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P A R A L L E L S I G N A L U S A G E D E S C R I P T I O N
GROUND
DB2 - FIFO Data Bus Bit 2
DB7 - FIFO Data Bus Bit 7
DB5 - FIFO Data Bus Bit 5
DB3 - FIFO Data Bus Bit 3
PWREN - Active low power-enable output.
PWREN# = 0: Normal operation.
PWREN# = 1: USB SUSPEND mode or device has not been configured.
This can be used by external circuitry to power down logic when device is in USB
suspend or has not been configured.
SIWUA -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 optimize USB transfer speed for some applications. Tie this pin to
VCCIO if not used.
EXTVCC - Use for applying main power (4.5 to 5.25 volts) to the module. Connect to
PORTVCC (Pin 9) if the module is to be powered by the USB port (typical configuration).
PORTVCC - Power from the USB port. Connect to EXTVCC (Pin 8) if the module is to
be powered by the USB port (typical configuration). 500mA is the maximum current
available to the USB adapter and target electronics if the USB device is configured for
high power.
GROUND
RD# - When pulled low, RD# takes the 8 data lines from a high-impedance state to the
current byte in the FIFO’s buffer. Taking RD# high returns the data pins to a high-
impedance state and prepares the next byte (if available) in the FIFO to be read.
WR - When taken from a high to a low state, WR reads the 8 data lines and writes the
byte into the FIFO’s transmit buffer. Data written to the transmit buffer is sent to the host
PC within the TX buffer timeout value (default 16mS) and placed in the buffer that was
created when the USB port was opened. The FT245R allows the TX buffer timeout value
to be reprogrammed to a value between 1 and 255mS.
DB6 - FIFO Data Bus Bit 6
TXE# - When high, do not write data into the FIFO. When low, data can be written into
the FIFO by strobing WR high, then low. During reset this signal pin is tri-state. Data is
latched into the FIFO on the falling edge of the WR pin.
RXF# - When low, at least 1 byte is present in the FIFO’s receive buffer and is ready to
be read with RD#. RXF# goes high when the receive buffer is empty. During reset this
signal pin is tri-state. If the Remote Wakeup option is enabled in the internal EEPROM,
during USB Suspend Mode (PWREN#=1) RXF# becomes an input. This can be used to
wake up the USB host from Suspend Mode by strobing this pin low for a minimum of
20ms which will cause the device to request a resume on the USB bus.
DB1 - FIFO Data Bus Bit 1
DB4 - FIFO Data Bus Bit 4
DB0 - FIFO Data Bus Bit 0
Rev. 1.3 (December 2009)
8
? DLP Design, Inc.
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