• On-Chip ROM
  • 128K × 16-Bit Configured for Program Memory
  • Contains 14 TMS320™ DSP Algorithm Standard Compliant Telephony Algorithms
• 40K x 16-Bit On-Chip RAM Composed of Five Blocks of 8K × 16-Bit On-Chip Dual-Access Program/Data RAM
• CST Software in ROM:
  • Data Transfer (Modem up to V.32BIS 14400 bps)
  • Telephony Signals Processing (DTMF, CPTD, Caller ID)
  • Voice Processing (Echo Canceller, G726, VAD, CNG, AGC)
• Configurable in Either:
  • Chipset Mode: Stand-Alone Telephony/Data Modem (ROM-Only Code Execution)
  • Flex Mode: Code Execution From RAM, ROM, or External.
• 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
• Exponent Encoder to Compute an Exponent Value of a 40-Bit Accumulator Value in a Single Cycle
• Data Bus With a Bus Holder Feature
• Extended Addressing Mode for 8M × 16-Bit Maximum Addressable External Program Space
• Enhanced External Parallel Interface (XIO2)
• 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 Programmable Phase-Locked Loop (PLL) Clock Generator With External Clock Source
  • Two 16-Bit Timers
  • Six-Channel Direct Memory Access (DMA) Controller
  • Two Multichannel Buffered Serial Ports (McBSPs)
  • 8/16-Bit Enhanced Parallel Host-Port Interface (HPI8/16)
  • Universal Asynchronous Receiver/ Transmitter (UART) With Integrated Baud Rate Generator
  • Integrated Direct Access Arrangement (DAA) Module
• Power Consumption Control With IDLE1, IDLE2, and IDLE3 Instructions With Power-Down Modes
• CLKOUT Off Control to Disable CLKOUT
• On-Chip Scan-Based Emulation Logic, IEEE Std 1149.1 (JTAG) Boundary Scan Logic
• 144-Pin Ball Grid Array (BGA) (GGU Suffix)
• 144-Pin Low-Profile Quad Flatpack (LQFP) (PGE Suffix)
• 8.33-ns Single-Cycle Fixed-Point Instruction Execution Time (120 MIPS)
• 3.3-V I/O Supply Voltage
• 1.5-V Core Supply Voltage

All trademarks are the property of their respective owners.
TMS320 is a trademark of Texas Instruments.
IEEE Standard 1149.1-1990 Standard-Test-Access Port and Boundary Scan Architecture.
NOTE: This data manual is designed to be used in conjunction with the TMS320C54x™ DSP Functional Overview (literature number SPRU307).
TMS320C54x is a trademark of Texas Instruments.

The 54CST are based on an advanced modified Harvard architecture that has one program memory bus and three data memory buses. These processors provide an arithmetic logic unit (ALU) with a high degree of parallelism, application-specific hardware logic, on-chip memory, and additional on-chip peripherals. The basis of the operational flexibility and speed of these DSPs is a highly specialized instruction set.

Separate program and data spaces allow simultaneous access to program instructions and data, providing a high degree of parallelism. Two read operations 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. These DSPs also include the control mechanisms to manage interrupts, repeated operations, and function calls.