Embedded Software for SoC - Grupo de Mecatrônica EESC/USP

Chapter 16
EMBEDDED SW IN DIGITAL AM-FM CHIPSET
M. Sarlotte, B. Candaele, J. Quevremont, and D. Merel
THALES Communications, Gennevilliers France
Abstract. DRM, the new standard for digital radio broadcasting in AM band requires
integrated devices for radio receivers at low cost and very low power consumption. A chipset
is currently designed based upon an ARM9 multi-core architecture. This paper introduces the
application itself, the HW architecture of the SoC and the SW architecture which includes
physical layer, receiver management, the application layer and the global scheduler based on a
real-time OS. Then, the paper presents the HW/SW partitioning and SW breakdown between
the various processing cores. The methodology used in the project to develop, validate and
integrate the SW covering various methods such as simulation, emulation and co-validation is
described. Key points and critical issues are also addressed.
One of the challenges is to integrate the whole receiver in the mono-chip with respect to the
real-time constraints linked to the audio services.
Key words: HW/SW co-design, ARM core, physical layer, AHB multi-layers, network-onchip
1. DRM APPLICATION
DRM (Digital Radio Mondiale) is a new standard promoted by the major
broadcasters and receiver manufacturers. The physical layer is based upon
an OFDM modulation and includes multiple configurations (channel width,
code rate, protection, . . .) to cope with various propagation schemes within
the short and medium waves (0 to 30 MHz). The physical layer provides up
to 78kbits/s of useful data rate. The service layers are mainly composed by
enhanced MP3 audio decoder and data services. The standard also introduces
complementary services like Automatic Frequency Switching (AFS) and
several data services. Figure 16-1 presents the main improvements proposed
in this new standard.
The receiver signal processing reference requires about 500 Mips to handle
the whole treatment.
2. DIAM SOC ARCHITECTURE
A full software implementation will not meet the specific constraints of the
radio receivers in term of die size and power consumption. The first step is
the HW/SW partitioning based upon the existing full-software reference
207
A Jerraya et al. (eds.), Embedded Software for SOC, 207–212, 2003.
© 2003 Kluwer Academic Publishers. Printed in the Netherlands.