EP7209 Datasheet, PDF (2/128 Pages) Cirrus Logic – Ultra-Low-Power Audio Decoder System-on-Chip

EP7209
FEATURES (cont.)
s Dynamically programmable clock speeds of 18,
36, 49, and 74 MHz at 2.5 V
s Performance matching 100 MHz Intel^®
Pentium-based PC
s OEM customization
— Integrated ARM720T RISC processor
— Up to 25 MHz of CPU processing power available (after
digital audio decoding) for custom features such as soft-
ware EQ or tone control, volume control, spectrum
analyzer, random play order, etc.
— Allows for control of digital voice recorder function
s LCD controller
— Interfaces directly to a single-scan panel monochrome
LCD
— Panel width is programmable from 32 to 1024 pixels in
16-pixel increments
— Video frame buffer size programmable up to 128 kbytes
— Bits per pixel of 1, 2, or 4 bits
s Memory controller
— Decodes up to 6 separate memory segments of up to
256 Mbytes each
— Each segment can be configured as 8, 16, or 32 bits
wide and supports page-mode access
— Programmable access time for conventional
ROM/SRAM/FLASH memory
— Supports Removable FLASH card interface
— Enables connection to removable FLASH card for addi-
tion of expansion FLASH memory modules
s 38,400 bytes (0x9600) of on-chip SRAM for fast
program execution and/or as a frame buffer
s On-chip boot ROM for manufacturing support
s Integrated DAI interface
— Connects directly to a Crystal^® audio DAC
s 27-bits of general-purpose I/O
— Three 8-bit and one 3-bit GPIO port
— Supports scanning keyboard matrix
s SIR (up to 115.2 kbps) infrared encoder/decoder
— IrDA (Infrared Data Association) SIR protocol
encoder/decoder
s DC-to-DC converter interface (PWM)
— Provides two 96 kHz clock outputs with programmable
duty ratio (from 1-in-16 to 15-in-16) that can be used to
drive a DC to DC converter
s 208-pin LQFP or 256-ball PBGA packages
s Full JTAG boundary scan and Embedded ICE
support
OVERVIEW (cont.)
The EP7209 also includes a comprehensive set of
integrated peripherals such as an LCD display con-
troller, an audio DAC interface, and a FLASH memory
interface. Using the EP7209, a portable audio
decoder solution can be built with the addition of an
LCD display, an audio DAC, a FLASH memory sub-
system, and a small number of additional low cost
components.
The EP7209 uses its powerful 32-bit RISC process-
ing engine to implement audio decompression algo-
rithms in software. The nature of the on-board RISC
processor and the availability of efficient C-compilers
and other software development tools ensures that a
wide range of audio decompression algorithms can
easily be ported to and run on the EP7209.
The EP7209 uses external memory for storing appli-
cation code. The use of external memory to support
software audio decompression algorithms ensures
that the audio decompression system solution can be
tailored to the requirements of the application. Soft-
ware can be placed in a low cost mask ROM for price
sensitive applications, or can be placed in external
FLASH memory to enable upgradeable systems. The
EP7209’s 8 kbyte on-board cache and programma-
ble wait state generator ensure that a wide range of
memory options can be utilized.
The EP7209 runs a full ISO-compliant MPEG 1, 2, &
2.5 layer 3 audio decompression engine with less
than 50% of its available processing capability. This
leaves significant processing power available for
product differentiation.
MPEG 1, 2, & 2.5 Layer 3 Object Code Library
Cirrus Logic provides an object code library for
enabling MPEG 1, 2, & 2.5 layer 3 audio decompres-
sion. This library supports the MPEG 1 sample rates
of 48 k, 44.1 k and 32 k bits per second; the MPEG 2
sample rates of 24 k, 22.05 k and 16 k bits per sec-
ond; and the MPEG 2.5 sample rates of 12 k,
11.025 k and 8 k bits per second. In addition to all
standard fixed compressed data rates, the MPEG
layer 3 object code library also supports decompres-
sion of variable bit-rate data streams.
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