[Figure 1, callouts 11 and 12]
The ZCU216 board has three I2C programmable SI570 low-jitter 3.3V LVDS differential oscillators, two assigned to the DDR4 component memory interface banks (Bank 65 I/F C0: U47 and Bank 69 I/F C1: U130) and one assigned to GTY131 (U48).
On power-up the user clocks default to a pre-programmed output frequency: DDR4 I/F U47 and U130 to 300.000 MHz and GTY I/F U48 to 156.250 MHz.
User applications can change the output frequency of each SI570 within the range of 10 MHz to 810 MHz through the I2C1 bus interface. Power cycling the ZCU216 board reverts user clocks to their default settings.
These oscillators can also be reprogrammed from MSP430 system controller U38 (see TI MSP430 System Controller on the Texas Instruments website for more system controller information and the ZCU216 web page for the ZCU216 System Controller GUI Tutorial (XTP_TBD).
DDR4 Memory Interface C0 (U47) and C1 (U130) SI570:
- Programmable oscillator: Silicon Labs Si570BAB001614DG (10 MHz-810 MHz, 300 MHz default)
- I2C
0x5D - LVDS differential output
- Total Stability: 61.5 ppm
GTY SI570:
- Programmable oscillator: Silicon Labs Si570BAB000544DG (10 MHz-810 MHz, 156.250 MHz default)
- I2C
0x5D - LVDS differential output
- Total stability: 61.5 ppm
The SI5341B and SI570 data sheets can be found on the Silicon Labs website.