Overview
The TMS320C25, produced by Texas Instruments, is a second-generation digital signal processor (DSP) within the TMS320 family. This device combines the flexibility of a high-speed controller with the numerical capability of an array processor, offering a powerful and cost-effective alternative to multichip bit-slice processors. The TMS320C25 is processed in CMOS technology, ensuring low power dissipation and high performance.
It is architecturally similar to the TMS32020 but offers several enhancements, including a faster instruction cycle time of 100 ns, additional instructions, and improved memory management. The device is pin-for-pin and object-code compatible with the TMS32020, making it a seamless upgrade for existing designs.
Key Specifications
| Specification | Value |
|---|---|
| Instruction Cycle Time | 100 ns (TMS320C25), 80 ns (TMS320C25-50) |
| On-Chip Data RAM | 544 words |
| On-Chip Program ROM/EPROM | 4K words (TMS320C25), 4K words EPROM (TMS320E25) |
| Total Data/Program Memory Space | 128K words |
| ALU/Accumulator | 32-bit |
| Multiply Capability | 16 × 16-bit multiplier with a 32-bit product |
| Serial Port | Double-buffered serial port for direct codec interface |
| Power Supply | Single 5-V supply |
| Packaging | 68-Pin PGA, PLCC, and CER-QUAD |
Key Features
- Enhanced Instruction Set: 133 instructions, including 24 additional instructions for adaptive filtering, FFTs, and extended-precision arithmetic.
- Memory Management: Block moves for data/program management, repeat instructions for efficient use of program space, and bit-reversed indexed-addressing mode for radix-2 FFTs.
- On-Chip Timer: Memory-mapped 16-bit timer for control operations.
- Serial Interface: Double-buffered serial port for multiprocessing or interfacing to codecs and serial analog-to-digital converters.
- Multi-Processor Capability: Synchronization input for synchronous multiprocessor configurations.
- Low Power Dissipation: CMOS technology for reduced power consumption.
- Hardware Stack: Eight-level hardware stack.
- Auxiliary Registers: Eight auxiliary registers with dedicated arithmetic unit.
Applications
The TMS320C25 is versatile and can be used in a variety of applications, including:
- Signal Processing: Real-time signal processing, adaptive filtering, and Fast Fourier Transforms (FFTs).
- Control Systems: High-speed control systems requiring precise numerical capabilities.
- Telecommunications: Interfacing with codecs and serial analog-to-digital converters.
- Multiprocessing: Synchronous multiprocessor configurations for complex system designs.
- Embedded Systems: Embedded systems requiring low power consumption and high processing power.
Q & A
- What is the instruction cycle time of the TMS320C25?
The instruction cycle time of the TMS320C25 is 100 ns, while the TMS320C25-50 has an instruction cycle time of less than 80 ns.
- How much on-chip data RAM does the TMS320C25 have?
The TMS320C25 has 544 words of on-chip data RAM.
- What types of on-chip program memory are available in the TMS320C25 and TMS320E25?
The TMS320C25 has 4K words of on-chip program ROM, while the TMS320E25 has 4K words of on-chip program EPROM.
- What is the total data/program memory space of the TMS320C25?
The total data/program memory space is 128K words.
- Does the TMS320C25 support multiprocessing?
Yes, the TMS320C25 supports synchronous multiprocessor configurations with a synchronization input.
- What is the power supply requirement for the TMS320C25?
The TMS320C25 requires a single 5-V supply.
- What packaging options are available for the TMS320C25?
The TMS320C25 is available in 68-Pin PGA, PLCC, and CER-QUAD packages.
- Is the TMS320C25 compatible with other TMS320 processors?
Yes, the TMS320C25 is object-code compatible with the TMS32020 and source-code compatible with the TMS320C1x family.
- What additional features does the TMS320C25 have compared to the TMS32020?
The TMS320C25 includes 24 additional instructions, eight auxiliary registers, an eight-level hardware stack, and a bit-reversed indexed-addressing mode.
- How does the on-chip timer function in the TMS320C25?
The on-chip timer is a memory-mapped 16-bit timer that generates a timer interrupt when it decrements to zero and is reloaded with the value from the period register.
