PORz
Internal Chip Resetn
Warm reset source
assertion
High frequency system input clock
External warm reset assertion
detected on the nRESETIN_OUT pin
Warm reset out driven
on nRESETIN_OUT pin
Duration defined by
PRCM.
PRM_RSTTIME
[7:0]
RSTTIME1
Duration defined by
PRCM.
PRM_RSTTIME
[12:8]
RSTTIME2
EMIF FIFO
drains and
DRAM is put
in self-refresh
Maximum
50 cycles
Tri-stated with
weak pullup
CLK_M_OSC
Tri-stated with
weak pullup
Power, Reset, and Clock Management
Figure 8-22. Warm Reset Sequence (Internal Warm Reset Source)
8.1.7.4.2 Watchdog Timer
There is one watchdog timer on the device. The reset is not blockable.
8.1.7.4.3 Global Warm Software Reset (GLOBAL_SW_WARM_RST)
8.1.7.4.4 Test Reset (TRSTz)
This reset is triggered from TRSTz pin on JTAG interface. This is a non-blockable reset and it resets test
and emulation logic.
NOTE: A PORz reset assertion should cause entire device to reset including all test and emulation logic
regardless of the state of TRSTz Therefore, PORz assertion will achieve full reset of the device even if
TRSTz pin is pulled permanently high and no special toggling of TRSTz pin is required during power ramp
to achieve full POR reset to the device. Further, it is acceptable for TRSTz input to be pulled permanently
low during normal functional usage of the device in the end-system to ensure that all test and emulation
logic is kept in reset.
540
Power, Reset, and Clock Management (PRCM)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated