Figure 18 on page shows a simple Slave implemented using one PCL and two ADI gate arrays. ECL-TTL transceivers are required (shown as blocks), but are not specified in the example. Brooktree BT501s or 10124/10125 combinations may be used. One transceiver block is ECL to TTL, one is TTL to ECL and one is bi-directional.
To meet the FASTBUS requirement that unused bits read as zero, some means (not shown) must be included to drive the user bus BD(31:8) to a low level during reads. This might consist of 10k resistors to GND or active buffers driving the bus low.