2/Theory of Operation
2-12
Table 2-2. Clock and Enable Mux Truth Table
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Control In Outputs
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CLKMUX ENAMUX XEN XCK
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0 0 BUFENABLE BUFCLOCK
0 1 PSYN BUFCLOCK
1 0 BUFENABLE CAPTURE-
1 1 PSYN CALCLK2
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block diagram. The ICs in this block include: a 74HC273 8-Bit Latch
(U14), an LM324 Quad Op-Amp (U2), two 2N3906 PNP transistors (Ql, Q2), a
74HC08 Quad 2-Input AND Gate (U3), a 74LS30 8-Input NAND Gate (U15), two
74LS112 Dual JK Negative-Edge-Triggered Flip-Flops (U11, U12), a 74HCT32
Quad 2-Input OR Gate (U10), and a 74HCT244 Octal Buffer (U13).
CONTROL REGISTER
Data lines from the A-D-BUS to U14 produce the DCECLR- (Data Compare
Equal Clear), GENCLR- (General Clear), FUSECLR- (Fuse Clear), ENMUX
(Enable Multiplex), CLKMUX (Clock Multiplex), and THRSH (Threshold)
signals. U14 is accessed by a write to $DXXDX, where the ADD- and WR-
signals latch data into U14. The Control Register (U14) is cleared by a
PWRUP (Power Up) signal held low by C44 to ensure a proper reset. See
Figure 2-7 for the Control Register bit position.
The J2 and J3 connectors provide the input to the General Control Latch
block for detection of Clip and Calibration Modules. J2-25 and J3-25 are
the input pins to a detection circuit that provides SWLDET (the
left-hand or A Switch Detect) and SWRDET (the right-hand or B Switch
Detect) signals to generate an interrupt. The mainframe reads the
interrupt register (U13) to determine the reason for an interrupt. See
Figure 2-7 for the interrupt register bit positions.
DATA COMPARISON INPUTS
All 40 lines of the module are compared to programmable data registers
and are qualified by programmable “don’t care” registers. The comparison
is done inside the custom chip(s) between the data on the input lines
and the registers, eight lines per chip. The EQ outputs (pin 55 of the
custom chip) are gated together by U15, and, when they are all high
(i.e., a comparison for all five chips has been detected), an interrupt
is generated and is input to the interrupt register (U13).
FUSE DETECTION
The FUSEDET (Fuse Detect) signal is part of the Multi-Detection area of
the General Control Latch Block. A 1A slow-blow ground fuse located on
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 ...