XRT4500CV datasheet(46/99 Pages) EXAR

46 / 99 page

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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).

The input pins shown in Figure 15, the Control Block,

are described in detail, below.

FIGURE 15. DIAGRAM OF THE XRT4500 CONTROL BLOCK

XRT4500CV Datasheet(PDF) 46 Page - Exar Corporation