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.
