GE VMIVME-5521 VMIVME VMEbus board

Description

Model: VMIVME-5521，Due to the large number of goods, only some goods have been uploaded. If you can’t find the goods you want, please consult the seller, and we will serve you wholeheartedly.

The Data Counter Register (DCR) can be programmed to provide a data

word count directly, or to generate an interrupt when a specific number of A/D

conversions have occurred.

VMIVME-5521 Data Counter Control: The data counter can generate an interrupt after a

predetermined number of data words have been stored in the buffer. The counter can

VMIVME-5521 be read directly to monitor the data count. To use the counter to generate an interrupt:

4. Load the data counter with the required data count (Table 4.4.6-1)
5. Set the source control bit D10 in the CCR (Table 4.5.2-1) to “one”.

(This disables the Midscan/Endscan interrupt.)

4. Enable the interrupt as described in Section 4.7.
5. Initiate the scanning operation.

Table 4.4.6-1 shows the sequence required for reading the data counter

directly. The data counter can be accessed at any time, regardless of which operating

mode is selected. Because the counter counts down, the value read is the remaining

data count.

If CSR D11 is cleared, Timer 0’s output is selected as the timer’s output and

the product of the timer’s output will be:

Formula for 16-bit Timer: T0 = Desired Time/.000000160

Where: T0 = Timer 0’s 16-bit value in decimal (1 to 65,535).

VMIVME-5521 Timer = Period of time out in µs up to 10.4856 ms.

If CSR D11 is set, then Timer 1’s output is selected as the timer’s output and

the output of Timer 0 is used as the clock for Timer 1. The period of the timer’s output

will be:

VMIVME-5521 Formula for 2 Cascaded 16-bit Timers: Desired Time/.000000160 = T1 X T0

Where: Time = Period of Timer up to 687.1948 s.

T0 = Timer 0’s 16-bit value in decimal (1 to 65,535).

T1 = Timer 1’s 16-bit value in decimal (1 to 65,535).

Programmed Timer Intervals that take less than the time required to fill the

buffer can cause unpredictable operation and should be avoided.

The time in microseconds, required to fill a buffer is reciprocal of the

sampling rate times the buffer word size. For example, a 64-word buffer and 100 kHz

sampling rate fills in 640 µs.

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