Round-robin updating for high speed i/o parallel interfaces

A communication system, comprising:

• a plurality of links wherein each link comprises a data line adapted to transmit a data signal and a clock line adapted to transmit a clock signal;
• a first latch device arranged to latch a signal on the data line of at least one of the plurality of links;
• and
• a first test circuit operatively connected to the plurality of links, wherein the first test circuit tests at least the one of the plurality of links, the first test circuit comprising:
• a first adjustment circuit arranged to generate a first adjustable clock signal from the clock signal of the one of the plurality of links being tested, wherein the first adjustment circuit adjusts a timing of the first adjustable clock signal relative to the data signal of the one of the plurality of links being tested, wherein the first latch device is responsive to the first adjustable clock signal, and
• a first pattern comparator arranged to compare a first latched test pattern signal to a first test pattern signal, wherein the first latched test pattern signal comprises the first test pattern signal latched from the data line of the one of the plurality of links by the first latch device,
• wherein the first test circuit is adapted to perform a round-robin testing of the plurality of the links.