Various Settings ---- 13
6.3
SJC_MOD Setting
：
JP11
This is the setting for enabling the JTAG debugger unit. The factory default is short-circuited, and under regular
operations does not need to be changed.
The JTAG connector is for connecting with the PARTNER-series JTAG cable. It may be either the ETM type
(CN13) or 20-pin type (CN16) shown below. Concurrent use of both is not permitted. Only ever use either of them.
JTAG signal voltage is 3V. This product will support tracing of maximum 8 bits for the ETM type. The ETM clock
setting should be 1/4 if more than 500 MHz is used as the core clock. While JTAGICE is being used, do not use WFI
(wait
for
interrupt).
/SRST signal is connected to JP12 and also to POR_B (H24) of i.MX31 and RESET_IN_B (J21). The factory default
is POR_B setting. This does not have to be changed for regular operations.
DE signal is connected to JP16 and further to DE_B (C18) of i.MX31. The factory setting of JP16 is open.
Short-circuit this JP if using DE_B.
JP11
Fig.6
JP11 (factory settings)
CN16
JP12
SW2
SW3
CN13
Fig.7
CN13 and 16 JTAG Connectors
6.4
Clock Source Setting
：
JP10
This is used to set the source of feeding clock signals to each PLL of i.MX31. The factory default is X1 (26 MHz).
This does not have to be changed under normal operations.
JP10
Fig.8
JP10, 11 (factory setting)
