SYSTEM AND METHOD FOR CONTROLLING CIRCUIT INPUT-OUTPUT TIMING

摘要

An integrated circuit (IC) includes a plurality of input/output (I/O) terminals through which signals pass into or out of the IC and an I/O timing module. The I/O timing module is configured to add propagation delay to signals passing between the I/O terminals and I/O subsystems of the IC. The I/O timing module includes a plurality of delay elements associated with each of the I/O terminals, a control register associated with each of the I/O terminals, a memory, and I/O delay control logic. The control register is coupled to each of the delay elements associated with the I/O terminal. The memory is encoded with delay information. The I/O delay control logic is configured to initialize the propagation delay associated with each of the I/O terminals by selecting which of the delay elements are to be applied to produce the propagation delay based on the delay information stored in the memory.

主权项

1. An integrated circuit (IC), comprising:
a plurality of input/output (I/O) terminals through which signals pass into or out of the IC; and an I/O timing module configured to add propagation delay to signals passing between the I/O terminals and I/O subsystems of the IC, the I/O timing module comprising:
a plurality of delay elements associated with each of the I/O terminals;a control register associated with each of the I/O terminals and coupled to each of the delay elements associated with the I/O terminal, each control register storing selection data for selecting delay elements of the associated I/O terminal;a non-volatile memory encoded with delay information for each I/O terminal; andI/O delay control logic configured to initialize the propagation delay associated with each of the I/O terminals by
retrieving corresponding delay information from the non-volatile memory,determining which of the delay elements to enable in combination to produce the propagation delay, andwriting data to the associated control register for selecting which of the delay elements are to be applied to produce the determined propagation delay.