Artesyn MVME2502, Инструкция по установке и эксплуатации, Страница: 90 / 164

Functional Description
MVME2502 Installation and Use (6806800R96D )
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4.3 System Memory
The P2020 integrated memory controller supports both DDR2 and DDR3 memory devices. It
has one channel and can be configured up to four memory banks with x8, x16 and x32 devices.
Selection of 4GB devices allows support up to 16 GB of memory. ECC is also supported.
The MVME2502 design implements 2 banks of 9x8 devices which includes ECC. The standard
configurations populate a single memory bank of 2Gb DDR3-800 for a 2GB capacity. The
MVME2502 is designed to accommodate 4Gb DDR3 devices supporting up to 8 Gb total when
both memory banks are populated with 4Gb devices.
4.4 Timers
There are various timer functions implemented on the MVME2502 board:
4.4.1 Real Time Clock
The MVME2502 implements a Maxim DS1337 RTC to maintain seconds, minutes, hours, day,
date, month, year accurately. The INT_A pin of the DS1337 is connected to the CPU GPIO[1]
pin to allow the DS1337 to generate interrupts to the CPU. Access to the DS1337 is provided
via the I2C port 0 from the CPU and responds to a base I2C address of $D0.
The MVME2502 provides a socketed 190mAh primary battery to power the RTC when the
module is out of service.
LAD[0:15] cfg_gpinput[0:15] No No default value. Input pins do not
have internal pull-up resistors
LGPL0 cfg_rio_sys_size No 1 Rapid IO interface not used => default
values used
Table 4-2 P2020 Strapping Options (continued)
Functional Signal
Name Reset Configuration
Name
Config
Resistor
Options
Default
Value
Description