Texas Instruments warranty TMS320C6727, TMS320C6726, TMS320C6722, Description

TMS320C6727, TMS320C6726, TMS320C6722

Floating-Point Digital Signal Processors

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SPRS268E –MAY 2005 –REVISED JANUARY 2007

1.2 Description

The TMS320C672x is the next generation of Texas Instruments'C67x generation of high-performance 32-/64-bit floating-point digital signal processors. The TMS320C672x includes the TMS320C6727, TMS320C6726, and TMS320C6722 devices.(1)

Enhanced C67x+ CPU. The C67x+ CPU is an enhanced version of the C67x CPU used on the C671x DSPs. It is compatible with the C67x CPU but offers significant improvements in speed, code density, and floating-point performance per clock cycle. At 300 MHz, the CPU is capable of a maximum performance of 2400 MIPS/1800 MFLOPS by executing up to eight instructions (six of which are floating-point instructions) in parallel each cycle. The CPU natively supports 32-bit fixed-point, 32-bit single-precision floating-point, and 64-bit double-precision floating-point arithmetic.

Efficient Memory System. The memory controller maps the large on-chip 256K-byte RAM and 384K-byte ROM as unified program/data memory. Development is simplified since there is no fixed division between program and data memory size as on some other devices.

The memory controller supports single-cycle data accesses from the C67x+ CPU to the RAM and ROM. Up to three parallel accesses to the internal RAM and ROM from three of the following four sources are supported:

∙Two 64-bit data accesses from the C67x+ CPU

∙One 256-bit program fetch from the core and program cache

∙One 32-bit data access from the peripheral system (either dMAX or UHPI)

The large (32K-byte) program cache translates to a high hit rate for most applications. This prevents most program/data access conflicts to the on-chip memory. It also enables effective program execution from an off-chip memory such as an SDRAM.

High-Performance Crossbar Switch. A high-performance crossbar switch acts as a central hub between the different bus masters (CPU, dMAX, UHPI) and different targets (peripherals and memory). The crossbar is partially connected; some connections are not supported (for example, UHPI-to-peripheral connections).

Multiple transfers occur in parallel through the crossbar as long as there is no conflict between bus masters for a particular target. When a conflict does occur, the arbitration is a simple and deterministic fixed-priority scheme.

The dMAX is given highest-priority since it is responsible for the most time-critical I/O transfers, followed next by the UHPI, and finally by the CPU.

dMAX Dual Data Movement Accelerator. The dMAX is a module designed to perform Data Movement Acceleration. The Data Movement Accelerator (dMAX) controller handles user-programmed data transfers between the internal data memory controller and the device peripherals on the C672x DSPs. The dMAX allows movement of data to/from any addressable memory space including internal memory, peripherals, and external memory.

The dMAX controller includes features such as the capability to perform three-dimensional data transfers for advanced data sorting, and the capability to manage a section of the memory as a circular buffer/FIFO with delay-tap based reading and writing of data. The dMAX controller is capable of concurrently processing two transfer requests (provided that they are to/from different source/destinations).

External Memory Interface (EMIF) for Flexibility and Expansion. The external memory interface on the C672x supports a single bank of SDRAM and a single bank of asynchronous memory. The EMIF data width is 16 bits wide on the C6726 and C6722, and 32 bits wide on the C6727.

SDRAM support includes x16 and x32 SDRAM devices with 1, 2, or 4 banks.

The C6726 and C6722 support SDRAM devices up to 128M bits.

(1)Throughout the remainder of the document, TMS320C6727 (or C6727), TMS320C6726 (or C6726), and/or TMS320C6722 (or C6722) will be referred to as TMS320C672x (or C672x).

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