[AM5728] Confirm the timing to get the data

Kaka

Hi TI Experts,

Please let me confirm the following question.

[Question]
When customer use the Asynchronous Single Read on an Address/Data-Nonmultiplexed Device, does AM572x get the read data at last clock rising timing? They would like to know the timing to get the read data.

If you have any questions, please let me know.
Best regards.
Kaka

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

Data is latched on the GPMC_nOE rising edge.

0 Kaka over 9 years ago in reply to Biser Gatchev-XID

Guru 24520 points

Hi Biser,

I got it.

Best regards.
Kaka

0 Kaka over 9 years ago in reply to Kaka

Guru 24520 points

Hi Biser,

I got more question from my customer.
According to the TRM on page 3359, it is said as below.
> Read data is latched at GPMC_CONFIG1_5[20:16] RDACCESSTIME completion time.
But you said that "Data is latched on the GPMC_nOE rising edge.".
Which timing is correct?

In case of using page reading operation on page 3361 in TRM, it seems that the read data is lacched at RDACCESSTIME completion time.
How do you think?

Best regards.
Kaka

0 Biser Gatchev-XID over 9 years ago in reply to Kaka

TI__Guru**** 393215 points

Well, that's the same moment of time, actually.

0 Kaka over 9 years ago in reply to Biser Gatchev-XID

Guru 24520 points

Hi Biser,

How about the page mode on page 3361?
It seems that there is difference on the latch timing.

Best regards.
Kaka

0 Biser Gatchev-XID over 9 years ago in reply to Kaka

TI__Guru**** 393215 points

Let's get clear. What mode of operation are you asking about? Behavior is different for single access and burst access.

0 Kaka over 9 years ago in reply to Biser Gatchev-XID

Guru 24520 points

Hi Biser,

Now we would like to know about the operation of Page mode(burst access mode).
*** In my understanding, the page mode is equaled to burst mode, right?

Best regards.
Kaka

0 Biser Gatchev-XID over 9 years ago in reply to Kaka

TI__Guru**** 393215 points

Yes, this is correct. Data is latched at RDACCESSTIME, then at each PAGEBURSTACCESSTIME. If you need precise timings you should refer to section 7.10 in the AM572X Datasheet SR2.0.

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[AM5728] Confirm the timing to get the data