Functional Description
All four serial ports use
The interface provided by the PCCchip2 allows the
4contiguous addresses; however, accesses to the CD2401 must be 8 or 16 bits.
The CD2401 supports DMA operations to local memory. Because the CD2401 does not support a retry operation necessary to break VMEbus lock conditions, the CD2401 DMA controllers should not be programmed to access the VMEbus. The hardware does not restrict the CD2401 to onboard DRAM.
Printer Interface
The MVME197LE has a
Ethernet Interface
The 82596CA is used to implement the Ethernet transceiver interface. The 82596CA accesses local RAM using DMA operations to perform its normal functions. Because 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 MVME197LE module is assigned an Ethernet Station Address. This address is $08003E2XXXXX, where XXXXX is the unique
The Ethernet Station Address is displayed on a label attached to the VMEbus P2 connector. In addition, the eight bytes including the Ethernet address are stored in the configuration area of the BBRAM, with the two lower bytes of those set to 0. That is, 08003E2XXXXX0000 is stored in the BBRAM. At an address of $FFFC1F2C, the upper four bytes (08003E2X) can be read. At an address of $FFFC1F30, the lower four bytes (XXXX0000) can be read. Refer to
User’s Manual |
