S29AL016J70BFI010_Behavior when an oscillation signal is input

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noha_3407421
Level 3
Level 3
Distributor - TED (Japan)
First like received 10 replies posted 10 questions asked

*Introduction

- The duration of oscillation is several hundred ns to several us.

- The frequency at the time of oscillation is not fixed.

- Suppose you are oscillating without meeting the flash ROM input setup and hold time.

- Assume that the voltage amplitude is within the guaranteed input voltage of Flash/CPU.

Q1.

Is it possible that the flash ROM device could be damaged by the input of the oscillation signal?

Q2.

We believe that the behavior of the device will be indeterminate during oscillation signal input.

If the reset low pulse specified in the device specifications is input after the oscillation signal is input, will it operate normally after reset is released?

Q3.

Is there any possibility that the data written by the oscillation signal input will be corrupted?

Best Regards,

Harukawa

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CYPRESS製Flash ROM S29AL016J70BFI010 に関して確認ございます。

上記デバイスのRESET入力(B4pin)に、発振信号が入力された場合の挙動について確認があります。

*発振信号

- 発振の継続期間は数100ns~数μs期間とします。

- 発振時の周波数が決まっているわけではありません。

- Flash ROMの入力セットアップ・ホールド時間を満たしていない状態で発振しているとします。

- 電圧振幅はFlash/CPUの入力保証電圧内であるとします。

Q1.

発振信号の入力によりFlash ROMデバイスが損傷する可能性はあるでしょうか。

Q2.

発振信号入力中はデバイスの挙動は不確定になると考えますが、

発振信号入力の後、デバイス仕様で既定されているリセット Lowパルスが入力される場合、リセット解除後は正常動作になると考えてよいでしょうか。

発振信号入力によりデバイスが異常状態となり、リセット解除しても正常動作できなくなる可能性はあるでしょうか。

Q3.

発振信号入力により書き込まれているデータ化け等発生する可能性はあるでしょうか。

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1 Reply
SudheeshK
Moderator
Moderator
Moderator
250 sign-ins First question asked 750 replies posted

Hello,

Our device S29AL016J can withstand overshoot up to VCC+0.5V for 20ns and undershoot up to -0.5V for 20ns. If any of these specs (voltage or duration) are violated the device may get damaged. Please see note 44 on page 36 and figures 11 and 12 on page 37 for more details. Datasheet: https://www.cypress.com/file/217466/download .

To answer your queries, we need more information about the issue in your application. Please provide below details.

  1. What are the input signal on which you observe oscillations?
  2. Can you provide scope shots of the oscillations? It will give us a better understanding of this issue.
  3. When do you observe the oscillations on input signals.

Thanks and Regards,

Sudheesh

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