= Mbx821 002b =


{{Infobox BSP
| BSP_name =  MBX821 002b       
| Manufacturer = Motorola
|Board_URL = http://www.equinox-tech.com/downloads/freescale/MBXA_IH3.pdf
|NVRAM        = 32 KB NVRAM
|Architecture = OS-9 based RTOS
|RAM          = 4MB DRAM
|NVMEM = One bank 32-bit Flash (2MB, 4MB, or 8MB)
|CPU_model    = MPC821 40MHZ
|Serial       = Two additional EIA-232-D serial ports
}}
= Overview =
= Motorola MBX821 002b =

= Specifications =

MBX821 models include:
 * 40 MHz MPC821 processor; 
 * PC/104-Plus; 10BaseT Ethernet; 
 * EIDE and Floppy interfaces; 
 * 32KB NVRAM; 
 * keyboard, mouse, IR, COM1 and COM2 ports; 
 * LCD panel connector

= Processor =

MBX821 models include 40 MHz MPC821 processor. The MPC821 processor is especially well-suited for applications where
lower power is essential, such as portable and/or high-performance
communications systems. The CPU on the MPC821 is a 32-bit PowerPC
implementation incorporating memory management units (MMUs) and
instruction/data caches. It has a real-time clock and a communications
processor module that includes serial communication controllers, serial
management controllers, a serial peripheral interface (SPI) channel, and an
Interprocessor-Integrated Controller (I2C) channel for data exchanges
between the MPC821 and other ICs with I2C capability. The MPC821’s
memory controller supports all available types of memory. Its PCMCIA
controller supports up to two PCMCIA devices (one socket is provided on
the MBX). The MPC821 also incorporates an LCD controller for display
capability.

= DRAM =

The MBX821-002b has 4MB of DRAM, soldered in place. The MBX series embedded controller has provision for either 4MB or
16MB of on-board DRAM, soldered in place. In addition, it
accommodates 8MB to 128MB of expansion DRAM in a 168-pin DIMM
(dual in-line memory module) socket, XU3.
The on-board DRAM is composed of two 16-bit devices (either 1M x 16
or 4M x 16). Parity protection is optional

= Flash Memory =

Flash memory on the MBX821-002b embedded controller consists of 4MB. Flash memory on the MBX series embedded controller consists of 2MB,
4MB, or 8MB of memory in one bank of four devices soldered directly to
the board. The EPPCBug firmware resident in Flash memory is originally
loaded at the factory, but the Flash contents can be reprogrammed if
necessary.

= I/O =

 * Serial I/O - EIA-232-D serial console or terminal port (DCE/DTE)
 * Parallel I/O - IEEE 1284 parallel port with host/peripheral mode selection
 * Ethernet I/O - Support for AUI and 10BaseT Ethernet interface
 * PCMCIA interface - One PCMCIA slot (type I, II, or III devices)
 * LCD interface (MPC821 only) - Support for both active and passive LCD panels via 24-pin header on MPC821-powered MBX boards
 * Floppy disk controller - Support for direct ribbon cable connection to 2.88MB floppy disk drive via header on MBX board
 * Keyboard/mouse interface - Support for keyboard and mouse input via header on MBX board

= NVRAM =

The MBX821-001 embedded controller accommodates 32KB of non- volatile RAM (NVRAM). The MBX series embedded controller accommodates 32KB of Non-Volatile RAM (NVRAM) in a 34-pin socket, XU2. A battery within the
device supplies VCC to the NVRAM when main power is removed. The
NVRAM provides for a low-battery indication which can be read by the
processor. The first 4K of the NVRAM contains the vital product data (VPD) and
should not be used. The remaining NVRAM is available for general use.

= Battery =

MBX series embedded controllers can use 3.0V–3.6V battery power
(either on board, or external via utility connector #1) as a backup power
source for the “keep-alive” power circuits (such as the real-time clock) in
the processor.
The lifetime of the battery is very dependent on the ambient temperature
of the board and the power-on duty cycle. At 70° C, the worst-case elapsed
time for battery protection is four years. Battery warning time is 24 hours
minimum. At lower ambient temperatures the backup time is greatly
extended.
When a board is stored, the on-board battery should be disconnected to
prolong battery life. This is especially important at high ambient
temperatures.

= Block diagram =

[wiki:File:Block_diagram.png File:Block diagram.png]

=  =References==

 *  http://www.equinox-tech.com/downloads/freescale/MBXA_IH3.pdf