4DSP FMC230 User Manual page 14

UM023 FMC230 User Manual
Signals to:
AD9517
Signals to:
AD9129
The FMC is controlled from the carrier hardware through a single SPI communication bus. The
SPI communication bus is connected to a CPLD which has the following tasks:

Distribute SPI access from the carrier hardware along the local devices:
- 2x AD9129 (D/A converters)
- 1x AD9517 (Clock Tree)

Enable/disable internal reference based on a SPI command from the carrier hardware
(REF_EN)

Generate SPI reset for AD9517 (CLK_N_RESET) and both AD9129 (DAC_RST)

Collect local status signals and store them in a register which can be accessed from
the carrier hardware

Drive a LED according to the level of the status signals
UM023
3.3V
CPLD
ADG3304
4
3.3V
BANK
1.8V
BANK
Figure 8: FMC control interface
www.4dsp.com
VADJ
FMC Connector
FMC_TO_CPLD[3..0]
4
r1.11
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