DSP56311|24-bit General Embedded DSP

Overview

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The DSP56311 is designed with developers of multi-channel communication and networking systems in mind. With 300 million multiply accumulates per second (MMACS) operating performance, the 24-bit DSP56311 DSP offers excellent performance density characteristic of DSP56300 devices—maximizing the number of channels processed in a very small space while providing low power dissipation and excellent thermal performance at a competitive price. The DSP56311 maintains compatibility with all other DSP56300 devices, including application code, simulation models and system development tools.

The DSP56311 features the same enhanced filter coprocessor (EFCOP) found on the DSP56L307 to process filter algorithms such as echo cancelling and voice coding to run in parallel with the core. It is ideal for wireless and wireline infrastructure and Internet telephony applications where a single DSP handles several voice and data channels. Additional performance gains can be achieved through the use of the large on-chip RAM, thus reducing wait state penalty incurred when accessing external memory.

The DSP56311 uses split power supplies to separate the input/output (I/O) and peripheral sections, which operate at 3.3 volts, from the processor core, which runs at 1.8 volts. This approach allows the rest of the system to maintain a 3.3-volt external I/O environment while minimizing voltage and power dissipation in the chip internal logic.

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Features

High-performance DSP56300 core:

150 MMACS (300 MIPS using the EFCOP in filtering applications) with a 150 MHz clock at 1.8 volts
Object code compatible with the DSP56000 core with highly parallel instruction set
Data arithmetic logic unit (data ALU) with fully pipelined 24 x 24-bit parallel
Multiplier-accumulator (MAC), 56-bit parallel barrel shifter (fast shift and normalization, bit stream generation and parsing), conditional ALU instructions and 24-bit or 16-bit arithmetic support under software control
Program control unit (PCU) with position-independent code (PIC) support, addressing modes optimized for DSP applications (including immediate offsets), on-chip instruction cache controller, on-chip memory-expandable hardware stack, nested hardware DO loops and fast auto-return interrupts
Direct memory access (DMA) with six DMA channels supporting internal and external accesses; one-, two-, and three-dimensional transfers (including circular buffering); end-of-block- transfer interrupts; and triggering from interrupt lines and all peripherals
Phase-lock loop (PLL) allows change of low-power divide factor (DF) without loss of lock
Hardware debugging support including on-chip emulation (OnCE) module, JTAG test access port

On-Chip Memories:

128K on-chip RAM total program RAM, instruction cache, X data RAM and Y data RAM sizes are programmable:

Program RAM Size	Instruction Cache Size	X Data RAM Size*	Y Data RAM Size*
32 K x 24-bit	0	48 K x 24-bit	48 K x 24-bit
31 K x 24-bit	1024 x 24-bit	48 K x 24-bit	48 K x 24-bit
96 K x 24-bit	0	16 K x 24-bit	16 K x 24-bit
95 K x 24-bit	1024 x 24-bit	1 6 K x 24-bit	16 K x 2 4-bit
80 K x 24-bit	0	24 K x 24-bit	24 K x 24-bit
79 K x 24-bit	1024 x 24-bit	24 K x 24-bit	24 K x 24-bit
64 K x 24-bit	0	32 K x 24-bit	32 K x 24-bit
63 K x 24-bit	1024 x 24-bit	32 K x 24-bit	32 K x 24-bit
48 K x 24-bit	0	40 K x 24-bit	40 K x 24-bit
47 K x 24-bit	1024 x 24-bit	40 K x 24-bit	40 K x 24-bit

* Includes 10 K x 24-bit shared memory (i.e., memory shared by the core and the EFCOP).

192 x 24-bit bootstrap ROM

Off-chip memory expansion:

Data memory expansion to two 256 K x 24-bit word memory spaces using standard external address lines
Program memory expansion to one 256 K x 24-bit word memory space using standard external address lines
External memory expansion port
Chip select logic for glueless interface to SRAMs

On-chip peripherals:

3.3-volt I/O interface enhanced 8-bit parallel host interface (HI08) supports a variety of buses (for example, ISA) and provides glueless connection to a number of industry-standard microcomputers, microprocessors and DSPs
Two enhanced synchronous serial interfaces (ESSI0 and ESSI1), each with one receiver and three transmitters
Serial communications interface (SCI) with baud-rate generator
Triple timer module
Up to 34 programmable general-purpose I/O (GPIO) signals, depending on which peripherals are enabled
Enhanced filter coprocessor (EFCOP) running in parallel with the core

Reduced power dissipation:

Very low-power CMOS design
Wait and stop low-power standby modes
Fully static design specified to operate down to 0 Hz (DC)
Optimized power management circuitry (instruction-dependent, peripheral-dependent and mode-dependent)