Latency when crossing pages or rows!

[SaAd_4646326]

It is mentioned that:

     4. A Row is a group of words relevant to the internal memory array structure and additional latency may be inserted by RWDS when crossing Row boundaries - this is

     device dependent behavior, refer to each HyperBus device data sheet for additional information. Also, the number of Rows may be used in the calculation of a

     distributed refresh interval for HyperRAM memory.

     5. A Page is a 16-word (32-byte) length and aligned unit of device internal read or write access and additional latency may be inserted by RWDS when crossing Page

     boundaries - this is device dependent behavior, refer to each HyperBus device data sheet for additional information.

What value of latency to use when crossing pages or rows?

Is this the initial latency before RD data out? or it is extra latency between rows or pages?

like RD data as:  [RD data of row1] [Latency] [RD data of row2]

[PradiptaB_11]

Hi

As the behavior you have mentioned is device dependent, can you specify which device you are using. Are you using hyper RAM or Hyper Flash device.

Thanks,

Pradipta.

[SaAd_4646326]

Hi, iam using the 64Mbit HyperRam

[SaAd_4646326]

Can you help?

[PradiptaB_11 · Accepted solution]

Hi

Q) What value of latency to use when crossing pages or rows?

Answer: No extra latency required for crossing row boundaries. If you have set the initial latency to fixed latency (2x) then row boundary latency is taken care internally also if you set the initial latency as variable latency, device will internally take care of the latency by driving the RWDS signal to low.

Q) Is this the initial latency before RD data out? or it is extra latency between rows or pages?

like RD data as:  [RD data of row1] [Latency] [RD data of row2]”

Answer: Yes, it’s the initial latency what is set by user.  It will be [INITIAL LATENCY ][RD data of row1] [RD data of row2]”

Thanks,

Pradipta.