Theory Of Operation; Figure 4-1. Daqpad-6507/6508 Devices Block Diagram - National Instruments DAQPad-6508 User Manual

Theory of Operation

Power Supply
Controls
Power Supply
Controls
Serial
Configuration
EEPROM
3
Serial EEPROM
Configuration Port
Data
2 USB Microcontroller
Intel 8x930AX
Serial Port
Interface
© National Instruments Corporation
This chapter contains a functional overview of the DAQPad-6507/6508
devices and explains the operation of each functional unit making up the
DAQPad-6507 or DAQPad-6508.
The block diagram in Figure 4-1 illustrates the key functional components
of the DAQPad-6507/6508 devices.
External Power
5 V Supply
Power Supply
Switch
Interrupt Power Supply
Request Controls
FPGA
Bus Wait State Address/Data
Interface Controls
Address/Data
Firmware
SRAM
EEPROM

Figure 4-1. DAQPad-6507/6508 Devices Block Diagram

Address/Data
Control Lines
Address/Data
Interrupt
Control Lines
Controls
Control Lines
Address/Data
Bus
Control Lines
Address/Data
Address/Data
4-1
Chapter
4
+5 V
500 mA
8
Port A
8
Port B
82C55
PPI (A)
6 8
Port C
8
Port A
8
Port B
82C55
PPI (B)
6 8
Port C
6 8
Port A
8
Port B
82C55
PPI (C)
8
Port C
6 8
Port A
8
Port B
82C55
PPI (D)
8
Port C
82C53
Timer
DAQPad-6507/6508 User Manual