Real Time Clock; Internal Timer; Watchdog Timer; Fpga Tick Timer - SMART Embedded Computing MVME2500 Installation & Use Manual

Functional Description
4.4.1

Real Time Clock

This operates on 3.3V supply monitoring and battery control function (MAX6364PUT29), a
32.768KHz clock generator (DS32KHZS), and an RTC with alarm (DS1375T).
See
Real-Time Clock Battery on page 85
up battery.
4.4.2

Internal Timer

The processor's internal timer is composed of eight global timers divided into two groups of
four timers each. Each timer has four individual configuration registers and they cannot be
cascaded together.
4.4.3

Watchdog Timer

The on-board 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.
4.4.4

FPGA Tick Timer

The MVME2500 supports three independent 32-bit timers that are implemented on the
FPGA to provide fully programmable registers for the timers.
4.5

Ethernet Interfaces

The MVME2500 has three eTSEC controllers. Each one supports RGII, GMII, and SGMII
interface to the external PHY. All controllers can only be utilized 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
activity status indicator LEDs. Isolation transformers are provided on-board for each port.
72
for more information on the real time clock back-
MVME2500 Installation and Use (6806800L01S)
Functional Description