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Interface Signals 9

LEC-BASE

2 Interface Signals

This section provides the pin signals for all the non-standard user interfaces on the LEC-BASE.

Signal definitions for standard interfaces such as SATA, USB, PCIe, and DB9 serial connectors

can be found in their respective specification data sheets.

NOTE: The tables in this section define pin sequence using the method in the following exam-

ple: A 10-pin header with two rows of pins, using odd/even numbering, where pin 2 is directly

across from pin 1, is noted as 10 pins, 2 rows, odd/even pin sequence (1, 2).

2.1.1 SD/eMMC (AFB2) Interface

Table 2-4 lists the pin signals of the SD Card ground plane socket, which provides 60-pins, 2

rows, odd/even pin sequence (1, 2) with 0.02" (0.50mm) pitch. These signals are connected to

the SD/eMMC interface at pins S26 through S36 of the SMARC connector over a 3.3 volt level

shifter.

Table 2-4: SD/eMMC (AFB2) Interface Pin Signals

Pin # Signal

GND

2 GND

3 MMC2_D0_3V

GND

6 GND

GND

9 MMC2_D1_3V

GND

12 GND

GND

15 MMC2_D2_3V

GND

21 MMC2_D3_3V

VDD_3V3

GND

27 MMC2_D4_3V

VDD_3V3

GND

30 GND

GND

33 MMC2_D5_3V

GND

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 29 30

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