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Peripheral
Subsystem
RF-Control
The internal architecture of AD6527 is shown above Figure 3-10. AD6527 regroups three mainsubsys-
tems connected together through a dynamic and flexible communication bus network. It alsoincludes
onboard system RAM (SRAM) and interfaces with external Flash Memory, Basebandconverter functions,
and terminal functions like MMI, SIM and Universal System Connector (USC).The Digital Signal
Processing (DSP) subsystem primarily hosts all the speech processing, channelequalization and channel
codec functions. The code used to implement such functions can be storedin external Flash Memory and
dynamically downloaded on demand into the DSP'sprogram RAM andInstruction Cache.
The micro-controller subsystem supports all the GSM terminal software, including the layer 1, 2 and 3of
the GSM protocol stack, the MMI, and applications software such as data services, test andmaintenance.
It is tightly associated with on-chip system SRAM and also includes boot ROM memorywith a small dedi-
cated routine to facilitate the initialization of the external Flash Memory via codedownload using the on-
chip serial interface to the external Flash Memory interface.The peripheral subsystem is composed of
system peripherals such as interrupt controller, real timeclock, watch dog timer, power management and
a timing and control module. It also includesperipheral interfaces to the terminal functions: keyboard, bat-
tery supervision, radio and display. Boththe DSP and the MCU can access the peripheral subsystem via
the peripheral bus (PBUS).For program and data storage, both the MCU subsystem and the
DSPsubsystem can access the onchip system SRAM and external memory such Flash Memory. The
access to the SRAM module ismade through the RAM Bus (RBUS) under the control of the bus arbitra-
tion logic. Similarly, access tothe Flash Memory is through the parallel External Bus (EBUS).
AD6527/AD6527B
DSP
Subsystem
PBUS
DMA and BUS
ARBITRATION
MUC
Subsystem
(ARM7TDMI
MMI
USC
Figure 3-10 AD6527 ARCHITECTURE
Serial Link
DSP BUS
RBUS IM
SBUS
SRAM
®
)
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3. TECHNICAL BRIEF
AD6535
Audio Baseband
and Power
Management
EBUS
FLASH
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