2070LX Controller – User Manual 17
Version 1.0
2.4.2.2 Memory
NAND flash memory
The Engine Board has a NAND Flash Memory configured as 256 MB. This device use a highly
multiplexed 8-bit bus to transfer commands, address and data and it is designed to prevent data
corruption during power transitions.
NOR flash memory bank 4M x 16 x 2
The Engine Board has two bank of Parallel NOR Flash Embedded Memory which are configured as 4M x
16bit, the Flash Memory is a 64 Mbit nonvolatile memory that can be read, erased and reprogrammed.
The total NOR flash on the Engine Board is 16 MB.
SRAM 1M x 16
This 16M memory (SRAM), 1M X 16bit, is used to store all of the non-volatile data, it has a battery back-
up in order to avoid losing data during a power failure on AC line. The total SRAM on the Engine Board is
2 MB.
DDR bank memory 64M x 64
The Engine Board has five DDR2 SDRAM which uses a double data rate architecture to achieve high-
speed operation. The DDR2 SDRAM is a high-speed CMOS, dynamic random access memory, it is
internally configured as a multibank DRAM and operates from a differential clock.
Read and write accesses to the DDR2 SDRAM are burst-oriented; accesses start at a selected location
and continue for a programmed number of locations in a programmed sequence. Accesses begin with the
registration of an ACTIVATE command, which is the followed by a READ or WRITE command.
RTC
The RTC circuit in the Engine Board it is implemented by a low-voltage serial-peripheral interface (SPI)
real-time clock with trickle charger DS1390 and a 32.768k external quartz crystal.
The real time clock is a software-settable clock and calendar device with a 100ms resolution. It is
connected to Vcc and to the standby voltage supply and provides information to the processor through
the SPI bus.
The time is provided to the controller at boot time, and then the controller updates the RTC time every
hour.
It monitors the status of Vcc and if a power failure is detected, it automatically disables the bus interface
and switches to the backup supply maintaining the accuracy requirements. Once the power is reapplied
the RTC is used to set the time/date of the OS.
2.4.2.3 Communications
The PowerQUICC II Pro Processor MPC8360 takes care of all communications on the Engine Board.
o Seven serial ports called SP-1, SP-2, SP-3, SP-4, SP-5, SP-6 and SP-8.
o Two Ethernet ports ENET1 and ENET2.
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