Name: MVME162-263 MOTOROLA Controller IN STOCK
Availability: InStock

Description

The MVME162-263 utilizes two Zilog Z85230 serial port controllers to implement four serial communications interfaces. Each interface supports CTS, DCD, RTS, and DTR control signals, as well as the TXD and RXD transmit/receive data signals. Due to the omission of serial clocks in the MVME162-263 implementation, serial communications are strictly asynchronous. The MVME162-263 hardware supports serial baud rates ranging from 110b/s to 38.4Kb/s.

The Z85230 provides an interrupt vector during interrupt acknowledge cycles, with the vector modified based on the interrupt source within the Z85230. Interrupt request levels are programmed via the MCchip. For detailed information, refer to the Z85230 data sheet listed in this chapter and the MCchip Programming Model in Chapter 3.

The Z85230s are interfaced as DTE (data terminal equipment) with EIA-232-D signal levels. The four serial ports are routed to four RJ45 telephone connectors on the front panel of the MVME162-263.

Ethernet Interface

The MVME162-263 employs the 82596CA to implement the Ethernet transceiver interface. The 82596CA accesses local RAM through DMA operations to perform its normal functions. Since the 82596CA has small internal buffers and the VMEbus has an undefined latency period, buffer overrun may occur if the DMA is programmed to access the VMEbus. Therefore, the 82596CA should not be programmed to access the VMEbus.

Every MVME162-263 with an Ethernet interface is assigned an Ethernet Station Address, which is $08003E2XXXXX, where XXXXX is the unique 5-nibble number assigned to the board (i.e., each MVME162LX has a distinct value for XXXXX).

Each board has its Ethernet Station Address displayed on a label attached to the VMEbus P2 connector. Additionally, the six bytes containing the Ethernet address are stored in the configuration area of the BBRAM (i.e., 08003E2XXXXX is stored in the BBRAM). The upper four bytes (08003E2X) can be read at address $FFFC1F2C, and the lower two bytes (XXXX) can be read at address $FFFC1F30. Refer to the description of the BBRAM and TOD Clock memory map later in this chapter. The MVME162 debugger can retrieve or set the Ethernet address.

If the data in the BBRAM is lost, the user should restore it using the number on the label of the backplane connector P2.

The Ethernet transceiver interface is located on the MVME162-263 main board, and the industry-standard connector is situated on its front panel.

Support functions for the 82596CA are provided by the MCchip ASIC. For detailed programming information, refer to the 82596CA user’s guide and the MCchip section in Chapter 3.

The MVME162-263 supports mass storage subsystems via the industry-standard SCSI bus, which may include hard and floppy disk drives, streaming tape drives, and other mass storage devices. The SCSI interface is implemented using the NCR 53C710 SCSI I/O controller.

Support functions for the 53C710 are provided by the MCchip ASIC. For detailed programming information, refer to the NCR 53C710 user’s guide and the MCchip section in Chapter 3.

SCSI Termination

Those configuring the system must ensure that the SCSI bus is properly terminated at both ends.

The MVME162-263 main module provides terminators for the SCSI bus. The SCSI terminators are enabled or disabled by a jumper on header J14. If the SCSI bus ends at the MVME162-263 module, a jumper must be installed between J14 pins 1 and 2.

The MVME162-263 supplies +5 Vdc to the SCSI bus TERMPWR signal through fuse F4, located near J7. The FUSES LED (part of DS2) on the front panel of the MVME162-263 monitors the SCSI bus TERMPWR signal in addition to LAN power; when the MVME162-263 is connected to an SCSI bus, the FUSES LED lights up when SCSI terminator power is present.

MVME162-263 PDF
MVME162-263

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