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We use a CY14B116M, the package is TSOP II. We operate the internal address space of MCU,without CE ,OE, , WE BLE and BHE, but its bus has a large number of data and address operation,then the HSB is low. We change the CY14B116M to CY14B108M is OK?
Is it different with these two chips?How can I use the CY14B116M?
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Why don't you use the CE ,OE, , WE BLE and BHE? You only connected HSB pin of CY14B116M to a MCU only?
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No,I connected all the signals to MCU,but I haven't operated the nvSRAM, the HSB is low.
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Can you share shematics of the nvSRAM portion with us.
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The HSB pin can go low either if it is externally pulled low or if there are glitches on the VCC pin. If the voltage at Vcc goes velow Vswitch level then the HSB is pulled low internally. Can you check if there are any glitches on the VCC pin. This can be a potential reason.
Thanks,
Pradipta.
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Are you observing HSB# low all the time or is it only at the power up?
Can you provide more details about how you are observing this issue?
Thanks and Regards,
Sudheesh
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We checked the details provided by you and we need some clarifications.
1. As per our understanding you have short circuited the HSB# pins of both 16Mb devices and connected to CPU_Wait pin. Is our understanding correct?
2. I did not understand how you replaced one of the 16Mb devices with 8Mb one. How are the HSB# pins connected when you replaced 16Mb with 8Mb? Are they still short circuited?
3. Where is the variable read_buffer located, is it stored in the nvSRAMs?
Thanks and Regards,
Sudheesh
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Hi,thank you very much for reply my question.
1.We have separated the HSB pins of each device by tilting the HSB pin and pulling it through the resistor,and break the connection with the CPU pin.
2.As the package of 16M chip is the same with the 8M one , we remove the 16M chip, soldering the 8M chip, and the HSB pins are separated.
3.The Variable read_buffer is stored in the internal storage space and is not stored in nvSRAM.
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Hi,
Can you please share with us the complete test code you are using. We will need to debug it to find the issue, as you stated in the test document also.
Thanks,
Pradipta.
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OK ,I will upload our test code,thank you!