Recommended Configuration for RWDS Pin in HyperBus Memory - KBA224897
- Subscribe to RSS Feed
- Mark as New
- Mark as Read
- Bookmark
- Subscribe
- Printer Friendly Page
- Report Inappropriate Content
Author: TakahiroK_16 Version: **
Translation - Japanese: https://community.cypress.com/docs/DOC-20313
Question:
What is the recommended configuration for the RWDS pin in HyperBus memory?
Answer:
Weak pull-down is recommended for the RWDS pin in HyperBus memory.
The RWDS is used as a source for synchronous read Data Strobe (DS), an input signal (clock) for the host controller. In general, you should not leave input signals floating to prevent unknown or intermediate state of input signals. For the RWDS pin, weak pull-down is recommended. The memory stops driving the RWDS pin at logical low state at the end of the operation (Figure 1). Weak pull-down can keep the RWDS pin at logical low state until the next operation begins. Figure 2 and Figure 3 compare the weak pull-down and weak pull-up in back-to-back read operation case.
Figure 1. HyperBus Read Operation
Figure 2. Back-to-Back Read Operations – Weak Pull-Down for RWDS
Figure 3. Back-to-Back Read Operations – Weak Pull-Up for RWDS
- Tags:
- hyperbus
- hyperflash
- hyperram
- pull down
- pull up
- rds
- rwds
- s26hl-t
- s26hlhs semper flash with hyperbus interface
- s26hs-t
- s26kl-s
- s26klks hyperflash memory
- s26ks-s
- s27kl
- s27klks hyperram
- s27ks
- s70kl
- s70ks