i.MX RT1064 Crossover Processors for Consumer Products, Rev. 0, 10/2018
16 NXP Semiconductors
Modules List
3.2 Recommended connections for unused analog interfaces
Table 5 shows the recommended connections for unused analog interfaces.
JTAG_nnnn The JTAG interface is summarized in Table 4. Use of external resistors is unnecessary. However,
if external resistors are used, the user must ensure that the on-chip pull-up/down configuration is
followed. For example, do not use an external pull down on an input that has on-chip pull-up.
JTAG_TDO is configured with a keeper circuit such that the non-connected condition is eliminated
if an external pull resistor is not present. An external pull resistor on JTAG_TDO is detrimental and
should be avoided.
JTAG_MOD is referenced as SJC_MOD in the i.MX RT1064 reference manual. Both names refer
to the same signal. JTAG_MOD must be externally connected to GND for normal operation.
Termination to GND through an external pull-down resistor (such as 1 k) is allowed. JTAG_MOD
set to hi configures the JTAG interface to mode compliant with IEEE1149.1 standard. JTAG_MOD
set to low configures the JTAG interface for common SW debug adding all the system TAPs to the
chain.
NC These signals are No Connect (NC) and should be disconnected by the user.
POR_B This cold reset negative logic input resets all modules and logic in the IC.
May be used in addition to internally generated power on reset signal (logical AND, both internal
and external signals are considered active low).
ONOFF ONOFF can be configured in debounce, off to on time, and max time-out configurations. The
debounce and off to on time configurations supports 0, 50, 100 and 500 ms. Debounce is used to
generate the power off interrupt. While in the ON state, if ONOFF button is pressed longer than the
debounce time, the power off interrupt is generated. Off to on time supports the time it takes to
request power on after a configured button press time has been reached. While in the OFF state,
if ONOFF button is pressed longer than the off to on time, the state will transition from OFF to ON.
Max time-out configuration supports 5, 10, 15 seconds and disable. Max time-out configuration
supports the time it takes to request power down after ONOFF button has been pressed for the
defined time.
TEST_MODE TEST_MODE is for NXP factory use. The user must tie this pin directly to GND.
WAKEUP A GPIO powered by SNVS domain power supply which can be configured as wakeup source in
SNVS mode.
Table 4. JTAG Controller interface summary
JTAG I/O Type On-chip Termination
JTAG_TCK Input 47 kpull-up
JTAG_TMS Input 47 kpull-up
JTAG_TDI Input 47 kpull-up
JTAG_TDO 3-state output Keeper
JTAG_TRSTB Input 47 kpull-up
JTAG_MOD Input 100 kpull-up
Table 3. Special signal considerations (continued)
Signal Name Remarks