AM3874 datasheet(182/361 Pages) TI

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AM3874, AM3871

SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013

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Software initiates a Software Global Cold Reset by writing a "1" to the RST_GLOBAL_COLD_SW bit in

the PRM_RSTCTRL register in the PRCM.

For more detailed information on the PRM_RSTCTRL register, see the PRCM Registers section of the

Power, Reset, and Clock Management (PRCM) Module chapter of the AM387x Sitara™ ARM Processors

Technical Reference Manual (Literature Number: SPRUGZ7).

7.3.7

Software Global Warm Reset

A Software Global Warm Reset is initiated under software control and has the same effect and

requirements as a External Warm Reset (RESET pin), with the following exceptions:

•

BTMODE[15:0] pins are not re-latched

•

RSTOUT_WD_OUT is not 3-stated and is actively driven based on the value previously latched on the

BTMODE[11] pin.

Software initiates a Software Global Warm Reset by writing a "1" to the RST_GLOBAL_WARM_SW bit in

the PRM_RSTCTRL register in the PRCM.

For more detailed information on the PRM_RSTCTRL register, see the PRCM Registers section of the

Power, Reset, and Clock Management (PRCM) Module chapter of the AM387x Sitara™ ARM Processors

Technical Reference Manual (Literature Number: SPRUGZ7).

7.3.8

Test Reset (TRST pin)

A Test Reset is activated by the emulator asserting the TRST pin. The only effect a Test Reset has is to

reset the Test and Emulation Logic.

7.3.9

Local Reset

The Local Reset for various Modules within the device is controlled by programming the PRCM and/or the

Peripheral Module’s internal registers. Only the associated Module is reset when a Local Reset is

asserted, leaving the rest of the device unaffected.

For more details on Peripheral Local Resets, see the Reset Management section of the Power, Reset,

and Clock Management (PRCM) Module chapter of the AM387x Sitara™ ARM Processors Technical

Reference Manual (Literature Number: SPRUGZ7).

7.3.10 Reset Priority

If any of the above reset sources occur simultaneously, the device only processes the highest-priority

reset request. The reset request priorities, from high-to-low, are as follows:

1. Power-on Reset (POR)

2. Test Reset (TRST)

3. External Warm Reset (RESET pin)

4. Emulation Warm Resets

5. Watchdog Reset

6. Software Global Cold/Warm Resets

7.3.11 Reset Status Register

The Reset Status Register (PRM_RSTST) contains information about the last reset that occurred in the

system. For more information on this register, see the Power, Reset, and Clock Management (PRCM)

Module chapter of the AM387x Sitara™ ARM Processors Technical Reference Manual (Literature

Number: SPRUGZ7).

182

Power, Reset, Clocking, and Interrupts

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