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S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

Document ID: PMC-1990267, Issue 3

Pin Name

Type

No.

Function

REF8KO

RPOHFP

RFPO

RMFPO

Output

U12

The Reference 8kHz Output (REF8KO) is an 8kHz

reference derived from the receive clock (RCLK). A free-

running divide-down counter is used to generate

REF8KO so it will not “glitch” on reframe actions.

REF8KO will pulse high for approximately one RCLK

cycle every 125 µs. REF8KO should be treated as a

“glitch-free” asynchronous signal.

The Receive PLCP Overhead Frame Position (RPOHFP)

locates the individual PLCP path overhead bits in the

receive overhead data stream, RPOH. RPOHFP is logic

one while bit 1 (the most significant bit) of the path user

channel octet (F1) is present in the RPOH stream.

RPOHFP is updated on the falling edge of RPOHCLK.

RPOHFP is available when the PLCPEN register bit is

logic one in the SPLR Configuration Register.

The Framer Receive Frame Pulse/Multi-frame Pulse

(RFPO/RMFPO) is valid when the S/UNI-JET is

configured to be in framer only mode. The 8KREFO bit

must be set to logic zero in the S/UNI-JET Configuration

RFPO is aligned to RDATO and indicates the position of

the first bit in each DS3 M-subframe, the first bit in each

G.751 E3 or G.832 E3 frame, or the first framing bit in

each J2 frame

RMFPO is aligned to RDATO and indicates the position

of the first bit in each DS3 M-frame, the first bit in each

G.751 or G.832 E3 multiframe, or the first framing bit in

each J2 multiframe.

RFPO/RMFPO is updated on either the falling or rising

edge of RSCLK depending on the setting of the RSCLKR

bit in the S/UNI-JET Receive Configuration Register.

RPOH

ROVRHD

Output

V13

The Receive PLCP Overhead Data (RPOH) contains the

PLCP path overhead octets (Zn, F1, B1, G1, M1, M2,

and C1) extracted from the received PLCP frame when

the PLCP layer is in-frame. When the PLCP layer is in

the LOF state, RPOH is forced to all ones. The octet data

on RPOH is shifted out in order from the most significant

bit (bit 1) to the least significant bit (bit 8).

RPOH is updated on the falling edge of RPOHCLK.

The Framer Receive Overhead Indication (ROVRHD) is

valid when the S/UNI-JET is configured as a DS3, E3, or

J2 framer for non-ATM applications by setting the

FRMRONLY bit in the S/UNI-JET Configuration 1

RDATO corresponds to an overhead bit position.

ROVRHD is updated on the either the falling or rising

edge of RSCLK depending on the setting of the RSCLKR

bit in the S/UNI-JET Receive Configuration Register.

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