Reference oscillator source: Bits 2 - 0 set the reference oscillator source from which the sample rate is derived. The sources include:

0 0 0 - the digitizer’s internal 20 MHz oscillator. 0 0 1 - backplane trigger line ECLTrg0.

0 1 0 - backplane trigger line ECLTrg1.

0 1 1 - the EXT2 front panel BNC connector.

1 0 0 - backplane 10 MHz (CLK10) signal.

The Arm delay Register

 

 

 

 

base + 5116 and base +5316

 

The arm delay is set using the arm delay registers defined below.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Address

7

6

 

5

4

3

2

 

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

base + 5116

 

 

base + 5116 = arm delay most significant byte

 

 

 

base + 5316

 

 

base + 5316 = arm delay least significant byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register 51: Contains the most significant byte of the arm delay.

 

 

Register 53: Contains the least significant byte of the arm delay.

 

The Arm Count Register

 

 

 

 

base + 5516 and base + 5716

 

 

 

 

 

The arm count is set using the arm count registers defined below.

 

 

 

 

 

 

 

 

 

 

 

 

 

Address

7

6

 

5

4

3

2

 

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

base + 5516

 

 

base + 5516 = arm count most significant byte

 

 

 

base + 5716

 

 

base + 5716 = arm count least significant byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register 55: Contains the most significant byte of the arm count.

 

 

Register 57: Contains the least significant byte of the arm count.

 

The Arm Count Latch Register

 

 

 

 

 

 

base + 5916

 

 

 

 

 

 

 

 

 

 

 

 

The arm count latch register is used to load the arm count and initialize the trigger counters. It is written to three times prior to sending the timebase processor an initiate pulse.

Address

base + 5916

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

register write: loads the arm count and initializes the trigger counters

360 Register Programming

Appendix C

Page 360
Image 360
HP E1429A manual Arm delay Register Base + 5116 and base +5316, Arm Count Register Base + 5516 and base +