XRT4500 Datasheet, PDF (14/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

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PIN DESCRIPTIONS (CONT.)
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
PIN
Signal
#
29
TR6A
30
TR6B
DTE
MODE
DCDA
DCDB
DCE
MODE
DCDA
TYPE FUNCTION
I/O Transceiver # 6 Line Signal I/O Pin:
The exact function of this pin depends upon whether the
XRT4500 has been configured to operate in the DCE or DTE
Mode.
DTE Mode: Negative Polarity Input of DCD (Data Carrier
Detect) Signal:
This input pin (along with TR6B, pin 30) accepts the line signal,
from the remote terminal equipment, in either a Single-Ended or
Differential manner. This line signal is converted to CMOS level
signals and is outputted (to the local terminal equipment) via the
RX67D output pin (Pin 32).
DCDB
DCE Mode: Negative Polarity Output Signal (of DCD-Data
Carrier Detect) to the Line:
Transceiver 6 accepts TTL level binary data stream, via the
“TX67D” (pin 28) input pin. This output pin, along with “TR6B”
(pin 30) will output this data to the Remote Terminal Equipment).
via an Analog Line Signal.
I/O Transceiver #6 Line Signal I/O Pin
The exact function of this pin, depends upon whether the
XRT4500 has been configured to operate in the DCE or DTE
Mode.
DTE Mode: Receiver 6 – Positive Polarity Input of DCD (Data
Carrier Detect) Signal:
This input pin (along with TR6A, pin 29) accepts the line signal,
from the remote terminal equipment, in a Differential manner.
This line is converted to CMOS signal levels and is output (to the
local terminal equipment) via the RX67D output pin (Pin 32).
DCE Mode: Transmitter 6 – Positive Polarity Output of DCD
(Data Carrier Data Signal) Pin:
Transceiver 6 accepts a TTL level binary data stream, via the
TX67D (pin 28) input pin. This output pin (along with TR6A, pin
29) will output this data (to the remote terminal equipment) via
an Analog line signal.
NOTE: This I/O pin is not used if the XRT4500 has been config-
ured to operate in the V.28/EIA-232 Communications Interface
Mode.
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