ADSP-21469KBZ-ENG2 datasheet(9/56 Pages) AD

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ADSP-21469/ADSP-21469W

Preliminary Technical Data

Rev. PrB

Page 9 of 56

November 2008

The serial ports also contain frame sync error detection logic

where the serial ports detect frame syncs that arrive early (for

example frame syncs that arrive while the transmission/recep-

tion of the previous word is occurring). All the serial ports also

share one dedicated error interrupt.

S/PDIF-Compatible Digital Audio Receiver/Transmitter

and Synchronous/Asynchronous Sample Rate Converter

The S/PDIF receiver/transmitter has no separate DMA chan-

nels. It receives audio data in serial format and converts it into a

biphase encoded signal. The serial data input to the

receiver/transmitter can be formatted as left justified, I2S or

right justified with word widths of 16, 18, 20, or 24 bits.

The serial data, clock, and frame sync inputs to the S/PDIF

receiver/transmitter are routed through the signal routing unit

(SRU). They can come from a variety of sources such as the

SPORTs, external pins, the precision clock generators (PCGs),

and are controlled by the SRU control registers.

The sample rate converter (ASRC) contains four ASRC blocks

and is the same core as that used in the AD1896 192 kHz stereo

asynchronous sample rate converter and provides up to 128 dB

SNR. The ASRC block is used to perform synchronous or asyn-

chronous sample rate conversion across independent stereo

channels, without using internal processor resources. The four

SRC blocks can also be configured to operate together to con-

vert multichannel audio data without phase mismatches.

Finally, the ASRC can be used to clean up audio data from jit-

tery clock sources such as the S/PDIF receiver.

Digital Peripheral Interface (DPI)

The digital peripheral interface provides connections to two

serial peripheral interface ports (SPI), one universal asynchro-

nous receiver-transmitter (UART), 12 flags, a 2-wire interface

(TWI), and two general-purpose timers.

Serial Peripheral (Compatible) Interface

The ADSP-21469 SHARC processor contains two serial periph-

eral interface ports (SPIs). The SPI is an industry-standard

synchronous serial link, enabling the ADSP-21469 SPI-compat-

ible port to communicate with other SPI compatible devices.

The SPI consists of two data pins, one device select pin, and one

clock pin. It is a full-duplex synchronous serial interface, sup-

porting both master and slave modes. The SPI port can operate

in a multimaster environment by interfacing with up to four

other SPI-compatible devices, either acting as a master or slave

device. The ADSP-21469 SPI-compatible peripheral implemen-

tation also features programmable baud rate and clock phase

and polarities. The ADSP-21469 SPI-compatible port uses open

drain drivers to support a multimaster configuration and to

avoid data contention.

UART Port

The ADSP-21469 processor provides a full-duplex Universal

Asynchronous Receiver/Transmitter (UART) port, which is

fully compatible with PC-standard UARTs. The UART port

provides a simplified UART interface to other peripherals or

hosts, supporting full-duplex, DMA-supported, asynchronous

transfers of serial data. The UART also has multiprocessor com-

munication capability using 9-bit address detection. This allows

it to be used in multidrop networks through the RS-485 data

interface standard. The UART port also includes support for 5

to 8 data bits, 1 or 2 stop bits, and none, even, or odd parity. The

UART port supports two modes of operation:

• PIO (programmed I/O) – The processor sends or receives

data by writing or reading I/O-mapped UART registers.

The data is double-buffered on both transmit and receive.

• DMA (direct memory access) – The DMA controller trans-

fers both transmit and receive data. This reduces the

number and frequency of interrupts required to transfer

data to and from memory. The UART has two dedicated

DMA channels, one for transmit and one for receive. These

DMA channels have lower default priority than most DMA

channels because of their relatively low service rates.

The UART port's baud rate, serial data format, error code gen-

eration and status, and interrupts are programmable:

• Supporting bit rates ranging from (fPCLK/ 1,048,576) to

(fPCLK/16) bits per second.

• Supporting data formats from 7 to 12 bits per frame.

• Both transmit and receive operations can be configured to

generate maskable interrupts to the processor.

In conjunction with the general-purpose timer functions, auto-

baud detection is supported.

Timers

The ADSP-21469 has a total of three timers: a core timer that

can generate periodic software interrupts and two general pur-

pose timers that can generate periodic interrupts and be

independently set to operate in one of three modes:

•Pulse waveform generation mode

•Pulse width count/capture mode

• External event watchdog mode

The core timer can be configured to use FLAG3 as a timer

expired signal, and each general-purpose timer has one bidirec-

tional pin and four registers that implement its mode of

operation: a 6-bit configuration register, a 32-bit count register,

a 32-bit period register, and a 32-bit pulse width register. A sin-

gle control and status register enables or disables both general-

purpose timers independently.

2-Wire Interface Port (TWI)

The TWI is a bidirectional 2-wire, serial bus used to move 8-bit

data while maintaining compliance with the I2C bus protocol.

The TWI master incorporates the following features:

• 7-bit addressing

• Simultaneous master and slave operation on multiple

device systems with support for multi master data

arbitration

• Digital filtering and timed event processing

• 100 kbps and 400 kbps data rates

• Low interrupt rate

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