Embedded Logic Analyzer, which monitors design operation over a period of time
through the JTAG interface. The SignalTap II Embedded Logic Analyzer is a useful
feature during the device prototyping phase, but should be removed if not required,
after you map the design to a HardCopy IV device. HardCopy IV devices are mask
programmed, and the SignalTap II logic cannot be removed after the HardCopy IV
device is fabricated.
IDCODE and USERCODE
The IDCODE instruction gives you the ability to shift out a 32-bit identification (ID)
code from HardCopy IV devices. ID codes are different in Stratix IV devices and
unique for each HardCopy IV device. The ID code can be used to determine the
correct device during BST. When the IDCODE instruction is issued, the ID code is
loaded into a 32-bit device identification register for shifting out. Table 10–2 shows the
ID codes for the HardCopy IV devices.
Table 10–2. 32-Bit HardCopy IV Device IDCODE (Note 1), (2)
IDCODE (32 Bits)
Device Version (4 Bits)
HC4GX15
0000
HC4GX25
0000
HC4GX35
0000
HC4E25
0000
HC4E35
0000
Notes to Table 10–2:
(1) The MSB is on the left.
(2) The LSB of IDCODE is always 1.
Part Number (16 Bits)
0010 0011 0001 0101
0010 0011 0010 0101
0010 0011 0011 0101
0010 0110 0010 0101
0010 0110 0011 0101
Manufacturer Identity (11 Bits)
000 0110 1110
000 0110 1110
000 0110 1110
000 0110 1110
000 0110 1110
LSB (1 Bit)
1
1
1
1
1
HardCopy IV Device Handbook, Volume 1
© June 2009 Altera Corporation