Parallel control port pins, Arallel, Ontrol – Rainbow Electronics DS21458 User Manual
Page 24: 3 parallel control port pins
DS21455/DS21458 Quad T1/E1/J1 Transceivers
24 of 270
Signal Name:
BPCLK
Signal Description:
Backplane Clock
Signal Type:
Output
A user-selectable synthesized clock output that is referenced to the clock that is output at the RCLK pin.
Signal Name:
RPOSO
Signal Description:
Receive Positive-Data Output
Signal Type:
Output
Updated on the rising edge of RCLKO with bipolar data out of the line interface. This pin is normally tied to RPOSI.
Signal Name:
RNEGO
Signal Description:
Receive Negative-Data Output
Signal Type:
Output
Updated on the rising edge of RCLKO with the bipolar data out of the line interface. This pin is normally tied to RNEGI.
Signal Name:
RCLKO
Signal Description:
Receive Clock Output
Signal Type:
Output
Buffered recovered clock from the network. This pin is normally tied to RCLKI.
Signal Name:
RPOSI (DS21455 Only)
Signal Description:
Receive Positive Data Input
Signal Type:
Input
Sampled on the falling edge of RCLKI for data to be clocked through the receive-side framer. RPOSI and RNEGI can be tied
together for a NRZ interface. Can be internally connected to RPOSO by tying the LIUC/TPD pin high. See the LIUC/TPD pin
description for a full explanation of the LIUC/TPD function.
Signal Name:
RNEGI (DS21455 Only)
Signal Description:
Receive Negative Data Input
Signal Type:
Input
Sampled on the falling edge of RCLKI for data to be clocked through the receive-side framer. RPOSI and RNEGI can be tied
together for a NRZ interface. Can be internally connected to RNEGO by tying the LIUC/TPD pin high. See the LIUC/TPD pin
description for a full explanation of the LIUC/TPD function.
Signal Name:
RCLKI (DS21455 Only)
Signal Description:
Receive Clock Input
Signal Type:
Input
Clock used to clock data through the receive-side framer. This pin is normally tied to RCLKO. Can be internally connected to
RCLKO by tying the LIUC/TPD pin high. See the LIUC/TPD pin description for a full explanation of the LIUC/TPD function.
5.3 Parallel Control Port Pins
Signal Name:
INT
Signal Description:
Interrupt
Signal Type:
Output
Flags host controller during events, alarms, and conditions defined in the status registers. Active-low open-drain output.
Signal Name:
TSTRST
Signal Description:
Tri-State Control and Device Reset
Signal Type:
Input
A dual-function pin. A zero-to-one transition issues a hardware reset to the DS21455/DS21458 register set. A reset clears all
configuration registers. Configuration register contents are set to zero. Leaving TSTRST high will tri-state all output and I/O
pins (including the parallel control port). Set low for normal operation. Useful in board-level testing.