User guide

CY7C68013A, CY7C68014A
CY7C68015A, CY7C68016A
Document Number: 38-08032 Rev. *X Page 67 of 71
Errata
This section describes the errata for the EZ-USB
®
FX2LP™ CY7C68013A/14A/15A/16A Rev. B silicon. Details include errata trigger
conditions, scope of impact, available workaround, and silicon revision applicability.
Contact your local Cypress Sales Representative if you have questions.
Part Numbers Affected
CY7C68013A/14A/15A/16A Qualification Status
In production
CY7C68013A/14A/15A/16A Errata Summary
This table defines the errata for available CY7C68013A/14A/15A/16A family devices. An "X" indicates that the errata pertain to the
selected device.
1. Empty Flag Assertion
■ Problem Definition
In Slave FIFO Asynchronous Word Wide mode, if a single word data is transferred from the USB host to EP2, configured as OUT
Endpoint (EP) in the first transaction, then the Empty flag behaves incorrectly. This does not happen if the data size is more than
one word in the first transaction.
■ Parameters Affected
NA
■ Trigger Condition(S)
In Slave FIFO Asynchronous Word Wide Mode, after firmware boot and initialization, EP2 OUT endpoint empty flag indicates the
status as ‘Empty’. When data is received in EP2, the status changes to ‘Not-Empty’. However, if data transferred to EP2 is a single
word, then asserting SLRD with FIFOADR pointing to any other endpoint changes ‘Not-Empty’ status to ‘Empty’ for EP2 even
though there is a word data (or it is untouched). This is noticed only when the single word is sent as the first transaction and not if
it follows a multi-word packet as the first transaction.
■ Scope of Impact
External interface does not see data available in EP2 OUT endpoint and can end up waiting for data to be read.
■ Workaround
One of the following workarounds can be used:
• Send a pulse signal to the SLWR pin, with FIFOADR pins pointing to an endpoint other than EP2, after firmware initialization
and before or after transferring the data to EP2 from the host
• Set the length of the first data to EP2 to be more than a word
• Prioritize EP2 read from the Master for multiple OUT EPs and single word write to EP2
• Write to an IN EP, if any, from the Master before reading from other OUT EPs (other than EP2) from the Master.
■ Fix Status
There is no silicon fix planned for this currently; use the workarounds provided.
Part Number Package Type Operating Range
CY7C68013A All Commercial
CY7C68014A All Commercial
CY7C68015A All Commercial
CY7C68016A All Commercial
Items CY7C68013A/14A/15A/16A Silicon Revision Fix Status
[1] Empty Flag Assertion X B No silicon fix planned currently. Use
the workaround