參數(shù)資料
型號(hào): FT-MOD-4232HUB
廠商: FTDI, Future Technology Devices International Ltd
文件頁(yè)數(shù): 14/45頁(yè)
文件大?。?/td> 0K
描述: MOD USB HS HUB & SERIAL I/F
標(biāo)準(zhǔn)包裝: 1
主要目的: 接口,USB 2.0 集線器
嵌入式:
已用 IC / 零件: FT4232H
主要屬性: USB 高速集線器,最多 3 下行 USB 端口
次要屬性: USB 供電
已供物品:
其它名稱: 768-1091
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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