Compact Universal Timing Endpoint Based on White Rabbit with Xilinx Artix7

The Cute-WR series are standalone White Rabbit Node implementations on FPGA Mezzanine Card form factor. The idea is to have a compact, low-cost and common WR NIC for synchronous DAQ front-ends and other applications!
Cute-WR shows the feasibility of the idea; while the Cute-WR-DP expands the Cute-WR to two SFP ports that can support various operation modes.
The Cute-WR-A7 is the enhanced version of the CUTE-WR-DP with an Xilinx Artix7 series FPGA. It inherits similar interfaces from Cute-WR-DP: two SFP ports, two SMA/LEMO connectors, FMC form factor with LPC connector, etc.
The three operation modes of Cute-WR-DP are also supported by Cute-WR-A7:


Normal mode (Cute-WR-A7-NM)

In Normal mode, Cute-WR-A7 acts as a normal WR node with one SFP
port (SFP0).



Cascade mode (Cute-WR-A7-CM)

In CM mode, two ports act as one down-link (SFP1) and one
up-link (SFP0) to support cascade topology. Two ports also
support a simple switch function for normal Ethernet packets.



Parallel mode (Cute-WR-A7-PM)

In PM mode both ports act as down-link port connect to different
WRS, provide redundancy to improve the reliability for safety
related applications. The current firmware doesn't support this
function.

More information: https://ohwr.org/project/cute-wr-a7/wikis/home

Hardware Features:

XC7A35T-2CSG325I (XC7A50T-2CSG325I compatible)
Two SFP sockets that support WR
128Mb QSPI FLASH (N25Q128A13ESE40F)
512Kb I2C EEPROM (24FC512-I/SM)
UART port (TTL level with 3-state buffer)
VITA57 FMC mezzanine with LPC connector
Ruggedized conduction cooled form factor
AD9516 for the main PLL
Mounting options for various VCXOs
Two delay adjustable output channels (11ps increments, 6ns range)
1-Wire Temperature sensor
Current sensor
2 LEMO/SMA for the delay adjustable output
4 front panel LEDs or two bi-color LEDs
3.3v power supply, 2.5A



CUTE-WR-A7 V1.2 HW PIN

    HW Product         - HW PCB           - SDC          - TOP Signal Name    -  Function
1.  Frontend AUX0      - SYNC_DATA0       - B9/A9        - SYNC_CLK_10M_O_P/N -  10M Sync Clock Output
2.  Frontend AUX1      - SYNC_DATA1       - D8/C8        - PPS_O_P/N          -  PPS Output
3.  Status 0 GREEN     - LED_0            - H14          - LED_GREEN_O[0]     -  Port 0 Link&Sync
4.  Status 0 RED       - LED_1            - G14          - LED_RED_O[0]       -  Port 0 Activity
5.  Status 1 GREEN     - LED_2            - H17          - LED_GREEN_O[1]     -  Port 1 Link&Sync
6.  Status 1 RED       - LED_3            - E18          - LED_RED_O[1]       -  Port 1 Activity
7.  EXT_RX             - EXT_RX           - R16          - UART_RX_I          -  UART RX
8.  EXT_TX             - EXT_TX           - R17          - UART_TX_O          -  UART TX
9.  RESET              - EXT_RESV_I       - K15          - RESET_N            -  RESET Signal, low valid
10. LOCK               - EXT_RESV_O       - B17          - LOCK               -  LOCK Signal, high valid
11. FMC WRN_PLL_Clock  - GBTCLK0_M2C_P(N) - AD9516 OUT9  -                    -  125MHz PLL Output
12. FMC TOD_IN         - LA17_CC_P        - P4           - GM_FMC_TOD_IN      -  TOD IN
13. FMC PPS_IN         - LA17_CC_N        - P3           - GM_FMC_PPS_IN      -  PPS IN
14. FMC TOD_TERM_EN    - LA12_P           - B16          - GM_FMC_TOD_TERM_EN -  TOD TERM EN
15. FMC TOD_OUT        - LA23_P           - V8           - GM_FMC_TOD_OUT     -  TOD OUT
16. FMC PPS_TERM_EN    - LA26_N           - L2           - GM_FMC_PPS_TERM_EN -  PPS TERM EN
17. FMC GM_PLL_RESET   - LA28_N           - V6           - GM_FMC_EXT_PLL_RESET     - PLL RESET
18. FMC GM_PLL_CS      - LA30_P           - R3           - GM_FMC_EXT_PLL_CS        - PLL_CS
19. FMC GM_PLL_SCLK    - LA30_N           - T2           - GM_FMC_EXT_PLL_SCLK      - PLL_SCLK
20. FMC GM_PLL_SDI     - LA31_P           - U4           - GM_FMC_EXT_PLL_SDI       - PLL_SDI
21. FMC GM_PLL_SDO     - LA31_N           - V4           - GM_FMC_EXT_PLL_SDO       - PLL_SDO
22. FMC GM_PLL_REFSEL  - LA32_P           - L4           - GM_FMC_EXT_PLL_REFSEL    - PLL_REFSEL
23. FMC GM_PLL_LOCK    - LA32_N           - L3           - GM_FMC_EXT_PLL_LOCK      - PLL_LOCK
24. FMC GM_PLL_SYNC    - LA33_P           - R2           - GM_FMC_EXT_PLL_SYNC      - PLL_SYNC
25. FMC GM_PLL_STAT    - LA33_N           - R1           - GM_FMC_EXT_PLL_STAT      - PLL_STAT
26. FMC PLL_OUT6_P/N   - CLK0_M2C_P/N     - D13/C13      - GM_FMC_EXT_PLL_OUT6_P/N  - 62.5M IN
27. FMC EXT_CLK_IN_P/N - CLK1_M2C_P/N     - E13/D14      - GM_FMC_EXT_CLK_IN_P/N    - 10M In
27. FMC SYS_CLK_OUT_P/N- LA18_CC_P/N      - E16/D16      - GM_SYS_CLK_OUT_P/N       - 62.5M OUT