Data Sheet

Thundercomm TurboX C40x SOM Datasheet
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2.3.9. JTAG interface
The SOM has a JTAG interface for debug.
Table 2-14. JTAG interface definition
Pin Name PIN Location Voltage Type Description Notes
JTAG_SRST_N E33 - DI,PU JTAG reset for debug
JTAG_TCK E34 - DI,PU JTAG clock input
JTAG_TDI E35 - DI,PU JTAG data input
JTAG_TDO E36 - - JTAG data output
JTAG_TMS E37 - B,PU JTAG mode-select input
JTAG_TRST_N E38 - DI,PD JTAG reset
QCS_RESIN_N C2 1.8V DI System reset input
QCS_PS_HOLD D8 1.8V DI
Power supply hold
control input
2.3.10. SDIO interface
The SOM supports 4-lane SDIO, SDC2 connected to the SD card.
The SDIO is high-speed signal group. It should protect other sensitive signals/circuits from SD corruption, and
protect SD signals from noisy signals (clock, RF and so on).
 The clock can be up to 50 Mhz.
 The signals routing should be 36-50ohm impedance control.
 CLK to DATA/CMD length matching less than 2mm.
 The spacing to all other signals should 2X line width
 Maximum bus capacitance less than 1.0pF.
 Each trace needs to be next to a ground plane.
Table 2-15. SDIO (SDC2) interface definition
Pin Name PIN Location Voltage Type Description Notes
SDC2 _CLK A14 P2 DO Secure digital controller 2 clock
SDC2 _CMD B16 P2 IO Secure digital controller 2 command
SDC2_DATA_3 A16 P2 IO Secure digital controller 2 data bit 3
SDC2_DATA_2 B14 P2 IO Secure digital controller 2 data bit 2
SDC2_DATA_1 A15 P2 IO Secure digital controller 2 data bit 1
SDC2_DATA_0 B15 P2 IO Secure digital controller 2 data bit 0
GPIO_59 B28 P3 DI SD_CARD_DET_N need pull up to P3
nicholas.wang_thundercomm.com
2022-07-21 2:34:47 AM CST