User's Manual

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10.1 Overview
10.2 Reset Pins
10.3 Device Configurations at Reset
Overview
There are different types of reset in the TMS320DM643x DMP. The types of reset differ by how they are
initiated and/or by their effect on the chip. Each type is briefly described in Table 10-1 . Refer to the
device-specific data manual for more details on each of the reset types.
Table 10-1. Reset Types
Type Initiator Effect
POR (Power-On-Reset) POR pin low Total reset of the chip (cold reset). Resets all
modules including memory, emulation logic. The
power-on reset ( POR) pin must be driven low
during power ramp of the device. Device boot and
configuration pins are latched.
Warm Reset RESET pin low Resets all modules including memory, except
emulation logic. Emulator stays alive during warm
reset. Device boot and configuration pins are
latched.
Max Reset DSP emulator or Watchdog Timer (Timer 2). Same effect as warm reset, except the device boot
and configuration pins are not re-latched.
Module/Peripheral Local DSP or external host software Independently resets a specific module. Module
Reset reset is intended as a debug tool, not necessarily
as a tool to use in production.
DSP Local Reset External host software Resets the DSP CPU. DSP internal memories
(L1P, L1D, and L2) are not reset.
There are two device-level global reset pins on the DM6437 DMP: Power-On-Reset ( POR) and warm
reset ( RESET). See device-specific data manual for more details on these reset pins.
Upon POR and warm reset, the DM6437 DMP latches the values from the boot and configuration pins.
Refer to device-specific data manual for the list of boot and configuration pins, and the device's default
states.
Reset92 SPRU978E – March 2008
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