![background image](http://html2.mh-extra.com/html/rabbit/6000/6000_user-manual_3115352022.webp)
Rabbit 6000 User’s Manual
digi.com
22
2.3.3 Spectrum Spreader
When enabled, the spectrum spreader stretches and compresses the main clock in a complex pattern that
spreads the energy of the clock harmonics over a wider range of frequencies. Note that the spectrum
spreader cannot operate at frequencies above 115 MHz as it uses up too much of the available clock
period, so care must be exercised when using the main PLL.
Figure 2.1 Effects of Spectrum Spreader
There are three settings that correspond to normal and strong spreading in the 0–50 MHz and >50 MHz
main clock range. Each setting will affect the clock cycle differently; the maximum cycle shortening (at
1.8 V and 25°C) is shown in Table 2-4 below.
Table 2-4. Spectrum Spreader Settings
0–50 MHz
50 - 150 MHz
GCM0R
Value
Description
Max. Cycle
Shortening
—
Normal
01xxxxxx
Normal spreading of frequencies
over 50 MHz
2.3 ns
Normal
Strong
00xxxxxx
Normal spreading of frequencies
up to 50 MHz; strong spreading of
frequencies over 50 MHz
3 ns
Strong
—
10xxxxxx
Strong spreading of frequencies up
to 50 MHz; normal spreading of
frequencies over 50 MHz
4.5 ns
Содержание 6000
Страница 1: ...Rabbit 6000 Microprocessor User s Manual 90001108_J...
Страница 11: ...Rabbit 6000 User s Manual digi com 11 1 3 Block Diagram Figure 1 1 Rabbit 6000 Block Diagram...
Страница 43: ...Rabbit 6000 User s Manual digi com 43 4 1 1 Block Diagram...
Страница 57: ...Rabbit 6000 User s Manual digi com 57 5 1 1 Block Diagram...
Страница 88: ...Rabbit 6000 User s Manual digi com 88 7 2 Block Diagram...
Страница 115: ...Rabbit 6000 User s Manual digi com 115 11 1 1 Block Diagram...
Страница 127: ...Rabbit 6000 User s Manual digi com 127 12 1 1 Block Diagram...
Страница 138: ...Rabbit 6000 User s Manual digi com 138 13 1 1 Block Diagram...
Страница 154: ...Rabbit 6000 User s Manual digi com 154 15 1 1 Block Diagram...
Страница 163: ...Rabbit 6000 User s Manual digi com 163 16 1 1 Block Diagram...
Страница 170: ...Rabbit 6000 User s Manual digi com 170 17 1 1 Block Diagram...
Страница 177: ...Rabbit 6000 User s Manual digi com 177 18 1 1 Block Diagram...
Страница 186: ...Rabbit 6000 User s Manual digi com 186 19 1 1 Block Diagram...
Страница 230: ...Rabbit 6000 User s Manual digi com 230 22 2 Block Diagram...
Страница 234: ...Rabbit 6000 User s Manual digi com 234 Figure 22 3 Sample Slow A D Converter Circuit...
Страница 287: ...Rabbit 6000 User s Manual digi com 287 25 1 1 Block Diagram...
Страница 310: ...Rabbit 6000 User s Manual digi com 310 26 1 1 Block Diagram...
Страница 323: ...Rabbit 6000 User s Manual digi com 323 28 1 1 Block Diagram...
Страница 351: ...Rabbit 6000 User s Manual digi com 351 31 1 4 Block Diagram...
Страница 361: ...Rabbit 6000 User s Manual digi com 361 32 1 1 Block Diagram...
Страница 369: ...Rabbit 6000 User s Manual digi com 369 33 2 Block Diagram...
Страница 390: ...Rabbit 6000 User s Manual digi com 390 35 1 1 Block Diagram...
Страница 408: ...Rabbit 6000 User s Manual digi com 408...
Страница 410: ...Rabbit 6000 User s Manual digi com 410...
Страница 411: ...Rabbit 6000 User s Manual digi com 411...
Страница 420: ...Rabbit 6000 User s Manual digi com 420 Figure 37 1 Memory Read and Write Cycles...