![Tektronix 318 Technical Manual Download Page 113](http://html1.mh-extra.com/html/tektronix/318/318_technical-manual_1077905113.webp)
TM 11-6625-3145-14
Theory of Operation-318/338 Service
338 A04 ACQ MEMORY BOARD <8> <9>
ACQUISITION MEMORY AND ACQ ADDRESS COUNTER <8>
The acquisition memory and the ACQ address counter circuit consists of data memories for parallel acquisition and the
address counter for these memories. A simplified diagram of the acquisition memory and the ACQ address counter is
shown in Figure 4-20.
Chip Select Latch. The chip select latch (A04U144) is used to enable each 8-bit pair of the acquisition memory and for
identifying the instrument type. It is written to by the MPU with the WRITE BS signal from the A03 ACQ Control board.
Acquisition Memory. The 256-word X 40-bit high-speed memory consists of RAMs A04U116, A04U118, A04U120,
A04U122, A04U124, A04U126, A04U128, A04U130, A04U132, and A04U134. The ACQ memory location of each data bit
to be stored is controlled by the address counter.
These memories operate in either write or read mode. In the write mode, the low level of the WE pulse, applied to pin 8 of
each RAM, stores the input data in the location defined by the ACQ Address Counter. During the write operation, a low on
the CS0, CS1, CS2, CS3, and CS4 lines enables the RAMs. When the RAMs are in the read mode, a high on their WE
input prevents them from accepting new data. A low on the CS1 , , CS, CS3, and CS4 lines enables the RAMs. Data in
the RAMs can be sequentially read by incrementing the ACQ address counter after each read operation. The outputs of
the RAMs are connected to the data selector (A04U142 and A04U144 <9>).
Figure 4-20. 338 Simplified drawing of the acquisition memory and ACQ address counter circuit.
4-52
Summary of Contents for 318
Page 119: ...318 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
Page 517: ...TM 11 6625 3145 14 318 338 4434 923 318 Block Diagram ...
Page 518: ...TM 11 6625 3145 14 318 338 4434 924 338 Block Diagram ...
Page 519: ...TM 11 6625 3145 14 318 338 4434 925 318 Acquisition Module Wiring Diagram ...
Page 520: ...TM 11 6625 3145 14 318 338 4434 926 318 338 Mainframe Wiring Diagram ...
Page 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
Page 522: ...TM 11 6625 3145 14 318 338 4434 928 Figure 9 1 318 A01 Input A Board Component Locations ...
Page 526: ...TM 11 6625 3145 14 ...
Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
Page 532: ...TM 11 6625 3145 14 ...
Page 536: ...TM 11 6625 3145 14 ...
Page 538: ...TM 11 6625 3145 14 ...
Page 539: ...TM 11 6625 3145 14 ...
Page 540: ...TM 11 6625 3145 14 ...
Page 541: ...TM 11 6625 3145 14 ...
Page 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Page 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Page 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Page 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
Page 554: ......
Page 555: ...PIN 058584 ...