AN2647 datasheet(27/34 Pages) STMICROELECTRONICS

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AN2647 Datasheet(PDF) 27 Page - STMicroelectronics

Part #	AN2647

Description	Using the STR91xFA external memory interface

PDF	34 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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27 / 34 page

AN2647

Interfacing with synchronous memory

27/34

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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