ft232hq Future Technology Devices International Ltd., ft232hq Datasheet - Page 30

• Manufacturer Part Number: ft232hq
• Description: Ft232h Single Channel Hi- Speed Usb To Multipurpose Uart/fifo Ic
• Manufacturer: Future Technology Devices International Ltd.

4.5 FT245 Style Asynchronous FIFO Interface Mode Description
The FT232H can be configured as an asynchronous FIFO interface. This mode is similar to the
synchronous FIFO interface with the exception that the data is written to or read from the FIFO on the
falling edge of the WR or RD# signals.
This mode does not provide a CLKOUT signal and it does not expect an OE# input signal. The following
diagrams illustrate the asynchronous FIFO mode timing.
Figure 4.5 FT245 Asynchronous FIFO Interface READ Signal Waveforms
Figure 4.6 FT245 Asynchronous FIFO Interface WRITE Signal Waveforms
Table 4.2 Asynchronous FIFO Timings (based on standard drive level outputs)
Time
T10
T11
T1
T2
T3
T4
T5
T6
T7
T8
T9
RD# inactive to RXF#
RXF# inactive after RD# cycle
RD# to DATA
RD# active pulse width
RD# active after RXF#
WR# active to TXE# inactive
TXE# active to TXE# after WR# cycle
DATA to WR# active setup time
DATA hold time after WR# inactive
WR# active pulse width
WR# active after TXE#
Copyright © 2011 Future Technology Devices International Limited
FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC
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Document No.: FT_000288
Clearance No.: FTDI #199
Datasheet Version 1.0
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