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1.3.5 Memory and I/O Addressing
The cPB-4612 supports up to 2GB of DDR333/266/200 via two right-angled SODIMM sockets. Memory
can be purchased from DTI separately.
See the "Memory Configuration" and "I/O Configuration" topics in Chapter 2 for more information.
1.3.6 Power Ramp Circuitry
The cPB-4612 features a power controller with power ramp circuitry that allows the board's voltages to be
ramped in a controlled fashion. The power ramp circuitry eliminates large voltage or current spikes caused
by hot swapping boards. This controlled ramping is a requirement of the CompactPCI Hot Swap
Specification**, PICMG 2.1, Version 1.0.
The cPB-4612's power controller unconditionally resets the board when it detects that the 3.3V, 5V, and 12V
supplies are below an acceptable operating limit. Minimum voltage thresholds for the cPB-4612 are: 4.75V
(5V supply), 3.0V (3.3V supply), and 10.0V (+12V supply).
1.3.7 Rear-Panel I/O
The following I/O signals are available from the J5 connector at the back of the cPB-4612. These signals are
available for use by a rear panel transition board such as the cRT-4612.
• Serial port (COM2)
• USB Ports 2 and 3
• Secondary IDE channel
• Serial ATA channel
• Video
1.3.8 Video
The cPB-4612 supports VGA video using Intel’s 855GME video interface. The video is accessed through
the CompactPCI J5 connector. The 855GME can share up to 32MB of system memory with the internal
video.
The onboard video from the Intel 855GME may be disabled by a jumper setting. This will allow use of a PCI
video card only. If the onboard video is enabled and a PCI video card is installed, the PCI video card will be
the primary video source.
The Intel 855GME Chipset topic contains a link to the datasheet for this device.
1.3.9 PCI Mezzanine Card (PMC) Interface
The cPB-4612 provides a 64bit/66Mhz PMC site and a 32bit/33Mhz PMC site, both with front panel access.
The 64bit/66Mhz PMC site is only 3.3V tolerant. The 32bit/33Mhz can be configured to be either 3.3V or 5V
via a jumper setting. Voltage keys are also provided to prevent inadvertently placing a PMC card on PMC
site that does not support its VI/O voltage.
The cPB-4612 w/ IDE provides a 64bit/66Mhz PMC site and a 2.5” HDD IDE connector. The 64bit/66Mhz
PMC site is only 3.3V tolerant. Voltage keys are also provided to prevent inadvertently placing a PMC card
on PMC site that does not support its VI/O voltage.
The "PMC Specification" topic in Appendix D contains a link to the sponsoring organization for the PMC
specification.
1.3.10 Dual 10/100/1000 Ethernet Interfaces
The cPB-4612 provides two 10/100/1000BaseTx Ethernet channels (ENET A and ENET B) through the
Intel 82546EB Fast Gigabit Ethernet Multifunction PCI Controller. The 82546EB consists of both the Media