2/Theory of Operation
2-11
Table 2-1. Custom Chip Pin Description
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PIN TYPE FUNCTION
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A0-A2 Input Address Lines
POR- Input Power-On Reset
SRCK Input 1 MHz Serial-To-Parallel
Conversion Clock
VDD1 Input Positive Voltage Supply
VDD2 Input Positive Voltage Supply
GND1 Input Logic Common
GND2 Input Logic Common
XD0-XD7 Input/Output Microprocessor Data Bus
EQ Output Equal (Data Comparison Equal) Output
TC Output Test Clock Output
WR- Input Write Enable
RD- Input Read Enable
CS- Input Chip Select
VPAT Input Negative Supply for DRV Outputs
TEN Input Test Mode Enable
XSTP Input External Stop
GATE Input Frequency Gate
XSTR Input External Start
XEN Input External Enable
XCK Input External Clock
PSYN Input Pod Sync Clock
VLO Input Logic Low Threshold Reference
Voltage for Inputs CD0-CD7
VHI Input Logic High Threshold Reference
Voltage for Inputs CD0-CD7
CD0-CD7 Input* Channel Inputs
TLI Input Test Channel Comparator Input
TLO Output Test Channel Comparator Output
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* CDn inputs have an internal resistor network to control the voltage at
which they will float (the “invalid” voltage). This voltage is
approximately 1.6 V, through an effective resistance of >50 kilohms.
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Outputs
The Clock and Enable MUX block outputs the XEN and XCK- signals to the
EXT-BUS. These two control signals are sent to each custom chip. Three
parallel inverters invert the XCK signal from U18-9, and ensure a fast
rise time into the relatively high capacitance XCK- line.
General Control Latch Functional Block
The General Control Latch Block, located on the Main PCA, varies input
thresholds, clears fault conditions, and controls the Clock and Enable
Multiplexer. Figure 2-1 shows the block’s functional relationship on the
Содержание 9100 Series
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Страница 15: ...2 Theory of Operation 2 3 Figure 2 1 Input Section Functional Block Diagram ...
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Страница 50: ...4 List of Replaceable Parts 4 2 ...
Страница 54: ...4 List of Replaceable Parts 4 6 Figure 4 1 9100A 017 Final Assembly ...
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Страница 57: ...4 List of Replaceable Parts 4 9 Figure 4 2 A1 Main PCA ...
Страница 59: ...4 List of Replaceable Parts 4 11 Figure 4 3 A2 Top PCA ...
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Страница 66: ...5 Schematic Diagrams 5 2 ...
Страница 67: ...5 Schematic Diagrams 5 3 Figure 5 1 A1 Main PCA ...
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Страница 69: ...5 Schematic Diagrams 5 5 Figure 5 2 A2 Top PCA ...
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Страница 74: ...Index Index 4 ...