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H A R D W A R E
G2, Synthesized from a 16.0 MHz crystal
2.00, 4.00, 8.00, 16.00, 32.00, 34.00, 36.00, 38.00, 40.00, 42.00, 44.00, 46.00, 48.00, 50.00, 52.00,
54.00, 56.00, 58.00, 60.00, 62.00, 64.00, 66.00, 68.00, 70.00, 72.00, 74.00, 76.00, 78.00, 80.00,
82.00, 84.00, 86.00, 88.00, 92.00, 96.00, 100.00, 104.00, 108.00, 112.00, 116.00, 120.00, 124.00,
128.00, 132.00, 136.00, 140.00, 144.00, 148.00, 152.00, 156.00, 160.00, 164.00, 168.00, 172.00,
176.00, 184.00, 192.00, 200.00, 208.00, 216.00, 224.00, 232.00, 240.00, 248.00, 256.00, 264.00,
272.00, 280.00, 288.00, 296.00, 304.00, 312.00, 320.00, 328.00, 336.00, 344.00, 352.00, 368.00,
384.00, 400.00, 416.00, 432.00, 448.00, 464.00, 480.00, 496.00, 512.00, 528.00, 544.00
If there are some unusual requirements for specific frequencies, we can replace the fundamental
crystals on the board to change the possible outputs. Also note that frequencies can be
“nudged” by as much as 0.001% by adding or removing capacitors. In situations with very tight
tolerances (<10ppm) this is basically required.
4.3.3
Duty Cycle
The G0, G1, and G2 clocks only have a 50% duty-cycle when set to frequencies below 350Mhz.
Above this frequency the duty cycle is not guaranteed. Experimentally, it is shown to be better
than 60/40 at high frequencies.
4.3.4
Jitter
The jitter performance of the G0, G1 and G2 synthesizers is very good, but will be a severe
limitation at interface speeds above 400Mhz. Use the Virtex 5 PLLs.
4.4
Ext Clocks
There are two clock networks on the DN9002K10PCI that are designed to provide clocks from
an external frequency reference. EXT0 and EXT1. Each of these clocks is delivered
synchronously to all 6 FPGAs and is suitable for synchronous communication among the
FPGAs.
4.4.1
EXT0
This clock can be sources from either the external clock input SMAs connectors or
daughtercard A.
By default, EXT0 is set to be sourced from the daughtercard A. The source setting can be made
from the USB Controller by selecting settings->DN9002K10PCI clock source.
The syntax for setting this clock from the main.txt file is not yet specified. Contact
[email protected]
If you are writing your own USB or PCI software, the method of changing the source is by
writing to a configuration register. To change the current setting write to configuration register
0xDF27.
0xDF28[4:0] = S23, S1, S0, PLLSEL, CLKSEL
To understand the correct settings, you must read the ICS8745B datasheet on the user CD.
DN9002K10PCI User Guide
www.dinigroup.com
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