pc

10.25 pc 11.25 pc

38

34.5 pc

A.2 Operational Environment

The LSIU160 is designed for use in PCI computer systems with an ISA/EISA bracket type. SDMS operates the board, but the design of the board does not prevent the use of other software. An on-board flash memory device is provided to allow BIOS code and open boot code support through PCI and a serial EEPROM.

A.2.1 The PCI Interface

The PCI interface operates as a 64-bit DMA bus master. The connection is made through edge connector J1, which provides connections on both the front and back of the board. The signal definitions and pin numbers conform to the PCI Local Bus Specification Revision 2.2 standard.

Table A.2 and Table A.3 show the signal assignments. The PCI portion of the LSI53C1010 device is powered from the onboard +3.3 V regulator.

Note: The +3.3 V pins are tied together and decoupled with high frequency bypass capacitors to ground. No current from these 3.3 V pins is used on the board. The board derives

pcpower from the +5 V pins, directly and through a 3.3 V voltage regulator. The PCI +3 V/+5 V pins are used to differentiate between a 5 V or a 3.3 V PCI environment.

A-4

Technical Specifications