The OMAP-L137 device is a low-power applications
processor based on
an ARM926EJ-S and a TMS320C674x DSP core. It consumes significantly
lower power than other members of the TMS320C6000
platform of DSPs.
The OMAP-L137 device enables original-equipment manufacturers (OEMs) and
original-design manufacturers (ODMs) to quickly bring to market devices featuring
robust operating systems support, rich user interfaces, and high
processing performance life through the maximum flexibility of a fully
integrated mixed processor solution.
The dual-core architecture of the OMAP-L137 device provides benefits
of both DSP and Reduced Instruction Set Computer (RISC) technologies, incorporating a
high-performance TMS320C674x DSP core and an ARM926EJ-S core.
The ARM926EJ-S is a 32-bit RISC processor core that performs 32-bit or
16-bit instructions and processes 32-bit, 16-bit, or 8-bit data. The core uses pipelining so that
all parts of the processor and memory system can operate continuously.
The ARM core has a coprocessor 15 (CP15), protection module, and data
and program Memory Management Units (MMUs) with table look-aside buffers. The ARM core has separate
16-KB instruction and 16KB of data caches. Both memory blocks are four-way associative with virtual
index virtual tag (VIVT). The ARM core also has 8KB of RAM (Vector Table) and 64KB of ROM.
The OMAP-L137 DSP core uses a two-level cache-based architecture. The
Level 1 program cache (L1P) is a 32-KB direct mapped cache and the Level 1 data cache (L1D) is a
32-KB 2-way set-associative cache. The Level 2 program cache (L2P) consists of a 256-KB memory
space that is shared between program and data space. L2 memory can be configured as mapped memory,
cache, or combinations of the two. Although the DSP L2 is accessible by ARM
and other hosts in the system, an additional 128KB of RAM shared memory
is available for use by other hosts without
affecting DSP performance.
The peripheral set includes: a 10/100 Mbps Ethernet MAC (EMAC) with a management data
input/output (MDIO) module; two I2C Bus interfaces; 3 multichannel audio
serial ports (McASPs) with 16/12/4
serializers and FIFO buffers; two 64-bit general-purpose timers each configurable (one configurable
as watchdog); a configurable 16-bit host-port interface (HPI); up to 8 banks of 16 pins of general-purpose input/output (GPIO) with programmable
interrupt/event generation modes, multiplexed with other peripherals; 3 UART interfaces (one with
both RTS and CTS); three enhanced high-resolution
pulse width modulator (eHRPWM) peripherals; three 32-bit enhanced capture (eCAP) module peripherals
which can be configured as 3 capture inputs or 3 auxiliary pulse width modulator (APWM) outputs;
two 32-bit enhanced quadrature encoded pulse (eQEP) peripherals; and 2 external memory interfaces:
an asynchronous and SDRAM external memory interface (EMIFA) for slower memories or peripherals, and
a higher speed memory interface (EMIFB) for SDRAM.
The Ethernet Media Access Controller (EMAC) provides an efficient interface between the
OMAP-L137 device and
the network. The EMAC supports both 10Base-T and 100Base-TX, or 10 Mbps and 100 Mbps in either
half- or full-duplex mode. Additionally, an MDIO interface is available for PHY configuration.
The HPI, I2C, SPI, USB1.1, and USB2.0 ports allow the
OMAP-L137 device 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 OMAP-L137 device has a complete set of development tools for both
the ARM and DSP. 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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