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Driving REN1 and REN2 together for some families of synchronous FIFO's | Cypress

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Driving REN1 and REN2 together for some families of synchronous FIFO's

Last Updated: June 17, 2011
Question: 

- Can I drive /REN1 and /REN2 with the same signal?
- Can I tie Read Enable 1 and Read Enable 2 together?

Answer: 

 Both read enables can be driven together in some (E.g. CY7C42x1 and CY7C42x1V) families of synchronous FIFOs. Two read enable signals are provided to simplify depth expansion. In depth expansion, two FIFO's are used together to double the overall depth. Having two /REN signals allows the controller to switch between the two devices and control the flow of data. Otherwise, in standalone or width expansion mode, these two signals can be shared.

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