General Description:
When using JTAG Programmer or JDRIVE, it is sometimes necessary to know the length of a device's Instruction Register. How do I determine the length of the IR?
The easiest way to find the length of a device's Instruction Register is to look in the BSDL file for that device. The IR length is defined in the following line:
attribute INSTRUCTION_LENGTH of [Device] : entity is [length];
For example:
For an XCV100 BG256, this line would read:
attribute INSTRUCTION_LENGTH of XCV100_BG256 : entity is 5;
Some IR lengths for commonly used Xilinx device families:
Virtex/E: IR=5
18Vxx: IR=8
XPLA3: IR=5
AR# 10850 | |
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日付 | 12/15/2012 |
ステータス | アクティブ |
種類 | 一般 |