## i.MX21 EIM correct wait clocks

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## i.MX21 EIM correct wait clocks

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Contributor V

Hello,

I would like to determine wait cycles in EIM in i.MX21.

I'm setting WWS=0, WSC=111110 checking with MC9328MX21RM Rev.3, however it's not clear which is correct clocks, 63 or 62.

In the RM,

Table 20-6. 63 clocks: "WSC=111110 results in 63 clock transfers"

Table 20-7. 62 clocks: "WSC=111110 WWS=0 Read Access 62"

In the 20-7, 63 is Reserved so 62 is the corrcect clocks?

Best regards,

Nori Shinozaki

Tags (4)
1 Solution
104 Views
NXP TechSupport

Hi Nori

correct description is given in  Table 20-6 :

"WSC=111110 results in 63 clock transfers",

that is WSC encoded data results in +1 number of wait-states:

WSC = 000001 results in 2 clock transfers

WSC = 001110 results in 15 clock transfers

WSC = 111110 results in 63 clock transfers

MC9328MX21 3.19.1 EIM External Bus Timing Diagrams

gives examples.

Best regards

igor

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5 Replies
105 Views
NXP TechSupport

Hi Nori

correct description is given in  Table 20-6 :

"WSC=111110 results in 63 clock transfers",

that is WSC encoded data results in +1 number of wait-states:

WSC = 000001 results in 2 clock transfers

WSC = 001110 results in 15 clock transfers

WSC = 111110 results in 63 clock transfers

MC9328MX21 3.19.1 EIM External Bus Timing Diagrams

gives examples.

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

-----------------------------------------------------------------------------------------------------------------------

104 Views
Contributor V

Hello Igor,

Let me confirm, you mean the table value is typo.

The below is the correct one.

Right?

Best regards,

Nori Shinozaki

104 Views
NXP TechSupport

Hi Nori

yes this is right.

Best regards

igor

104 Views
Contributor V

Igor,

Thanks!

Nor! Shinozaki

104 Views
Contributor V

Hello Igor,

Thanks!

Best regards,

Nori Shinozaki