HC4GX15 Datasheet, PDF (147/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 10: IEEE 1149.1 (JTAG) Boundary Scan Testing in HardCopy IV Devices
10–3
Boundary-Scan Register
You can use the USERCODE instruction to shift out a 32-bit user code, which can also
be used to uniquely identify the device. Unlike Stratix IV devices, the user code in
HardCopy IV devices is mask programmed and cannot be changed after the silicon is
fabricated. If the designer does not select a user code, the user code will be mask
programmed to default values. When the USERCODE instruction is issued, the 32-bit
user code is loaded into the same 32-bit device identification register used for the
IDCODE instruction. The user code can then be serially shifted out.
Boundary-Scan Register
The boundary-scan register length for HardCopy IV devices differs from Stratix IV
devices. The length also varies for each HardCopy IV device depending on device
density and available I/O pin count. Table 10–3 lists the boundary-scan register
length for HardCopy IV devices.
Table 10–3. HardCopy IV Boundary-Scan Register Length
Device
HC4GX15
HC4GX25
HC4GX35
HC4E25
HC4E35
Boundary-Scan Register Length
1146
1722
2262
1524
2670
Boundary-Scan Description Language (BSDL) Support
The boundary-scan description language (BSDL), a subset of VHDL, provides a
syntax that allows you to describe the features of an IEEE Std. 1149.1 BST-capable
device that can be tested.
1 There are two versions of the BSDL Customizer tool that you can use. The
pre-configuration version generates a customized BSDL file for use before the device
enters user mode, and the post-configuration version generates a customized BSDL
file for use after the device enters user mode.
f For more information about BSDL files for IEEE Std. 1149.1-compliant HardCopy IV
devices, visit the Altera website at www.altera.com.
f
BSDL files for IEEE Std. 1149.1-compliant HardCopy IV devices can also be generated
using the Quartus software version 8.1 or later. Visit the Altera website at
www.altera.com for the procedure to generate the BSDL files using the Quartus II
software.
f For JTAG timing parameters and values, refer to the DC and Switching Characteristics of
HardCopy IV Devices chapter in volume 4 of the HardCopy IV Device Handbook.
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 1