Document Number: 38-08008 Rev. *H Page 33 of 39
Errata
This section describes the errata for the SL811HS. Details include errata trigger conditions, available workaround, and silicon revision
applicability.
Contact your local Cypress Sales Representative if you have questions.
Part Numbers Affected
SL811HS/SL811 Qualification Status
Product status: In production - Qual Report: 014401
SL811HS/SL811 Errata Summary
The following table defines the errata applicability to available SL811HS/SL811 family of devices.
Note Errata titles in this table are hyperlinked. Click an entry to go to its description.
1. Host Mode: SEO problem in low-speed hub operation
■ Problem Definition
Some hubs that send SE0s upstream during the EOF1 time frame may cause the SL811HS to stop sending SOFs. This problem
occurs when operating with low-speed devices attached downstream of such a hub. This is not a problem with full-speed devices.
According to the USB Specification, hubs are permitted to transmit SE0s during the EOF1 time frame. This is done to eliminate
potential babble conditions on the bus and is an optional feature implemented in some hubs.
■ Parameters Affected
SOFs
■ Trigger Condition(S)
Attaching hub that sends SE0s upstream during the EOF1 time frame.
■ Scope of Impact
The SL811HS can not host a low-speed device downstream of a hub that generates SE0s during EOF1.
■ Workaround
The only complete workaround is to use a hub that does not transmit SE0s upstream during EOF1. Some hubs, including all
Cypress hubs, have the option to disable SE0s from being generated during EOF1.
For a list of hubs that do not generate SE0s upstream during EOF1, or for more information on disabling this feature in Cypress
hubs, contact Cypress USB support.
■ Fix Status
Use workaround.
Part Number Package Type Operating Range
SL811HS All Commercial
Items SL811HS/SL811S Rev Letter/Number Fix Status
1. Host Mode: SE0 problem in low-speed hub operation X 1.5 Use workaround
2. Host Mode: Sync to SOF does not apply to low-speed mode X 1.5 Use workaround
3. Host/Peripheral Mode: 12 MHz operation with sensitive in-
ternal PLL
X 1.5 Use workaround
4. Peripheral Mode: Unreliable DMA interface X 1.5 Use workaround
5. Peripheral Mode: SL811HS can miss packets in a noisy
environment
X 1.5 Use workaround
6. Host/Peripheral Mode: Auto-increment feature results in
corrupt data
X 1.5 Use workaround
