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  1. Samtec Razor Beam™ LSHM-150 B2B connector JB1
  2. Samtec Razor Beam™ LSHM-150 B2B connector JB3
  3. Samtec Razor Beam™ LSHM-130 B2B connector JB2
  4. 6-pin header J26 for selecting PL IO-bank supply-voltage VCCIOA
  5. 6-pin header J27 for selecting PL IO-bank supply-voltage VCCIOD
  6. Micro USB Connector J12 (Device or OTG mode)
  7. JTAG/UART header with JX1 ('XMOD FTDI JTAG Adapter'-compatible pin-assignment)
  8. User LED D1 (green)
  9. User LED D2 (red)
  10. SFP+ Connector J1
  11. 50-pin header soldering-pads J17 for access to SoM's IO-banks (LVDS-pairs possible)
  12. 50-pin header soldering-pads J20 for access to SoM's IO-banks (LVDS-pairs possible)
  13. 16-pin header soldering-pads J3, JTAG/UART header ('XMOD FTDI JTAG Adapter' - compatible pin-assignment with 2 additional pins for reference-clock input to 4 x 5 SoM)
  14. 10-pin header soldering-pads J4 for access to SoM's SDIO-port, if available

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The JTAG-interface of the mounted 4 x 5 SoM can be accessed via header JX1 or J3 with two additional pins (15,16) as LVDS-pair to supply the mounted 4 x 5 SoM with an external reference clock-signal.

This header has a 'XMOD FTDI JTAG Adapter'-compatible pin-assignment:

JX1 pinJX1 pin net-nameB2B
C (pin 4)
 J3 pinJ3 pin net-nameB2B
C (pin 4)TCKJB3-100 4TCKJB3-100
D (pin 8)TDOJB3-98 8TDOJB3-98
F (pin 10)TDIJB3-96 10TDIJB3-96
H (pin 12)TMSJB3-94 12TMSJB3-94
A (pin 3)MIO15JB1-86 (usable as UART RX/TX-line)
B (pin 7)
 3MIO15JB1-86 (usable as UART RX/TX-line)
B (pin 7)MIO14JB1-91 (usable as UART RX/TX-line) 7MIO14JB1-91 (usable as UART RX/TX-line)
E (pin 9)BOOTMODEJB1-90 (JTAGSELECT) 9BOOTMODEJB1-90 (JTAGSELECT)
G (pin 11)RESINJB3-17

Table 3: JTAG header JX1 pin-assignment

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 11RESINJB3-17
--- 15CLK0_NJB2-32 (MGT_CLK0_N,

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decoupling capacitator 100 nF)
--- 16CLK0_PJB2-34 (MGT_CLK0_P, decoupling capacitator 100 nF)

Table 3: JTAG header JX1 / J3 pin-15).assignment

On both interfaces (JX1, J3), the pins with the net-names MIO14 and MIO15 are available as user IO's which could be used as UART-interface for example.

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