An apparatus translates transaction requests using a bus protocol translation lookup table (LUT) that comprises bus protocol translation data. A bus protocol translation controller generates the outgoing translated transaction request by translating the incoming transaction request using the bus protocol translation data from the bus protocol translation LUT. The controller translates a received response from the target unit to a response in a first bus protocol for a corresponding requesting unit. Associated methods are also presented. In some examples, the bus protocol translation data corresponds to each of a plurality of requesting units for translating between an incoming transaction request sent via a first bus protocol to an outgoing translated transaction request sent via a second bus protocol for the at least one target unit.