This part is not recommended for new designs
Use CY7C68300B EZ-USB AT2LP™ USB2.0 to ATA/ATAPI
Bridge for new designs
CY7C68300A
Figure 8-2 is a plot of the solder mask pattern and Figure 8-3
is an X-Ray image of the assembly (darker areas indicate
solder.)
9.0
Other Design Considerations
Certain design considerations must be followed to ensure
proper operation of the CY7C68300A.
9.1
Proper Power-up Sequence
Power must be applied to the CY7C68300A before, or at the
same time as the ATA/ATAPI device. If power is supplied to the
drive first, the CY7C68300A will start up in an undefined state.
Designs that utilize separate power supplies for the
CY7C68300A and the ATA/ATAPI device are not recom-
mended.
Figure 8-2. Plot of the Solder Mask (White Area)
9.2
IDE Removable Media Devices
The CY7C68300A does not fully support IDE removable
media devices. Changes in media state are not reported to the
operating system so users will be unable to eject/reinsert
media properly. This may result in lost or corrupted data.
9.3
Devices With Small Buffers
The size of the ATA/ATAPI device’s buffer can greatly affect
the overall data transfer performance. Care should be taken to
ensure that devices have large enough buffers to handle the
flow of data to/from the drive. The exact buffer size needed
depends on a number of variables, but a good rule of thumb is:
Figure 8-3. X-ray Image of the Assembly
(aprox min buffer size) = (data rate) * (seek time + rota-
tion time + other)
where (other) may include things like time to switch heads,
power-up a laser, etc. Devices with buffers that are too small
to handle the extra data may perform considerably slower than
expected.
Document #: 38-08031 Rev. *E
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