EP7212 Datasheet, PDF (3/136 Pages) Cirrus Logic – HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH LCD CONTROLLER AND DIGITAL AUDIO INTERFACE(DAI)

EP7212
Low-Power System-on-Chip with LCD Controller and Digital Audio Interface
OVERVIEW (cont.)
all system cost. The on-chip boot ROM can be used
in product manufacturing to serially download system
code into system FLASH memory. To further mini-
mize system memory requirements and cost, the
ARM Thumb^ instruction set is supported, providing
for the use of high-speed 32-bit operations in 16-bit
op-codes and yielding industry-leading code density.
The second is the programmable 16- or 32-bit-wide
DRAM interface that allows direct connection of up to
two banks of DRAM, each bank containing up to 256
Mbytes. To assure the lowest possible power con-
sumption, the EP7212 supports self-refresh DRAMs,
which are placed in a low-power state by the device
when it enters the low-power Standby State. EDO
and Fast Page DRAM are supported.
A DMA address generator is also provided that
fetches video display data for the LCD controller from
main DRAM memory. The display frame buffer start
address is programmable. In addition, the built-in
LCD controller can utilize external or internal SRAM
for memory, thus eliminating the need for DRAMs.
Digital Audio Capability
The EP7212 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 EP7212.
Serial Interfaces
The EP7212 includes two 16550-type UARTs for RS-
232 serial communications, both of which have two
16-byte FIFOs for receiving and transmitting data.
The UARTs support bit rates up to 115.2 kbps. An
IrDA SIR protocol encoder / decoder can be option-
ally switched into the RX / TX signals to / from one of
the UARTs to enable these signals to drive an infrared
communication interface directly.
Digital Audio Interface (DAI)
The EP7212 integrates an interface to enable a direct
connection to many low cost, low power, high quality
audio converters. In particular, the DAI can directly
interface with the Crystal^ CS43L41 / 42 / 43 low-
power audio DACs and the Crystal^ CS53L32 low-
power ADC. Some of these devices feature digital
bass and treble boost, digital volume control and
compressor-limiter functions.
Packaging
The EP7212 is available in a 208-pin LQFP package
and a 256-ball PBGA package.
System Design
As shown in system block diagram, simply adding
desired memory and peripherals to the highly
integrated EP7212 completes a low-power system
solution. All necessary interface logic is integrated
on-chip.
DS474PP1
3