User`s guide

10 • Introduction
1.3.11 PCI Mezzanine Card (PMC) Interface
The cPCI-6810/6820 supports up two PMC expansion slots (only one slot on
cPCI-6820). The PMC support 3.3V PCI environment and operates at up to
64bit/66MHz. The PMC expansion card is on the secondary PCI bus of
CNB30LE, i.e., it’s on PCI bus 1. Table below list the PMC availability
depending on the cPCI-6810/6820 model.
cPCI-6810 cPCI-6820
Model #
AA AB AC AD AE
PMC 1 (with
rear I/O)
Yes No Yes No No
PMC 2 Yes Yes No No No
2.5” HDD No Yes No Yes No
Table 2: PMC Options
1.3.12 Watchdog Timer
The cPCI-6810/6820 implements a watchdog timer embedded in the NS
PC87417. The watchdog timer is an 8-bit down counter with 1-minute
resolution. Programmable I/O ports 10h ~ 12h of bank 3 are used to configure
the watchdog timer. The 8-bit timer is programmable from 1~255 minutes.
Once a value is set to the WDT, the timer begins to count down. Any
movement of keyboard, mouse or software will reset the value and reload the
timer again.
The Watchdog output is connected to “reset”. When the
system hangs without software re-trigger, the system will be reset.
The watchdog register is cleared on power-up, enabling system software to
take appropriate action.
1.3.13 Ethernet Interfaces
The onboard Intel 82546EB dual-port gigabit Ethernet controller provides two
ethernet interfaces on cPCI-6810/6820. The 82546EB is implemented on
64-bit/66-MHz PCI bus. The 82546EB supports IEEE 802.3x compliant flow
control and IEEE 802.3ab compliant 10/100/1000 Mbps auto-negotiation. The
ethernet interfaces are connected to J3, which is compliant to PICMG 2.16
specification.
Each Ethernet interface is assigned a unique Ethernet Address of the form
003064XXXXXh where XXXXX is the unique number assigned to a particular
interface and 003064 is the ADLINK Company ID. Each of the board’s
Ethernet Addresses is displayed on a label attached to the board. LED drive
signals for Ethernet link status, activity, and speed are routed to the front
panel.