FT2232L Dual USB UART / FIFO I.C.
Channel B
Pin Definitions by Chip Mode
**Note 2
Pin#
Generic
Pin
Name
232 UART 245 FIFO
Mode
Mode
Enhanced
Asynchronous
MPSSE
and
**Note 4
Synchronous
Bit-Bang Modes
D0
D1
D2
D3
D4
D5
D6
D7
WR#
**Note 9
RD#
**Note 9
WR#
**Note 7
RD#
**Note 7
SI/WUB
**Note 8
Fast
MCU
Opto-
Host Bus Isolated
Emulation Serial
Mode
Mode
**Note 5
A8
A9
A10
A11
A12
A13
A14
A15
CS#
ALE
RD#
WR#
**Note 8
SI/WUB
FSDI
FSCLK
FSDO
FSCTS
**Note 3
40
39
38
37
36
35
33
32
30
29
28
27
26
BDBUS0
BDBUS1
BDBUS2
BDBUS3
BDBUS4
BDBUS5
BDBUS6
BDBUS7
BCBUS0
BCBUS1
BCBUS2
BCBUS3
SI/WUB
TXD
RXD
RTS#
CTS#
DTR#
DSR#
DCD#
RI#
TXDEN
SLEEP#
RXLED#
TXLED#
SI/WUB
D0
D1
D2
D3
D4
D5
D6
D7
RXF#
TXE#
RD#
WR
SI/WUB
**Note 2 :
232 UART, 245 FIFO, CPU FIFO Interface, and Fast Opto-Isolated modes are enabled in the external
EEPROM. Enhanced Asynchronous and Synchronous Bit-Bang modes, MPSSE, and MCU Host Bus Emulation
modes are enabled using the driver command set bit mode. See Section 5.2 for details.
**Note 3 :
Channel A can be configured in another IO mode if channel B is in Fast Opto-Isolated Serial Mode. If both
Channel A and Channel B are in Fast Opto-Isolated Serial Mode all of the IO will be on Channel B.
**Note 4 :
MPSSE is Channel A only.
**Note 5 :
MCU Host Bus Emulation requires both Channels.
**Note 6 :
The Bit-Bang Mode (synchronous and asynchronous) WR# and RD# strobes are on these pins when the
main Channel mode is 245 FIFO, CPU FIFO interface, or Fast Opto-Isolated Serial Modes.
**Note 7 :
The Bit-Bang Mode (synchronous and asynchronous) WR# and RD# strobes are on these pins when the
main Channel mode is 232 UART Mode.
**Note 8 :
SI/WU is not available in these modes.
**Note 9 :
The Bit-Bang Mode (synchronous and asynchronous) WR# and RD# strobes are on these pins when the
main Channel mode is 245 FIFO, CPU FIFO interface. Bit-Bang mode is not available on Channel B when Fast Opto-
Isolated Serial Mode is enabled.
DS2232L Version 1.4
© Future Technology Devices International Ltd. 2005 Page 13 of 51
FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
