Cypress CY7C68300C 用户手册

Document 001-05809 Rev. *A

Page 41 of 42

© Cypress Semiconductor Corporation, 2006. The information contained herein is subject  to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be
used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its
products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.

The AT2LP does not fully support IDE removable media
devices. Changes in media state are not reported to the
operating system so users are unable to eject/reinsert media
properly. This may result in lost or corrupted data. Note that
standard ATAPI optical drives and ATA CompactFlash-type
devices are not part of this group.

The size of the drive’s buffer can greatly affect the overall data
transfer performance. Care must be taken to ensure that

drives have large enough buffers to handle the flow of data to
and from it. The exact buffer size needed depends on a
number of variables, but a good rule of thumb is:

(aprox min buffer) = (data rate) * (seek time + rotation time + other)

where ’other’ may include things like the time required to
switch heads, power up a laser, etc. Drives with buffers that
are too small to handle the extra data may perform consid-
erably slower than expected.

Purchase of I

2

C™ components from Cypress or one of its sublicensed Associated Companies conveys a license under the Philips

I

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C Patent Rights to use these components in an I

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C system provided that the system conforms to the I

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C Standard Specification

as defined by Philips. Microsoft and Windows are registered trademarks of Microsoft Corporation. Apple and Mac OS are registered
trademarks of Apple Computer, Inc. EZ-USB AT2LP, EZ-USB AT2, EZ-USB FX2 and EZ-USB TX2 are trademarks, and EZ-USB
is a registered trademark of Cypress Semiconductor Corporation. All product and company names mentioned in this document
are the trademarks of their respective holders.