User's Manual

APPLICANT: MOTOROLA EQUIPMENT TYPE: ABZ89FC4823
User / Operational Manual
Functional Description / Operation of Modules (Draft)
EXHIBIT D1-6
The locations of the connectors on the front of the station control module are shown below.
Control Overview
The Station Control Module (SCM) is described in this section. A general description, identification of controls,
indicators, and inputs/outputs, a functional block diagram, and functional theory of operation are provided. The
information provided is sufficient to give service personnel a functional understanding of the module, allowing
maintenance and troubleshooting to the module level.
General Description
The SCM circuitry performs the digital signal processing, data formatting and audio routing for the base station /
repeater (BR) and provides the external interfaces to the rest of the site.
The SCM uses two TI OMAP1710 processors:
- One for transmit and overall BR control functionalities
- One for all receive functionalities
Both OMAP1710 processors have independent boot Flash and RAM and, therefore can boot independently.
General SCM functionality includes:
• Data and Control interface to the Receiver’s Abacus III devices
• Data and Control interface to the Exciter’s Trident chip set
• Audio Codec interface with MAKO IC
• Host memory size, speed, and types supported
• External ports (Ethernet, USB, speaker and microphone)
• External physical interfaces (switches, connectors, LEDs, external references etc.)
• TX/RX DSP Multi-Channel Buffered Serial Port (MCBSP) interfaces
• Intermodule communication (using SPI)
• Internal station reference generation
Functional Theory of Operation
The following theory of operation describes the operation of the SCM at a functional level. The information is
presented to give the service technician a basic understanding of the functions performed by the module in order
to facilitate maintenance and troubleshooting to the module level.
TX OMAP - The TX DSP is a TI OMAP Multimedia Processor. The OMAP1710 consists of a microprocessor unit
(MPU) subsystem and a digital signal processor (DSP) subsystem.
OMAP1710 has dedicated external memory interface that allow point-to-point connection to standard mobile
SDRAM/DDR and mobile flash devices. It is a low-power device (1.4V Core and 1.8V I/O supply). TX OMAP
handles all transmit tasks of the SCM.
External Memory - Both transmit and receive DSP’s support independent external memory banks.
RAM - The SCM supports Mobile Double Data Rate SDRAM. It has the following basic characteristics: The
maximum external clock rate for the DDR is 90 MHz. Since data is transferred on both clock edges, the effective
data rate is 180 Mwords/s.
Flash - The SCM supports 256 MB external flash memory.
Serial Peripheral Interface (SPI) - The station local and Intermodule SPI Bus is controlled by both TX and RX
OMAP1710 processors, which has an on-chip SPIF (fast SPI) interface. The OMAP1710 SPIF supports master