ICS TRIPLEX T3300 Channel isolation module

The VMEbus is inherently big-endian. All devices connected directly to the VMEbus must operate in big-endian mode, regardless of the mode of operation in the processor’s domain. In big-endian mode, byte-swapping is performed first by the Universe ASIC and then by the Raven. The result is transparent to big-endian software (a desirable effect). In little-endian mode, however, software must take the byte-swapping effect of the Universe ASIC and the address reverse-rearranging effect of the Raven into account.

The following table summarizes the features of the MVME2603/2604 single board computers.

Introduction 

This chapter describes the MVME2603/2604 single board computer on a block diagram level. The General Description provides an overview of the MVME2603/2604, followed by a detailed description of several blocks of circuitry. Figure 3-1 shows a block diagram of the overall board architecture. Detailed descriptions of other MVME2603/2604 blocks, including programmable registers in the ASICs and peripheral chips, can be found in the Programmer’s Reference Guide, listed in Appendix D, Related Documentation. Refer to it for a functional description of the MVME2603/2604 in greater depth.

General Description

 The MVME2603/2604 is a VME module single board computer equipped with a PowerPC Series microprocessor. The MVME2603 is equipped with a PowerPC 603 microprocessor; the MVME2604 has a PowerPC 604. 256KB L2 cache (level 2 secondary cache memory) is available as an option on all versions. As shown in the Features section, The MVME2603/2604 offers many standard features desirable in a computer system—such as synchronous and asynchronous serial ports, parallel port, boot ROM and DRAM, SCSI, Ethernet, support for an external disk drive, and keyboard and mouse support—in a single-slot VME package. Its flexible mezzanine architecture allows relatively easy upgrades in memory and functionality.

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