RM0319 datasheet(108/368 Pages) STMICROELECTRONICS

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External memory interface (EMI)

RM0319

108/368

Doc ID 022640 Rev 3

EMI read without acknowledgement signal (EMI_WAIT#)

Figure 29.

EMI read (without ACK)

This timing diagram indicates a typical EMI read cycle. Acknowledgement signal

(EMI_WAIT#) is ignored in this case. It also indicates the registers which affect the timing

duration of the different interface signals.

EMI read with acknowledgement signal (EMI_WAIT#)

Figure 30.

EMI read (with ACK)

This timing diagram indicates a typical EMI read cycle in which the Acknowledgement signal

(EMI_WAIT#) is considered. It also indicates the registers which affect the timing duration of

the different interface signals

9.4

Programming examples

Example 1: A 16-bit peripheral which does not use byte lane procedure is connected with

EMI. The peripheral does not provide the acknowledgement signal. We want to perform

read and write to it. The peripheral is connected to CS0.

READ DATA

BE ADDR

EMI_ADB

EMI_ADDLE

EMI_CE#

EMI_OE#

tSDP

tAP

tDPr

tDCS

READ DATA

BE ADDR

EMI_ADB

EMI_ADDLE

EMI_CE#

EMI_OE#

tSDP

tAP

tDPr

tDCS

EMI_WAIT#

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