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PicoBlaze 8-bit Embedded Microcontroller www.xilinx.com 79
UG129 (v1.1.2) June 24, 2008
Custom Instruction Op-Codes
R
During instruction set simulation, pBlazIDE displays the readable output port as shown in
Figure 11-8. The port value can be modified from the graphical interface.
Custom Instruction Op-Codes
The pBlazIDE environment supports the INST directive to force the assembler to generate
a custom in-line instruction op-code. The INST directive is used when adding custom
capabilities to the PicoBlaze reference design. However, adding custom capabilities
requires modifications to PicoBlaze hardware.
Figure 11-8: The pBlazIDE DSIO Directive Defines an Output Port That Can Be
Read Back
$02
76543210
$F0
input_output_port_name
User-defined input/
output port name.
Port address
(Port ID #)
Current port value.
Double-click to edit.
UG129_c11_03_060404
Click LED to set or
clear bit for input.