FT4232HL-1000 FTDI [Future Technology Devices International Ltd.], FT4232HL-1000 Datasheet - Page 23

• Manufacturer Part Number: FT4232HL-1000
• Description: QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC
• Manufacturer: FTDI [Future Technology Devices International Ltd.]

Figure 4.7 Synchronous Bit-Bang Mode Timing Interface Example
It should be noted that the FT4232H does not output the WRSTB# or RDSTB# signals when configured in
bit-bang mode. Figure 4.7. and Table 4.2 show these signals for illustration purposes only.
Table 4.2 Synchronous Bit-Bang Mode Timing Interface Example Timings
WRSTB# = this output indicates when new data has been written to the I/O pins from the Host PC (via
the USB interface).
RDSTB# = this output rising edge indicates when data has been read from the I/O pins and sent to the
Host PC (via the USB interface).
NAME
t1
t2
t3
t4
t5
t6
WRSTB#
RDSTB#
Description
Current pin state is read
RDSTB# is set inactive and data on the paralle I/O pins is read and sent to the USB host.
RDSTB# is set active again, and any pins that are output will change to their new data
1 clock cycle to allow for data setup
WRSTB# goes active. This indicates that the host PC has written new data to the I/O parallel data
pins
WRSTB# goes inactive
Copyright © 2010 Future Technology Devices International Limited
FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC
Document No.: FT_000060
Clearance No.: FTDI#78
Datasheet Version 2.09
23