ZHCS065G March 2011 – January 2024 DAC3482
PRODUCTION DATA
In Single Sync Source mode, the FIFO read pointer reset is handoff between the two clock domains (DATACLK and FIFO Out clock) by simply re-sampling the write pointer reset. Since the two clocks are asynchronous there is a small but distinct possibility of a meta-stable situation during the pointer handoff. As described in the Section 6.3.3, this meta-stable situation can change the latency of the multiple DAC devices by both the FIFO Out clock cycles and DAC clock cycles.
When the PLL is enabled with Single Sync Source mode, the FIFO read pointer is not synchronized by the OSTR signal. Therefore, there is no restriction on the PLL PFD frequency as described in the previous section.