DLP-2232M-G DLP Design Inc, DLP-2232M-G Datasheet - Page 22

• Manufacturer Part Number: DLP-2232M-G
• Description: MODULE USB ADAPTER FOR FT2232D
• Manufacturer: DLP Design Inc

Specifications of DLP-2232M-G

• Main Purpose: Interface, USB 2.0 to UART (RS232) Bridge
• Embedded: No
• Utilized Ic / Part: FT2232D
• Primary Attributes: Full Speed USB to High-Speed UART
• Secondary Attributes: Royalty-Free Drivers, 2K EEPROM
• Interface Type: USB
• Data Bus Width: 8 bit
• Operating Supply Voltage: 4.35 V to 5.25 V
• Product: Interface Modules
• For Use With/related Products: FT2232D
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 813-1000

9.5 Enhanced Asynchronous Bit-Bang Mode
Enhanced Asynchronous Bit-Bang mode is the same as BM-style Bit-Bang mode, except
that the internal RD# and WR# strobes are now brought out of the DLP-2232M-G to
allow external logic to be clocked by accesses to the bit-bang IO bus.
On either or both channels, any data written to the device in the normal manner will be
self clocked onto the data pins (those which have been configured as outputs). Each pin
can be independently set as an input or an output. The baud rate generator controls the
rate at which the data is clocked out.
For the data to change there has to be new data written, and the baud rate clock has to
tick. If no new data is written to the channel, the pins will hold the last value written.
To allow time for the data to be setup and held around the WR# strobe, the baud rate
should be less than 1 MegaBaud.
Enabling
Asynchronous Bit-Bang mode is enabled by the Set Bit Bang Mode command:
Set_USB_Device_BitMode($00,$01) ; to enable it
Set_USB_Device_BitMode($00,$00) ; to reset it
9.6 Synchronous Bit-Bang Mode
With Synchronous Bit-Bang enabled, data will only be sent out by the FT2232D if there
is space in the device for data to come in. This Synchronous Bit-Bang mode will read the
data bus pins first, before it sends out the byte that has just been transmitted. It is
therefore 1 byte behind the output, and so to read the inputs for the byte that you have
just sent, another byte must be sent.
For example:
(1)
Pins start at 0xFF
Send 0x55,0xAA
Pins go to 0x55 and then to 0xAA
DS2232C Version 1.0 © Future Technology Devices Intl. Ltd. 2004 Page 40 of 52FT2232D Dual
USB UART / FIFO I.C.
Data read = 0xFF,0x55
Rev 1.6 (May 2009)
22
DLP-2232M-G DLP Design, Inc.