Implementing robust readback capture in a programmable integrated circuit

• Main Authors: Rajasekharan, Karthy, Lu, Weiguang, Zeng, Michelle E, Kumar, Subodh, Durairajan, Uma, Rahul, Kumar
• Format: Patent
• Language: English
• Published: 01.01.2019
• Subjects: BASIC ELECTRONIC CIRCUITRY; CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; INFORMATION STORAGE; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; PULSE TECHNIQUE; STATIC STORES; TESTING

In an example, a memory circuit in a programmable integrated circuit (IC) includes: a control port and a clock port; a configurable random access memory (RAM) having a control input and a clock input; input multiplexer logic coupled to the control input and the clock input; and a state machine coupled to the input multiplexer logic and configuration logic of the programmable IC, the state machine configured to: in response to being enabled by the configuration logic, control the input multiplexer logic to switch a connection of the control input from the control port to the state machine and, subsequently, switch a connection of the clock input from the clock port to a configuration clock source; and in response to being disabled by the configuration logic, control the input multiplexer logic to switch the connection of the clock input from the configuration clock source to the clock port and, subsequently, switch the connection of the control input from the state machine to the control port.