signals appropriately to memory block 202 and six i o blocks 150 as illustrated in an exemplary fashion in fig8 for example i o switch matrix 806 may include a number of multiplexers to route the signals such as a 25 1 multiplexer a 16 1 multiplexer a 25 1 multiplexer and a 20 1 multiplexer for data output signals control signals clock control signals and general control signals e g ce and lsr respectively for memory block 202 and a 25 1 multiplexer for data output signals for six i o blocks 150 in a similar fashion i o switch matrix 806 also routes signals from memory block 202 and six i o blocks 150 to routing switch matrix 808 systems and methods are disclosed herein to provide for example one or more interface architectures for a pld for example in accordance with an embodiment of the present invention an interface block is disclosed to support the interface requirements for i o blocks and memory blocks e g combination common interface block cib architecture the interface block implementation may reduce the number of independent cibs for the i o blocks or the memory blocks the interface block may also provide an optimized cib architecture for vertical and horizontal connectivity without compromising routability which may result in reducing and optimizing the required cib area the interface block architecture for example may be beneficial for low cost plds and or for i o intensive pld applications for example in accordance with an embodiment of the present invention an exemplary implementation of a cib architecture disclosed herein may.