PM7347 datasheet(88/341 Pages) PMC

88 / 341 page

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

TICLK

The TICLK bit selects the transmit clock used to update the TPOS/TDATO and

TNEG/TOHM outputs. When a logic zero is written to TICLK, the buffered version of the

input transmit clock, TCLK, is used to update TPOS/TDATO and TNEG/TOHM on the edge

selected by the TCLKINV bit. When a logic one is written to TICLK, TPOS/TDATO and

TNEG/TOHM are updated on the rising edge of TICLK, eliminating the flow-through TCLK

signal. The TICLK bit has no effect if the LOOPT, LLOOP, or PLOOP bit is a logic one.

TXREF

The TXREF register bit determines if TICLK[1] and TIOHM/TFPI/TMFPI[1] should be used

as the reference transmit clock and overhead/frame pulse, respectively, instead of TICLK and

TIOHM/TFPI/TMFPI. If TXREF is set to a logic one, then TICLK[1] and

TIOHM/TFPI/TMFPI[1] will be used as the reference transmit clock and overhead/frame

pulse, respectively. If TXREF is set to a logic zero, then TICLK and TIOHM/TFPI/TMFPI

will be used as the reference transmit clock and overhead/frame pulse, respectively, for

quadrant X. If loop-timing is enabled (LOOPT = 1), the TXREF bit has no effect on the

corresponding quadrant. Note: When TXREF is set to logic one, the unused TICLK and

TIOHM/TFPI/TMFPI should be tied to power or ground, not left floating.

TFRM[1:0]

The TFRM[1:0] bits determine the frame structure of the transmitted signal. Refer to Table 8:

Table 8 TFRM[1:0] Transmit Frame Structure Configurations

TFRM[1:0]

Transmit Frame Structure

DS3 (C-bit parity or M23 depending on the setting of the CBIT bit in the DS3

TRAN Configuration Register)

E3 (G.751 or G.832 depending on the setting of the FORMAT[1:0] bits in the

E3 TRAN Framing Options Register)

J2 (G.704 and NTT compliant framing format)

DS1/E1/Arbitrary framing format - If the EXT bit in the SPLT Configuration

selected (via the PLCPEN and FORM[1:0] bits in the SPLT Configuration

arbitrary framing format is selected and overhead positions are indicated by

the TIOHM input pin.

PM7347 Datasheet(PDF) 88 Page - PMC-Sierra, Inc