To Set A Hardware Latch - HP 70427A User Manual

NOTE
Advanced Hardware Control

To Set A Hardware Latch

To Set A Hardware Latch
Latches are set by first selecting the desired block and latch, then evaluating
the existing latch data, calculating new data and entering it.
Step 1 - Determine which latch and bit(s) to set
The following information is needed to determine the correct latch and
bit(s):
•
Block name: this is found as the heading of one of the tables at the end
of this chapter. It can also be found in the lower right corner of the block
diagrams at the end of chapter 13.
•
Latch number: this is found in the tables at the end of this chapter or on
the block diagrams at the end of chapter 13.
•
Bit number(s): this is found in the tables at the end of this chapter or on
the block diagrams at the end of chapter 13.
The block diagrams at the end of chapter 13 label the latches and bits as
follows:
Ln, Bm * 0 = X
1 = Y
(z)
Where n is the latch number, m is the bit number, x and y are the bit's
functions for the corresponding values, z is the bit mnemonic and the (*)
indicates the Power-on/Reset state.
Step 2 - Access the hardware control softkeys
1. Press the softkey.
Service
2. Press the
Hardware Control
Step 3 - Select the block
Press the softkey until the name of the desired block is shown next to
BLOCK
the Block: display.
Step 4 - Select the latch
1. Preset the
LATCH NUMBER
2. Enter the latch number with the numeric keypad and press the
softkey or use the up/down keys to select the latch. (The latch number
will be shown next to the
8-2 HP 70427A/HP 70428A User's Guide
softkey.
softkey.
display.
Latch:
ENTER