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SP508CB Datasheet(PDF) 7 Page - Sipex Corporation |
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SP508CB Datasheet(HTML) 7 Page - Sipex Corporation |
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7 / 10 page  rev. 7/7/03 SP508 Evaluation Board Manual © Copyright 2003 Sipex Corporation 7 Driver Receiver Remote Loopback. The following example uses the ST driver looped back into the TxC receiver, using the 3 bit decoder configure the SP508 for the desired protocol. Connect a jumper cable between the ST(a) pin and the TxC(a) pin. If your mode select is for a differential driver/ receiver, then also connect a jumper cable between the ST(b) pin and the TxC(b) pin. next connect a signal generator to the ST input pin. The signal generator output must be a TTL-level output at a frequency within the acceptable range of the driver mode under test. Be sure that the STEN and the TxCEN DIP switches are set to enable the ST driver and TxC receiver and that the DIP switches tying the ST driver to the TxC receiver are off (refer to section 5.0 Dip switch guide). The driver outputs are now connected back to the receiver inputs so that the driver input to receiver output can be examined. This configuration is similar for the other drivers. Driver Receiver Local Loopback The SP508 has the ability to provide an internal loopback. This feature is invoked by a logic “0” on the LOOPBACK pin. The driver input and receiver output characteris- tics adhere to the appropriate specifications outlined in the data sheet under loopback conditions. The LOOPBACK pin has in in- ternal pull-up resistor so that the SP508 defaults to normal operation during power- up or if the pin is left floating. DCE DTE selectable configuration • Configure the decoder for the desired mode. • The SP508 evaluation board has dip switches setup to allow for the evaluation of a selectable DCE DTE configuration. • Switch the STEN and RRCEN to the ON position. This will disable the ST and RRC driver outputs. (Refer to the DIP switch guide on Page 8) • Switch the <TxCEN> and <RRTEN> switches to the ON position. This will dis- able the TxC and RRT receiver inputs. (Refer to the DIP switch guide on Page 8) • Switch the ST(A), ST(B), TxC(A), and TxC(B) switches to the ON position. This ties the ST driver outputs to the TxC Re- ceiver inputs. • Switch the RRC(A), RRC(B), RRT(A), and RRT(B) switches to the ON position. This ties the RRC driver outputs to the RRC receiver inputs. • To enable a DTE configuration switch the STEN and RRCEN switch to the OFF position. Be sure the TxC and RRT receiv- ers are disabled by switching the TxCEN and RRTEN switches to the ON position. (Refer to the DIP switch guide on Page 8) • To enable a DCE configuration switch the TxCEN and RRTEN to the OFF position. Be sure to disable the ST and RRC driver outputs by switching the STEN and RRCEN switches to the ON position. (Refer to the DIP switch guide on Page 8) System Level Evaluation • The DB-25 Connect if configured as a DTE for EIA-530 pinout. In order to connect other DCE equipment or network analyz- ers ( i.e. the TTC Firebird 6000A), the RxC receiver output must looped back into the TxCE driver input. The RxD output can also be looped back to the TxD input. • If connecting the evaluation board to a microcontroller such as the Motorola MC68360, jumper wires of the driver in- puts and receiver outputs must connect to the µC’s appropriate pins. USING THE EVALUATION BOARD: continued |
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