Owner's manual

Chapter 3: Architecture

Functional Overview

All PowerDAQ DIO boards are based on the Motorola 56301 DSP with

full 32-bit 33MHz PCI support. All subsystems, except DIO are resides

on the DSP itself and accessible via PowerDAQ SDK functions. The DIO

subsystem is implemented as a set of 16-bit bi-directional registers with

overvoltage and ESD protection circuitry and pull-up resistors (PDL-DIO

and PDXI-DIO series only). Those registers are controlled by dedicated

logic that manages read/write access and provide direction control. DSP

is capable of monitoring all available input ports and interrupt host PC

on state change on any selected line with edge detection. Initial state

and direction of the DIO ports is programmed via software

(StartUpState program is supplied with PowerDAQ SDK) and stored in

the on-board EEPROM. It takes less, than 10mS after the system reset

to restore those values.

Following user subsystems are present on the DIO board:

• Digital Input

• Digital Output

• Counter-Timers

• Serial ESSI ports

• High-Speed Digital Interrupts

• Calibration/Startup configuration (EEPROM-based)

Difference between PD2-DIO and PDL-DIO boards is a board form-

factor (PDL-DIO is a half-size of PD2-DIO) and a connector used.

PDXI-DIO moved form-factor into the CompactPCI standard and adds a

PXI compatibility.

DSP Processor

All PowerDAQ PD2-DIO boards are based on the Motorola 56301 DSP.

This is a 24-bit 66 MHz processor with an integrated PCI interface. The

PCI interface implements the PCI Local Bus Specifications so the board

is fully auto configured (base address, interrupt)

When the PowerDAQ DIO software is loaded, the PowerDAQ DIO

firmware is downloaded to the DSP via the PCI bus. This firmware

contains all the code necessary to communicate with the board

subsystems and the host PC driver.