Emerson MVME2500 manual Ethernet Interfaces, Internal Timer, Watchdog Timer, FPGA Tick Timer

Functional Description

See Real-Time Clock Battery, on page 77 for more information on the real time clock back-up battery.

4.4.2Internal Timer

The processor's internal timer is composed of eight global timers divided into two groups of four timers each. Each time has four individual configuration registers and they cannot be cascaded together.

4.4.3Watchdog Timer

The onboard FPGA provides programmable 16-bit watchdog timers. It has a 1 ms resolution and generates a board reset when the counter expires. Interrupt is generated to the processor when this occurs. Default value is 60 seconds.

4.4.4FPGA Tick Timer

The MVME2500 supports three independent 32-bit timers that are implemented on the FPGA to provide fully programmable registers for the timers.

4.5Ethernet Interfaces

The MVME2500 has three eTSEC controllers. Each one supports RGII, GMII, and SGMII interface to the external PHY. All controllers can only be untilized when using the RGMII interface. Using the GMII allows only up to two usable controllers.

MVME2500 provides two 10/100/1000 Ethernet interfaces on the front panel and another two are routed to the RTM through the backplane connector. Due to controller limitations, one controller is designed to be routed to the front panel or to the RTM. This setting is possible by using a third party gigabit Ethernet LAN switch with a single enable switch such as PERICOM’s P13L301D. The routing direction can be configured through the on-board dip switch.

Each Ethernet controller has a single dedicated Broadcom BCM54616S with integrated MAC and PHY. The registers of the PHY can be accessed through the processor’s two-wire Ethernet management interface.The front panel RJ45 connector has integrated speed and and activity status indicator LEDs. Isolation transformers are provided onboard for each port.

66 MVME2500 Installation and Use (6806800L01H)