About SSI Receiver Timing with external clock.

cancel
Showing results for 
Search instead for 
Did you mean: 

About SSI Receiver Timing with external clock.

Jump to solution
185 Views
takayuki_ishii
Contributor III

Hello community,

 

I have a question about fall edge hold timing of FS in slave mode SSI.

In Figure 93. of datasheet IMX6DQPAEC rev3, Hold time of falling edge of AUDx_TXFS are defined

as more than 10ns from AUDx_RXC high to AUDx_TXFS low(SS30 and SS34 of Table 85).

In this time, AUDx_TXFS and AUDx_RXD of Master device are transition by rise edge of AUDx_RXC.

And Slave device will be latched each signals by falling edge of AUDx_RXC.

SSI_MasterSlave.bmp

If so, SS30 and SS34 of Table85, It is difficult to keep 10ns as hold time because it is transition timing.

Is it correct to define SS30 and SS34 as "AUDx_RXC high to AUDx_TXFS  low"?

 

I think that it should be define as a transition timing like SS28 or SS32 or

a hold time of AUDx_TXFS, it must define from falling edge of AUDx_RXC like a SS41.

SSI_HoldOrTransition.bmp

 

I hope I can hear from you soon.

Best regards,

Ishii.

0 Kudos
1 Solution
176 Views
igorpadykov
NXP TechSupport
NXP TechSupport

Hi Ishii

 

>in Figure 93. of datasheet IMX6DQPAEC rev3, Hold time of falling edge of AUDx_TXFS are defined
>as more than 10ns from AUDx_RXC high to AUDx_TXFS low(SS30 and SS34 of Table 85)...
>.. think that it should be define as a transition timing like SS28 or SS32

regarding your notes you are right, SS30 and SS34 timings should be depicted
as transition timing like SS28 or SS32.

 

Best regards
igor

View solution in original post

0 Kudos
4 Replies
177 Views
igorpadykov
NXP TechSupport
NXP TechSupport

Hi Ishii

 

>in Figure 93. of datasheet IMX6DQPAEC rev3, Hold time of falling edge of AUDx_TXFS are defined
>as more than 10ns from AUDx_RXC high to AUDx_TXFS low(SS30 and SS34 of Table 85)...
>.. think that it should be define as a transition timing like SS28 or SS32

regarding your notes you are right, SS30 and SS34 timings should be depicted
as transition timing like SS28 or SS32.

 

Best regards
igor

View solution in original post

0 Kudos
169 Views
takayuki_ishii
Contributor III

Hello Igor,

 

Thank you for your quick response.

Before update datasheet, is it ok to design SS30 and SS34 specification are not 10ns(min),

but same as SS28 and SS32(min=-10ns, max=15ns)?

 

Best regards,

Ishii.

 

0 Kudos
161 Views
igorpadykov
NXP TechSupport
NXP TechSupport

Hi Ishii

 

I think yes.

 

Best regards
igor

0 Kudos
151 Views
takayuki_ishii
Contributor III

Hello Igor,

 

Thank you for your response.

I will inform this answer to my customer.

 

Best regards,

Ishi.

 

0 Kudos