The Mux: Difference between revisions
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The state of the Mux ICs in the rack unit is controlled via 3 lines: Chip Select (CS), Clock and data. Before communication with the ICs begins the CS must be cleared (active low). 64 bits of data must then be shifted into the the ICs (clock active rising edge) before setting CS to select the new inputs. The 32x4 Mux is generated using four 8x4 ICs with their outputs commoned together. Therefore the data is organised into four blocks of 16-bits, with each block controlling one of these ICs. For information on the order in which to clock in data, see the datasheet [https://ystv.york.ac.uk/~documents/docs_resources/StationDocumentation/MAX458-MAX459.pdf]. Importantly only one of the Mux ICs should ever be driving each output from the mux, with the outputs on the other three ICs all disabled. | The state of the Mux ICs in the rack unit is controlled via 3 lines: Chip Select (CS), Clock and data. Before communication with the ICs begins the CS must be cleared (active low). 64 bits of data must then be shifted into the the ICs (clock active rising edge) before setting CS to select the new inputs. The 32x4 Mux is generated using four 8x4 ICs with their outputs commoned together. Therefore the data is organised into four blocks of 16-bits, with each block controlling one of these ICs. For information on the order in which to clock in data, see the datasheet [https://ystv.york.ac.uk/~documents/docs_resources/StationDocumentation/MAX458-MAX459.pdf]. Importantly only one of the Mux ICs should ever be driving each output from the mux, with the outputs on the other three ICs all disabled. | ||
==Pinout of "serial" port== | |||
{| class="wikitable" style="float:right;" | |||
|- | |||
! colspan="2" | Controller Pinout | |||
|- | |||
!1 | |||
| +5V power | |||
|- | |||
!2 | |||
|0V ground | |||
|- | |||
!3 | |||
|32x4 crosspoint switch control lines | |||
|- | |||
!4 | |||
|consisting of a clock (rising edge trigger) | |||
|- | |||
!5 | |||
|CS (active-low) and Data | |||
|- | |||
!6 | |||
|NC | |||
|- | |||
!7 | |||
|Station Tuner control (I2C Data) | |||
|- | |||
!8 | |||
|Net Tuner control (I2C Data) | |||
|- | |||
!9 | |||
|Station/Net Tuner common control line (I2C Clock) | |||
|- | |||
|} | |||
==Power supply== | ==Power supply== | ||