GE CM6 Hardware Reference Manual page 22

512 MByte, 1 GByte, 2 GByte (future) DDR2 SDRAM,
memory interface with up to 333 MHz memory frequency and 667 MHz data
rate (depending from used CPU and environment condition)
Each memory bank is ECC controlled and on-board soldered
NVRAM
NVRAM build with a 1 Mbit Serial EEPROM via the SMBus
Flash
Up to 128 MByte (future 256 MByte) Flash which includes a Boot Program,
Flash devices write protected by software or hardware jumper
System Controller
Integrated in MPC8641
Internal CPU MPX bus up to 333MHz
DDR2 SDRAM Controller supports up to 4 Gbit devices
Two PCI Express interfaces
Local Bus interface to external devices
Two integrated Gigabit Ethernet MAC controllers
Two DUART 4-wire interfaces
NVSRAM/Real Time Clock
128kByte non-volatile SRAM and RTC device (max 200k STORE operations)
RTC has no external power back-up and will loose time and date after power
off
Watchdog
Two stage Watchdog with interrupt and reset
Timer/Counter
8 timers each 32-bit wide for system timing and periodic interrupt
PMC slot
One 64-bit 66MHz PCI mezzanine slot for standard PMC as well as for rugged
PMC. Part of PMC IO signals available at the rear connectors.
Ethernet
Two Gigabit Ethernet ports at rear
Serial IO
Two serial channels each has a 4-wire interface
COM1 with RS232 driver
COM2 with RS422/485 driver
General Purpose IO
8-bit general purpose IOs individually programmable for input, output and
triggered interrupt
IO signals are available at rear IO (alternative with PMC IO)
CPCI bus
Compact PCI Bus with PCIe/PCI Bridge Pericom PI7C9X110
PICMG 2.0 R3.0 complaint CPCI local bus standard, 32 bit interface for up to 7
slots at 33 MHz or 4 peripheral slots at 66 MHz
Standard 3U backplanes can be used
GE Intelligent Platforms – CM6 Hardware Reference Manual, Fourth Edition Page 21