Create a 1-Wire Master with Xilinx PicoBlaze

This reference design (RD) describes a 1-Wire^® Master with PicoBlaze™ 8-bit embedded microcontroller design implemented and tested on the Xilinx^® Spartan^®-6 LX9 MicroBoard by Avnet. This example design uses the DS28EA001-Wire digital thermometer with sequence detect and PIO on a peripheral module. This module uses the Pmod™ port standard developed by Digilent Inc.

System Design Block Diagram

The system shown in Figure 1 shows the high-level implementation of the design. The system requires:

• PicoBlaze processor
• 2 BRAMs (each 1024 x 18-bit)
• RS-232 port (USB UART)
• LEDs for alarms
• 681Ω ±1% pullup resistor
• Maxim Integrated DS28EA00 peripheral module (DS28EA00PMB1#)
• Xilinx platform cable USB