XRT4500 Datasheet, PDF (46/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

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XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
1.3 THE CONTROL BLOCK
The purpose of the Control Block is to permit the user
to configure the XRT4500 into a wide variety of oper-
ating modes. In particular, the Control Block permits
the user to implement the following configuration se-
lections for the XRT4500.
To select which Communication Interface Mode the
XRT4500 will operate in.
• To configure the XRT4500 to operate in either the
DTE or the DCE Mode.
• To optionally configure the XRT4500 to operate in a
Loop-back Mode.
• To enable or disable the “Echo-Clock” Mode.
• To optionally configure the XRT4500 to operate in
the “Latch” Mode.
• To optionally configure the XRT4500 to operate in
the “Register” Mode.
• To configure the XRT4500 to operate in either the
“2 Clock” or the “3-Clock” Mode.
• To enable or disable the Internal Oscillator (for DTE
Stand-Alone Diagnostic operation).
• To invert the TXC clock signal (for DCE applica-
tions) or the RXC clock signal (for DTE applica-
tions).
• To invert the TXD data (for DCE applications) or the
RXD data (for DTE applications).
FIGURE 15. DIAGRAM OF THE XRT4500 CONTROL BLOCK
The input pins shown in Figure 15, the Control Block,
are described in detail, below.
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