TMS320VC5409GGU datasheet(21/89 Pages) TI

21 / 89 page

Functional Overview

April 1999 − Revised February 2004

SPRS082E

3.2.2 On-Chip ROM With Bootloader

A bootloader is available in the standard 5409 on-chip ROM. This bootloader can be used to automatically

transfer user code from an external source to anywhere in the program memory at power up. If the MP/MC

pin is sampled low during a hardware reset, execution begins at location FF80h of the on-chip ROM. This

location contains a branch instruction to the start of the bootloader program. The standard 5409 bootloader

provides different ways to download the code to accommodate various system requirements:

•

Parallel from 8-bit or 16-bit-wide EPROM

•

Parallel from I/O space 8-bit or 16-bit mode

•

Serial boot from serial ports 8-bit or 16-bit mode

•

Host-port interface boot

•

SPI serial EEPROM 8-bit boot mode

The standard on-chip ROM layout is shown in Table 3−5.

Table 3−5. Standard On-Chip ROM Layout†

ADDRESS RANGE

DESCRIPTION

0x0000h − 0xBFFFh

External program space

0xC000h − 0xF7FFh

Reserved

0xF800h − 0xFBFFh

Bootloader

0xFC00h − 0xFEFFh

Reserved

0xFF00h − 0xFF7Fh

Reserved†

0xFF80h − 0xFFFFh

Interrupt vector table

† In the VC5409 ROM, 128 words are reserved for factory device-testing purposes. Application

code to be implemented in on-chip ROM must reserve these 128 words at addresses

FF00h–FF7Fh in program space.

3.2.3 On-Chip RAM

The 5409 device contains 32K × 16-bit of on-chip dual-access RAM (DARAM). The DARAM is composed of

four blocks of 8K words each. Each block in the DARAM can support two reads in one cycle, or a read and

a write in one cycle. The DARAM is located in the address range 0080h−7FFFh in data space, and can be

mapped into program/data space by setting the OVLY bit to one.

3.2.4 On-Chip Memory Security

The 5409 features a 16K-word × 16-bit on-chip maskable ROM.

Customers can arrange to have the ROM of the 5409 programmed with contents unique to any particular

application. A security option is available to protect a custom ROM. The ROM and ROM/RAM security options

are available on the 5409. These security options are described in the TMS320C54x DSP Reference Set,

Volume 1: CPU and Peripherals (literature number SPRU131). When the security options are enabled, JTAG

emulation is inhibited or nonfunctional.

TMS320VC5409GGU Datasheet(PDF) 21 Page - Texas Instruments

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