The TMS320C54x, TMS320LC54x, and TMS320VC54x fixed-point, digital signal processor (DSP) families (hereafter referred to as the 54x unless otherwise specified) are based on an advanced modified Harvard architecture that has one program memory bus and three data memory buses. These processors also provide an arithmetic logic unit (ALU) that has a high degree of parallelism, application-specific hardware logic, on-chip memory, and additional on-chip peripherals. These DSP families also provide a highly specialized instruction set, which is the basis of the operational flexibility and speed of these DSPs.
Separate program and data spaces allow simultaneous access to program instructions and data, providing the high degree of parallelism. Two reads and one write operation can be performed in a single cycle. Instructions with parallel store and application-specific instructions can fully utilize this architecture. In addition, data can be transferred between data and program spaces. Such parallelism supports a powerful set of arithmetic, logic, and bit-manipulation operations that can all be performed in a single machine cycle. In addition, the C54x, LC54x, and VC54x versions include the control mechanisms to manage interrupts, repeated operations, and function calls.
Advanced Multibus Architecture With Three Separate 16-Bit Data Memory Buses and One Program Memory Bus
40-Bit Arithmetic Logic Unit (ALU) Including a 40-Bit Barrel Shifter and Two Independent 40-Bit Accumulators
17- × 17-Bit Parallel Multiplier Coupled to a 40-Bit Dedicated Adder for Non-Pipelined Single-Cycle Multiply/Accumulate (MAC) Operation
Compare, Select, and Store Unit (CSSU) for the Add/Compare Selection of the Viterbi Operator
Exponent Encoder to Compute an Exponent Value of a 40-Bit Accumulator Value in a Single Cycle
Two Address Generators With Eight Auxiliary Registers and Two Auxiliary Register Arithmetic Units (ARAUs)
Data Bus With a Bus Holder Feature
Address Bus With a Bus Holder Feature (548 and 549 Only)
Extended Addressing Mode for 8M × 16-Bit Maximum Addressable External Program Space (548 and 549 Only)
192K × 16-Bit Maximum Addressable Memory Space (64K Words Program, 64K Words Data, and 64K Words I/O)
On-Chip ROM with Some Configurable to Program/Data Memory
Dual-Access On-Chip RAM
Single-Access On-Chip RAM (548/549)
Single-Instruction Repeat and Block-Repeat Operations for Program Code
Block-Memory-Move Instructions for Better Program and Data Management
Instructions With a 32-Bit Long Word Operand
Instructions With Two- or Three-Operand Reads
Arithmetic Instructions With Parallel Store and Parallel Load
Conditional Store Instructions
Fast Return From Interrupt
On-Chip Peripherals
Software-Programmable Wait-State Generator and Programmable Bank Switching
On-Chip Phase-Locked Loop (PLL) Clock Generator With Internal Oscillator or External Clock Source
Full-Duplex Serial Port to Support 8- or 16-Bit Transfers (541, LC545, and LC546 Only)
Time-Division Multiplexed (TDM) Serial Port (542, 543, 548, and 549 Only)
Buffered Serial Port (BSP) (542, 543, LC545, LC546, 548, and 549 Only)
8-Bit Parallel Host-Port Interface (HPI) (542, LC545, 548, and 549)
One 16-Bit Timer
External-Input/Output (XIO) Off Control to Disable the External Data Bus, Address Bus and Control Signals
Power Consumption Control With IDLE1, IDLE2, and IDLE3 Instructions With Power-Down Modes
