WHITE BROWN DA 918 Uživatelský manuál stáhnout pdf (Strana 110)

Digital Routing and Clock

Generation

This chapter describes the digital routing and clock routing circuitry on the cDAQ chassis. Refer

to the Digital Routing and Clock Routing sections.

Digital Routing

The digital routing circuitry has the following functions:

• Manages the flow of data between the bus interface and the acquisition/generation

sub-systems (analog input, analog output, digital I/O, and the counters). The digital routing

circuitry uses FIFOs (if present) in each sub-system to ensure efficient data movement.

• Routes timing and control signals. The acquisition/generation sub-systems use these

signals to manage acquisitions and generations. These signals can come from the following

sources:

– Your C Series I/O modules

– User input through the PFI terminals using parallel digital C Series I/O modules or the

NI cDAQ-9188 chassis PFI terminals

• Routes and generates the main clock signals for the cDAQ chassis. To determine the signal

routing options for C Series I/O module(s) installed in the cDAQ chassis, refer to the

Device Routes tab in MAX.

Clock Routing

Figure 6-1 shows the clock routing circuitry of the cDAQ chassis.

Figure 6-1. Clock Routing Circuitry

÷ 4

÷ 200

80 MHz Timebase

100 kHz Timebase

20 MHz Timebase

Onboard

80 MHz

Oscillator

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 126 127

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WHITE BROWN DA 918 Uživatelský manuál Strana 110