Sram; General-Purpose Timers/Counters; Watchdog Timer; I2O Message Unit - Motorola MVME6100 Installation And User Manual

Chapter 4 Functional Description

SRAM

The MV64360 integrates 2Mb of general-purpose SRAM. It is accessible from the CPU or any
of the other interfaces. It can be used as fast CPU access memory (6 cycles latency) and for off
loading DRAM traffic. A typical usage of the SRAM can be a descriptor RAM for the Gigabit
Ethernet ports.

General-Purpose Timers/Counters

There are four 32-bit wide timers/counters on the MV64360. Each timer/counter can be
selected to operate as a timer or as a counter. The timing reference is based on the MV64360
Tclk input, which is set at 133 MHz. Each timer/counter is capable of generating an interrupt.
Refer to the MV64360 Data Sheet, listed in
information and programming details.

Watchdog Timer

The MV64360 internal watchdog timer is a 32-bit count-down counter that can be used to
generate a non-maskable interrupt or reset the system in the event of unpredictable software
behavior. After the watchdog timer is enabled, it becomes a free running counter that must be
serviced periodically to keep it from expiring. Refer to the MV64360 Data Sheet, listed in
Appendix C, Related
I O Message Unit
2
I O compliant messaging for the MVME6100 board is provided by an I
2
integrated into the MV64360 system controller. The MV64360 messaging unit includes
hardware hooks for message transfers between PCI devices and the CPU. This includes all of
the registers required for implementing the I
Standard specification. For additional details regarding the I
MV64360 Data Sheet, listed in

Four Channel Independent DMA Controller

The MV64360 incorporates four independent direct memory access (IDMA) engines. Each
IDMA engine has the capability to transfer data between any two interfaces. Refer to the
MV64360 Data Sheet, listed in
and programming details.
2
I C Serial Interface and Devices
A two-wire serial interface for the MVME6100 board is provided by a master/slave capable I
serial controller integrated into the MV64360 device. The I
functions. The first function is to optionally provide MV64360 register initialization following a
reset. The MV64360 can be configured (by switch setting) to automatically read data out of a
40
MVME6100 Installation and Use (V6100A/IH2)
Appendix C, Related
Documentation, for additional information and programming details.
O messaging, as defined in the Intelligent I/O (I
2
Appendix C, Related
Appendix C, Related
Documentation, for additional
O messaging unit
2
O messaging unit, refer to the
2
Documentation.
Documentation, for additional information
2
C serial controller provides two basic
O)
2
2
C