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TMS320C6421

Fixed-Point Digital Signal Processor

SPRS346B – JANUARY 2007 – REVISED APRIL 2007

The peripheral set includes: a 10/100 Mb/s Ethernet MAC (EMAC) with a management data input/output

(MDIO) module; a 4-bit transmit, 4-bit receive VLYNQ interface; an inter-integrated circuit (I2C) Bus

interface; a multichannel buffered serial port (McBSP0); a multichannel audio serial port (McASP0) with 4

serializers; 2 64-bit general-purpose timers each configurable as 2 independent 32-bit timers; 1 64-bit

watchdog timer; a user-configurable 16-bit host-port interface (HPI); up to 111-pins of general-purpose

input/output (GPIO) with programmable interrupt/event generation modes, multiplexed with other

peripherals; 1 UART with hardware handshaking support; 3 pulse width modulator (PWM) peripherals; and

2 glueless external memory interfaces: an asynchronous external memory interface (EMIFA) for slower

memories/peripherals, and a higher speed synchronous memory interface for DDR2.

The Ethernet Media Access Controller (EMAC) provides an efficient interface between the C6421 and the

network. The C6421 EMAC supports 10Base-T and 100Base-TX or 10 Mbits/second (Mbps) and 100

Mbps in either half- or full-duplex mode, with hardware flow control and quality of service (QOS) support.

The Management Data Input/Output (MDIO) module continuously polls all 32 MDIO addresses in order to

enumerate all PHY devices in the system.

The I2C and VLYNQ ports allow C6421 to easily control peripheral devices and/or communicate with host

processors.

The rich peripheral set provides the ability to control external peripheral devices and communicate with

external processors. For details on each of the peripherals, see the related sections later in this document

and the associated peripheral reference guides.

The C6421 has a complete set of development tools. These include C compilers, a DSP assembly

optimizer to simplify programming and scheduling, and a Windows™ debugger interface for visibility into

source code execution.

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TMS320C6421 Fixed-Point Digital Signal Processor

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