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Hytec Electronics Ltd. |
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CAMAC DTM4 Dataway Debug/Test Display Module Product Description The DTM4 stores the state of the dataway bus lines and provides an LED display for manual trouble–shooting, and read–back of the stored signals for computer–controlled systems check–out. General Description The DTM4 Debug/Test Monitor is a single–width CAMAC module which stores the states of the dataway Write, Read and Command lines in internal registers. The state of the registers is displayed on 67 front panel LEDs. The contents of the Write and Command registers can be fed onto the dataway read lines. The module is also very convenient for use as a test adjunct in the Hytec System Crate Controller. Using the DTM4 The dataway Read, Write, X and Q lines are continuously monitored and, at strobe S1, their respective registers are updated. The other dataway lines, except S1 and S2, have their registers updated at S1 and S2 of each dataway cycle. S1 and S2 strobe themselves. Indication The contents of all the registers are continuously displayed on the front panel by light emitting diodes (LEDs). A LAM trigger input sets a LAM status register which is controlled and tested using the register addressing method, and which includes the ability to set the LAM register by an addressed command. The contents of the Write register can be fed onto the dataway Read lines with the command A(0) F(0). The register is cleared by command A(0–15) F(9). The Command register contents can also be fed onto the dataway Read lines when addressed with A(1) F(0)). While the Command register is being read the DTM4 is prevented from updating during that dataway cycle. The allocation of Read lines during a Command register read cycle is detailed in Table 1. 67 LEDs mounted on the front panel indicating the following dataway signals:  Signal Monitoring The dataway S1, S2, B, C, Z, I and 0V lines are fed to rear panel sockets for monitoring purposes. Sockets are also provided for LAM trigger and DMA SYNC LAM signals. Examine Pushbutton This control is located on the module front panel and enables the quiescent dataway state to be examined on the front panel LEDs. The S1 and S2 registers are cleared when the pushbutton is operated and are not shown on the LEDs. The EXAMINE control also resets the LAM status. Facilities
Controls
EXAMINE: Mechanical Single–width CAMAC module fully screened with hard–anodised aluminium panels. Power Requirements +6V 1.4A. System Crate The module can be used to monitor the state of the HYTEC SYSTEM CRATE dataway during a branch cycle. This facility is enabled by command S1.B. |
| Hytec Electronics Ltd Post : 5 Cradock Road, Reading, Berkshire, RG2 0JT, England. Phone : +44 (0)118 9757770 Fax : +44 (0)118 9757566 |