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D4 -REMOTE LOOPBACK ENABLE:
When set (logic 1), this bit allows the DTE to test the transmission path up to and through
the remote DCE to the DTE interface and the similar return transmission path. When cleared
(logic 0), no testing occurs. If jumper J7 is in place the Remote Loopback is also used to control
the Sync input of the Channel A data receiver. This is useful in situations where it is desired to
receive unformatted serial data.
D3 -RECEIVE CLOCK ENABLE (DCE only):
When set (logic 1), this bit allows the DCE to transmit its Receive Clock (RCLK). When
cleared (logic 0), the DCE receives RCLK. Since a DTE can only receive RCLK, writing to this
bit has no effect on a DTE.
D2 -TRANSMIT CLOCK ENABLE (DTE only):
When set (logic 1), this bit allows the DTE to transmit its Transmit Clock (TCLK). When
cleared (logic 0), the DTE receives TCLK. Since a DCE can only transmit its TCLK, writing to
this bit has no effect on a DCE.
D1 RESERVED:
This bit should always be programmed to 0.
D0 RESERVED:
This bit should always be programmed to 0.
MPA-100 User's Manual 9-2