i.MX21 EIM correct wait clocks

cancel
Showing results for 
Search instead for 
Did you mean: 

i.MX21 EIM correct wait clocks

Jump to solution
222 Views
norishinozaki
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)
0 Kudos
1 Solution
102 Views
igorpadykov
NXP TechSupport
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

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

Note: If this post answers your question, please click the Correct Answer button. Thank you!

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

View solution in original post

0 Kudos
5 Replies
103 Views
igorpadykov
NXP TechSupport
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

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

Note: If this post answers your question, please click the Correct Answer button. Thank you!

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

View solution in original post

0 Kudos
102 Views
norishinozaki
Contributor V

Hello Igor,

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

The below is the correct one.

pastedImage_0.png

Right?

Best regards,

Nori Shinozaki

0 Kudos
102 Views
igorpadykov
NXP TechSupport
NXP TechSupport

Hi Nori

yes this is right.

Best regards

igor

102 Views
norishinozaki
Contributor V

Igor,

Thanks!

Nor! Shinozaki

0 Kudos
102 Views
norishinozaki
Contributor V

Hello Igor,

Thanks!

Best regards,

Nori Shinozaki

0 Kudos