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REXROTH FWA-CLM1.3-LA1-04VRS Channel isolation card

Local Reset Operation Local reset (LRST) is a subset of system reset (SRST). Local reset can be generated five ways:

❏ Expiration of the watchdog timer

❏ Pressing the front panel RESET switch (if the system controller function is disabled) ❏ By asserting a bit in the board control register in the GCSR

❏ By SYSRESET*

❏ By powerup reset.

The GCSR allows a VMEbus master to reset the local bus. This feature is very dangerous and should be used with caution. The local reset feature is a partial system reset, not a complete system reset such as powerup reset or SYSRESET*. When the local bus reset signal is asserted, a local bus cycle may be aborted. The VMEchip2 is connected to both the local bus and the VMEbus and if the aborted cycle is bound for the VMEbus, erratic operation may result.

This chapter describes the MVME162

Embedded Controller on a block diagram level. The Functional Description provides an overview of the MVME162, followed by a detailed description of several blocks of MVME162 circuitry. Figure 4-1 shows a block diagram of the MVME162 main module. Figure 4-2 shows a block diagram of the parity DRAM mezzanine module. Descriptions of other MVME162 blocks, including programmable registers in the ASICs and peripheral chips, are given in the MVME162 Embedded Controller Programmer’s Reference Guide. Refer to it for the rest of the functional description of the MVME162.

MVME162 Functional Description

The MVME162 is a high-functionality VMEbus single board computer designed around the MC68040/MC68LC040 chip. It has 1MB, 4MB, or 8MB of DRAM, 512KB of SRAM, 1MB Flash memory, four MVIP IndustryPack interfaces, and two serial ports (one EIA-232-D DCE; one EIA-232-D or EIA530 DCE/DTE). Options include an SCSI mass storage interface, a LAN Ethernet transceiver interface, and a non-VMEbus version.