FT2232D Datasheet, PDF (29/56 Pages) Future Technology Devices International Ltd. – Dual USB UART/FIFO I.C.

FT2232D Dual USB UART / FIFO I.C.
9.0 Signal Descriptions By IO Mode and Interface Channel Configurations
9.1 232 UART Interface Mode Signal Descriptions and Interface Configurations
When either Channel A or Channel B are in 232 UART mode the IO signal lines are configured as follows:-
Pin#
Channel A Channel B
24
40
23
39
22
38
21
37
20
36
19
35
17
33
16
32
15
30
13
29
12
28
11
27
10
26
Signal Type
Description
TXD
RXD
RTS#
CTS#
DTR#
DSR#
DCD#
RI#
TXDEN
SLEEP#
RXLED#
TXLED#
SI/WU
OUTPUT
INPUT
OUTPUT
INPUT
OUTPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
O.C.
O.C
INPUT
Transmit Asynchronous Data Output
Receive Asynchronous Data Input **Note 16
Request To Send Control Output / Handshake signal
Clear To Send Control Input / Handshake signal **Note 16
Data Terminal Ready Control Output / Handshake signal
Data Set Ready Control Input / Handshake signal **Note 16
Data Carrier Detect Control Input **Note 16
Ring Indicator Control Input. When the Remote Wake up option
is enabled in the EEPROM, taking RI# low can be used to
resume the PC USB Host controller from suspend. **Note 16
Enable Transmit Data for RS485
Goes low during USB Suspend Mode. Typically used to power-
down an external TTL to RS232 level converter I.C. in USB to
RS232 converter designs.
LED Drive - Pulses Low when Transmitting Data via USB.
LED Drive - Pulses Low when Receiving Data via USB.
The Send Immediate / WakeUp signal combines two functions
on a single pin. If USB is in suspend mode (PWREN# = 1) and
remote wakeup is enabled in the EEPROM , strobing this pin
low will cause the device to request a resume on the USB Bus.
Normally, this can be used to wake up the Host PC.
During normal operation (PWREN# = 0), if this pin is strobed low
any data in the device TX buffer will be sent out over USB on the
next Bulk-IN request from the drivers regardless of the pending
packet size. This can be used to optimise USB transfer speed for
some applications. Tie this pin to VCCIO if not used.
**Note 16 : These pins are pulled to up VCCIO via internal 200K resistors during Reset and USB Suspend mode.
These can be programmed to gently pull low during USB suspend ( PWREN# = “1” ) by setting this option in the
EEPROM.
DS2232D Version 0.91
© Future Technology Devices International Ltd. 2006 Page 29 of 51