
Chapter 2—Functional Descriptions
Bus | I/O | Information | Description |
IIC | I | Serial data load | Command to the serial data receiver that the |
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| incoming data is to be read. |
Serial | I | HPHASE | Commanded horizontal phase of picture. |
Serial | I | HLINR | Commanded amount of overall H linearity |
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| correction. |
Serial | I | TBKEY | Commanded amount of top and bottom Keystone |
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| Correction. |
Serial | I | HCENTBLU | Commanded horizontal position of blue raster. |
Serial | I | HCENTGRN | Commanded horizontal position of green raster. |
Serial | I | HCENTRED | Commanded horizontal position of red raster |
Serial | I | WIDTH | Commanded width of raster |
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Horizontal Deflection Board I/O
This section provides a description of the inputs to and outputs from the HDB. The I/O description are arranged by the source/destination of the signal and so the assemblies communicated with are used as the primary heading of each group of signals and then are further subdivided into inputs and outputs. In each case, the signal's direction is noted, with input referring to an input to the RTG, and output to an output from the HDB. (e.g.: under Raster Timing Generator 'Input'; /VFBST refers to the signal /VFBST that is an input to the HDB from the Raster Timing Generator). When test points are provided for the I/O they are noted.
Table
| System Controller Board |
Inputs | Description |
IICCLK | IIC clock line. Unidirectional clock line for control of synchronous data |
| transfer over IIC data bus. |
+SERCLK | Serial data transfer clock (+). Unidirectional, differential clock line from |
| SCB to other circuit boards. Used for synchronous control of serial |
| communication over SERDATA data lines. |
Serial data transfer clock | |
| System Controller Board |
Inputs | Description |
+SERDATA | Serial data transfer. Unidirectional, differential, synchronous serial data |
| communication line. Used for transferring data from SCB to other |
| circuit boards. Uses SERCLK and IIC for control of receiver. |
Serial data transfer | |
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Outputs | Description |
/IICINT | IIC interrupt line. Signal line for slave boards to inform the SCB (master) |
| that there is data to be transferred. Master then polls slaves to |
| determine the source of the interrupt. |
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I/O | Description |
Model 330. 340SC, and 370SC Service Manual |