Clock generation | External clocking |
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ch0 | ch1 | ch2 | ch3 | ch4 | ch5 | ch6 | ch7 | Mode | EXRANGE_SINGLE | EXRANGE_BURST_S | EXRANGE_BURST_M | EXRANGE_BURST_L | EXRANGE_BURST_XL | |
x |
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| Standard/FIFO | < 5 MHz | 5 MHz - max |
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x | x |
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| Standard/FIFO | < 2.5 MHz | 2.5 MHz - 7.5 MHz | 7.5 MHz - 17.5 MHz | 17.5 MHz - 36 MHz | > 36 MHz | |
x |
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| x |
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| Standard | < 5 MHz | 5 MHz - max |
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x |
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| x |
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| FIFO | < 2.5 MHz | 2.5 MHz - 7.5 MHz | 7.5 MHz - 17.5 MHz | 17.5 MHz - 36 MHz | > 36 MHz | |
x | x |
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| x | x |
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| Standard | < 2.5 MHz | 2.5 MHz - 7.5 MHz | 7.5 MHz - 17.5 MHz | 17.5 MHz - 36 MHz | > 36 MHz | |
x | x |
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| x | x |
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| FIFO | < 1.3 MHz | 1.3 MHz - 3.8 MHz | 3.8 MHz - 8.8 MHz | 8.8 | MHz - 18 MHz | > 18 MHz |
x | x | x | x |
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| Standard/FIFO | < 1.3 MHz | 1.3 MHz - 3.8 MHz | 3.8 MHz - 8.8 MHz | 8.8 | MHz - 18 MHz | > 18 MHz |
x | x | x | x | x | x | x | x | Standard | < 1.3 MHz | 1.3 MHz - 3.8 MHz | 3.8 MHz - 8.8 MHz | 8.8 | MHz - 18 MHz | > 18 MHz |
x | x | x | x | x | x | x | x | FIFO | < 0.7 MHz | 0.7 MHz - 1.9 MHz | 1.9 MHz - 4.4 MHz | 4.4 | MHz - 9 MHz | > 9 MHz |
How to read this table? If you have activated all eight channels and are using the board in standard mode (not FIFO) and your external clock is known to be around 15 MHz you have to set the EXRANGE_BURST_L for the external range.
Example:
SpcSetParam (hDrv, SPC_CHENABLE, | CHANNEL0 | CHANNEL1 CHANNEL2 CHANNEL3); // | activate | 4 channels | |||
SpcSetParam | (hDrv, SPC_EXTERNALCLOCK, | 1); |
| // | activate | external clock | |
SpcSetParam | (hDrv, SPC_EXTERNRANGE, EXRANGE_BURST_M); | // set external range to Burst M | |||||
External clock with divider
The extra clock divider can be used to divide an external fed in clock by a fixed value. The external clock must be > 1 MS/s. This divided clock is used as a sample clock for the board.
Register | Value | Direction | Description |
SPC_CLOCKDIV | 20040 | r/w | Extra clock divider for external samplerate. Allowed values are listed below |
Available divider values
1 | 2 | 4 | 8 | 10 | 16 | 20 | 40 | 50 | 80 | 100 | 200 |
400 | 500 | 800 | 1000 | 2000 |
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(c) Spectrum GmbH | 61 |
