How to connect HyperFlash with HyperRam in layout

[MaMe_3156226]

I want to use both - HyperRam ( S70KS1281DPBHI020 128Mb) and HyperFlash (S26KS512SDPBHI020 512Mb) on the same

HyperBus (using 2 different CSn lines).

Do you have any layout example?

I don't use Multi-Chip Package since it includes max RAM size of 64Mb..

Please advise,

Thanks,

Maor

[SudheeshK · Accepted solution]

Hi,

Please see our "HyperFlash™ and HyperRAM™ Layout Guid" at: https://www.cypress.com/documentation/application-notes/an211622-hyperflash-and-hyperram-layout-guid... .

Thanks and Regards,

Sudheesh

[MaMe_3156226]

The Layout guide (AN211622) doesn't mention  a connection of two devices in parallel.

I assume that the hyperBus signals are sensative to stubs and special care need to taken when routing them to two seperate devices.

Maor

[SudheeshK]

Hi,

There are no special considerations to connect a HyperFlash and a HyperRAM device on the same bus. We recommend you to,

1. Comply with the AN211622 recommendations for both chip layout.
2. Run simulations using the provided IBIS models for these two devices from Cypress. This will help avoid any issues with the impedance matching, signaling...
   

I have attached the IBIS model for the device for the device S70KS1281DPBHI020 with this response. You can download IBIS model for S26KS512SDPBHI020 from: https://www.cypress.com/ibis/s26ks512s-ibis?source=search&cat=software_tools

Thanks and Regards,

Sudheesh