Posts: 1
Joined: Sun Jun 18, 2017 9:37 am

SMI - CS signal?

Sun Jun 18, 2017 10:06 am

I am currently trying to connect to a W5100 / wiz812mj to a Raspberry 3 by using the SMI.
The breakout board needs a /CS, /WR and /RD pin connected. In the alternative GPIO pinout 1 ( I can only find /OE and /WE, even tough a /CS signal is mentioned in the device tree overlay for SMI.
How can I "create" a CS-Signal? Is there a possibility to define it in a DT-overlay?

Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 2416
Joined: Thu Jul 11, 2013 2:37 pm

Re: SMI - CS signal?

Mon Jun 19, 2017 12:14 pm

The SMI "cs" pins are the address pins SA0-SA5. Transfers are tied to an address which is output when the bus is active, so depending on your "active" state you need to make sure your address has the connected bit set or cleared.
Rockets are loud.

Posts: 8
Joined: Wed May 29, 2013 11:06 am

Re: SMI - CS signal?

Sun May 12, 2019 8:53 pm

can anyone provide SMI (secondary mamory interface) hardware specification? I trying to do something similar

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