2/Theory of Operation
2-8
Figure 2-4. Address Decoding Example
low. U6 decodes the latched address lines and sets output line AD8- low.
The logic low on AD8- is gated through U5 and sets up a logic low on
CS0-, thereby enabling custom chip U100. To select custom chip U100 on
Module 3, the address $D0481 is used.
A custom chip may be addressed individually, or all custom chips may be
addressed simultaneously. Address bits A4 through A7 determine the
custom chip selection. To address all chips, an address in the form
$DXXFX must be used (X means don’t care). This address causes the
ALLCHIP- signal (U6-7) to go active, which when gated through U5 and U3,
makes all five chip selects CS0- through CS4- active.
Custom Chip Functional Block
The custom chips each contain eight channels of data acquisition. Each
channel performs 16-bit Cyclic Redundancy Checking (CRC), 23-bit (with
overflow) transition counting, 3-bit asynchronous level history
recording, 3-bit synchronous level history recording, and 1-bit data
comparison. The custom chips are used for module control, and are
Summary of Contents for 9100 Series
Page 6: ... iv ...
Page 8: ... vi ...
Page 15: ...2 Theory of Operation 2 3 Figure 2 1 Input Section Functional Block Diagram ...
Page 16: ...2 Theory of Operation 2 4 Figure 2 2 Output Section Functional Block Diagram ...
Page 19: ...2 Theory of Operation 2 7 Figure 2 3 Input Section Address Decoding Summary ...
Page 42: ...2 Theory of Operation 2 30 ...
Page 50: ...4 List of Replaceable Parts 4 2 ...
Page 54: ...4 List of Replaceable Parts 4 6 Figure 4 1 9100A 017 Final Assembly ...
Page 55: ...4 List of Replaceable Parts 4 7 Figure 4 1 9100A 017 Final Assembly cont ...
Page 57: ...4 List of Replaceable Parts 4 9 Figure 4 2 A1 Main PCA ...
Page 59: ...4 List of Replaceable Parts 4 11 Figure 4 3 A2 Top PCA ...
Page 64: ...4 List of Replaceable Parts 4 16 ...
Page 66: ...5 Schematic Diagrams 5 2 ...
Page 67: ...5 Schematic Diagrams 5 3 Figure 5 1 A1 Main PCA ...
Page 68: ...5 Schematic Diagrams 5 4 Figure 5 1 A1 Main PCA cont ...
Page 69: ...5 Schematic Diagrams 5 5 Figure 5 2 A2 Top PCA ...
Page 70: ...5 Schematic Diagrams 5 6 Figure 5 2 A2 Top PCA cont ...
Page 74: ...Index Index 4 ...