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Flash Memory Functional Description
MVME7100 Single Board Computer Installation and Use (6806800E08A)
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4.8.1 Flash Memory
The MVME7100 is designed to provide 128 MB of soldered-on NOR flash memory. Two AMD
+3.3 V devices are configured to operate in 16-bit mode to form a 32-bit flash bank. This flash
bank is also the boot bank and is connected to LBC Chip Select 0 and 1.
Also included is a second bank of NAND flash, up to 32 GB, connected to LBC Chip Select 2.
The VPD flash packet(s) will determine which devices are populated and the size of the devices.
Programming details can be found in the MVME7100 Single Board Computer Programmer’s
Reference manual.
4.8.2 NVRAM
The MVME7100 includes one Freescale 512 MB MRAM device connected to the MC864xD
device control bus to provide a non-volatile memory that has unlimited writes, fast access and
long term data retention without power. The MRAM device selected is also an extended
temperature device with an operating range from -40°C to 105°C/-40°F to 221°F. The MRAM is
organized as 256 K by 16. Refer to the datasheet for additional information
4.8.3 Quad UART (QUART)
The MVME7100 contains one Quad UART device connected to the MC864xD device control
bus to provide additional asynchronous serial ports. The Quad UART provides four
asynchronous serial ports which are routed to the P2 connector. The TTL-level signals of RX,
TX, CTS, and RTS from each port are routed through on-board RS-232 drivers and receivers
to the P2 connector where the signals can be picked up by a transition module. The reference
clock frequency for the QUART is 1.8432 MHz. All UART ports are capable of signaling at up to
115 Kbaud. Refer to the ST16C554D datasheet for additional details and/or programming
information.
4.8.4 Control and Timers PLD
The MVME7100 Control and Timers PLD resides on the local bus. The Control and Timers PLD
provides the following functions on the board:
z Local bus address latch
z Chip selects for flash banks, MRAM, and Quad UART
z System control and status registers
z Four 32-bit tick timers
z Watch Dog Timer
z RTC 1 MHz reference clock