FT4232H datasheet(22/43 Pages) FTDI

22 / 43 page

Document No.: FT_000060

FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC

Datasheet Version 2.05

Clearance No.: FTDI#78

Figure 4.5 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 4.5. and Table 4.2 show these signals for illustration purposes only.

NAME

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

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).

FT4232H Datasheet(PDF) 22 Page - Future Technology Devices International Ltd.