Preliminary Technical Data
ADSP-21364
Each of the serial ports supports the left-justified sample pair
and I2S protocols (I2S is an industry standard interface com-
monly used by audio codecs, ADCs and DACs such as the
Analog Devices AD183x family), with two data pins, allowing
four left-justified sample pair or I2S channels (using two stereo
devices) per serial port, with a maximum of up to 24 I2S chan-
nels. The serial ports permit little-endian or big-endian
transmission formats and word lengths selectable from 3 bits to
32 bits. For the left-justified sample pair and I2S modes, data-
word lengths are selectable between 8 bits and 32 bits. Serial
ports offer selectable synchronization and transmit modes as
well as optional µ-law or A-law companding selection on a per
channel basis. Serial port clocks and frame syncs can be inter-
nally or externally generated.
S/PDIF Compatible Digital Audio Receiver/Transmitter
and Synchronous/Asynchronous Sample Rate Converter
The S/PDIF transmitter has no separate DMA channels. It
receives audio data in serial format and converts it into a
biphase encoded signal. The serial data input to the 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
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), or the
sample rate converters (SRC) and are controlled by the SRU
control registers.
The sample rate converter (SRC) contains four SRC blocks and
is the same core as that used in the AD1896 192 kHz Stereo
Asynchronous Sample Rate Converter providing up to 140dB
SNR. The SRC 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 SRC is used to clean up audio data from jittery clock
sources such as the S/PDIF receiver.
Parallel Port
The Parallel Port provides interfaces to SRAM and peripheral
devices. The multiplexed address and data pins (AD15–0) can
access 8-bit devices with up to 24 bits of address, or 16-bit
devices with up to 16 bits of address. In either mode, 8- or 16-
bit, the maximum data transfer rate is 55M bytes/sec.
DMA transfers are used to move data to and from internal
memory. Access to the core is also facilitated through the paral-
lel port register read/write functions. The RD, WR, and ALE
(Address Latch Enable) pins are the control pins for the parallel
port.
Pulse Width Modulation
The PWM module is a flexible, programmable, PWM waveform
generator that can be programmed to generate the required
switching patterns for various applications related to motor and
engine control or audio power control. The PWM generator can
generate either center-aligned or edge-aligned PWM wave-
forms. In addition, it can generate complementary signals on
two outputs in paired mode or independent signals in non-
paired mode (applicable to a single group of four PWM
waveforms).
Serial Peripheral (Compatible) Interface
The ADSP-21364 SHARC processor contains two Serial Periph-
eral Interface ports (SPIs). The SPI is an industry standard
synchronous serial link, enabling the ADSP-21364 SPI compati-
ble 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-21364 SPI compatible peripheral implemen-
tation also features programmable baud rate and clock phase
and polarities. The ADSP-21364 SPI compatible port uses open
drain drivers to support a multimaster configuration and to
avoid data contention.
The entire PWM module has four groups of four PWM outputs
each. Therefore this module generates 16 PWM outputs in total.
Each PWM group produces two pairs of PWM signals on the
four PWM outputs.
The PWM generator is capable of operating in two distinct
modes while generating center-aligned PWM waveforms: single
update mode, or double update mode. In single update mode
the duty cycle values are programmable only once per PWM
period. This results in PWM patterns that are symmetrical
around the mid-point of the PWM period. In double update
mode, a second updating of the PWM registers is implemented
at the mid-point of the PWM period. In this mode, it is possible
to produce asymmetrical PWM patterns that produce lower
harmonic distortion in three-phase PWM inverters.
The sample rate converter (SRC) contains four SRC blocks and
is the same core as that used in the AD1896 192 kHz Stereo
Asynchronous Sample Rate Converter providing up to 140dB
SNR. The SRC 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 SRC is used to clean up audio data from jittery clock
sources such as the S/PDIF receiver.
Rev. PrB
|
Page 7 of 52
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September 2004
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