External clock with divider – Spectrum Brands MC.31XX User Manual
Page 61
Clock generation
External clocking
(c) Spectrum GmbH
61
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:
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.
Available divider values
ch0
ch1
ch2
ch3
ch4
ch5
ch6
ch7
Mode
EXRANGE_SINGLE EXRANGE_BURST_S EXRANGE_BURST_M EXRANGE_BURST_L
EXRANGE_BURST_XL
x
Standard/FIFO
< 5 MHz
5 MHz - max
x
x
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
x
Standard
< 5 MHz
5 MHz - max
x
x
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
x
x
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
x
x
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
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
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
Register
Value
Direction
Description
SPC_CLOCKDIV
20040
r/w
Extra clock divider for external samplerate. Allowed values are listed below
1
2
4
8
10
16
20
40
50
80
100
200
400
500
800
1000
2000