TNETV1002IDZHK datasheet(53/102 Pages) TI1

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MCU Subsystem Functional Overview

June 2001 -- Revised December 2002

SPRS180C

4.6

Initialization

The RESET input is the master reset that resets both the DSP and MCU subsystems. The RESET_OUT

signal can be used to reset external peripherals under control of the MCU. Table 4--5 describes how reset

events are propagated to the MCU subsystem, the DSP subsystem, and the RESET_OUT pin.

Table 4--5. Reset Management

Activated Reset Signal

MCU Reset

DSP Reset

External Reset

(RESET_OUT)

RESET

Yes

RST_CMD watchdog

Yes

DSP software reset (in register CLKM_CNTL_RST)

Yes

RESET_OUT (software controlled by bit in register

CLKM_CNTL_RST)

Yes

CLKM_CNTL_RST is a control register mapped in the MCU memory space at address 0xFFFF2F10.

When the MCU subsystem is reset, the MCU program counter begins execution at address 0x00000000.

When the DSP subsystem is reset, the DSP program counter begins execution from 0xFF80.

Each MCU subsystem peripheral may be independently held in reset via control bits in the MCU subsystem

leaves all MCU subsystem peripherals active.

4.6.1 Initial MCU Code

Since the MCU begins execution from address 0x00000000 after MCU subsystem reset, the initialization code

for the MCU subsystem must be provided by the memory device connected to the CS0 pin. This code may

be either 32-bit or 16-bit (Thumb) ARM code. The value of the CS3/ROMSIZE16 pin is sampled at the rising

edge of RESET to determine the mode that the ARM7TDMI core will execute.

CS3/ROMSIZE16 INPUT VALUE

AT RESET RISING EDGE

ARM7TDMI INITIAL MODE

16-bit instruction (Thumb) mode

32-bit instruction mode

Similarly, the MCU subsystem initializes the ARM7TDMI for big-endian or little-endian operation based on the

value sampled on the CS4_BIGEND pin at the rising edge of the RESET signal.

CS4/BIGEND INPUT VALUE

AT RESET RISING EDGE

ARM7TDMI INITIAL MODE

Little-endian

Big-endian

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