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AN2647 Datasheet(PDF) 27 Page - STMicroelectronics

No. de pieza AN2647
Descripción Electrónicos  Using the STR91xFA external memory interface
PDF  34 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2647 Datasheet(HTML) 27 Page - STMicroelectronics

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AN2647
Interfacing with synchronous memory
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EMI read and write asynchronous bus cycle
The EMI configurations in Table 8 will generate the write and read timing as shown in
Figure 14. The EMI_ALE signal, which indicates the start of a bus cycle, is connected to the
ADV# pin. The MT45W4M latches the address "33h" at the rising edge of EMI_ALE, and
then latches the write data "CDh" at the rising edge of EMI_WEn. Please note the
MT45W4M ignores the inputs on its address pins after the address latching. This allows the
EMI to take over the AD bus and drive the data "CDh".
Figure 14.
EMI bus write and read bus cycles in asynchronous mode
Note:
For your reference an asynchronous software example is delivered with this application
note.



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