THEORY OF OPERATION (TRANSCEIVER) 4.1 - 19
Host Memories
Flash Memory
The 16MByte FLASH Memory (U1102) located near to the micro-controller contains the terminal's
Application Software and the Terminal Code Plug. The Code Plug stores customer related
information and terminal parameters. The Patriot Bravo accesses the data via a 24 bit wide address
bus (A0-A23), a 16 bit wide data bus (DQ0-DQ15), and 8 control lines (EN_CE, EN_OE, EN_WE,
ADV, BURSTCLK, WP, VPP and RESET). When the FLASH Memory has been replaced or the
software needs to be upgraded, the new Code Plug and application software must be programmed
into the FLASH Memory.
SRAM Memory
The 4MByte SRAM (U1103) located near to the micro controller stores data that can change very
frequently, and which is generated and stored by the Application Software during its normal
operation. The information is lost when the terminal is turned off. The Patriot Bravo accesses the
data via a 21 bit wide address bus (A0-A20), a 16 bit wide data bus (IO1-IO16), and 6 control lines
(CS1, CS2, EN_OE, EN_WE, LB, UB).
EEPROM
On the terminal mainboard, an additional 128 kbit serial memory is connected to the SAP interface
of the Patriot Bravo. This EEPROM holds encryption keys and is accessed by the DSP.
Serial Peripheral Interface (SPI)
The Patriot Bravo features two SPI interfaces.
The SPI protocol is used to communicate with the RF IC's ABACUS, ADDAG, JAVELIN, LVFRACN,
ESCORT and PCIC. All these IC's are connected to the Patriot Bravo's QSPIA module. The
interface comprises the lines SPIA_MOSI (TX), SPIA_MISO (RX), SPIA_CS's, and SPIA_CLK. The
SPI bus is a synchronous bus, the timing clock signal CLK is sent while SPI data is transferred.
Therefore, whenever there is activity on either MOSI or MISO, there should be a uniform signal on
CLK.
The Patriot Bravo uses its module QSPIB to communicate with the real time clock (RTC) U0100, the
external UART in the expansion head via the 40 pin connector J0500 and the GPS module via the
24 pin connector J0600.
RS232, USB, SB9600, SBEP Serial Interfaces
The Patriot Bravo uses four serial protocols to communicate with external devices: RS232, USB,
SB9600 and SBEP. The interface lines are available on the rear or front connectors, dependent on
the interface. Not all interfaces can be used at the same time.
SBEP Serial Interface
The Patriot Bravo communicates with the Enhanced Control Head via the SBEP serial interface.
This interface comprises line BUS+ and is available on the 12 pin front connector J0550. Op-amps
U0102-1 and U0102-2 perform buffering and level shifting from 3 volts to 5 volts level. The Patriot
Bravo uses its UARTB for the SBEP serial interface.
6866539D31.book Page 19 Tuesday, March 20, 2007 6:32 PM
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