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FT4232H Scheda tecnica(PDF) 21 Page - Future Technology Devices International Ltd.

Il numero della parte FT4232H
Spiegazioni elettronici  Quad High Speed USB to Multipurpose UART/MPSSE IC
PDF  45 Pages
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Produttore elettronici  FTDI [Future Technology Devices International Ltd.]
Homepage  http://www.ftdichip.com
Logo FTDI - Future Technology Devices International Ltd.

FT4232H Scheda tecnica(HTML) 21 Page - Future Technology Devices International Ltd.

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Copyright © 2010 Future Technology Devices International Limited
21
Document No.: FT_000060
FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC
Datasheet Version 2.2
Clearance No.: FTDI#78
4.4.1 MPSSE Adaptive Clocking
Adaptive clocking is a new MPSSE feature added to the FT24232H MPSSE engine.
The mode is effectively handshaking the CLK signal with a return clock RTCK. This is a technique used by
ARM processors.
The FT4232H will assert the CLK line and wait for the RTCK to be returned from the target device to
GPIOL3 line before changing the TDO (data out line).
FT4232H
ARM CPU
RTCK
TCK
TDO
GPIOL3
Figure 4.5 Adaptive Clocking Interconnect
TDO
TCK
RTCK
TDO changes on falling
edge of TCK
Figure 4.6: Adaptive Clocking waveform.
Adaptive clocking is not enabled by default.
See: AN_108 Command Processor for MPSSE and MCU Host Bus Emulation Modes.



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