1. A circuit comprising: a command buffer configured to (i) buffer a plurality of read commands received by said circuit, wherein each said read command has one of a plurality of port values and one of a plurality of identification values and (ii) transmit a tag signal from said circuit in response to servicing a particular read command of said read commands, said tag signal having a particular port value of said port values and a particular identification value of said identification values as determined by said particular read command; and a read buffer configured to transmit a read signal within a plurality of first transfers from said circuit in response to servicing said particular read command.