PM5347 datasheet(64/302 Pages) PMC

64 / 302 page

PM5347 S/UNI-PLUS

DATA SHEET

PMC-941033

ISSUE 6

SATURN USER NETWORK INTERFACE PLUS

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

Pointer Interpreter

The Pointer Interpreter Block interprets the incoming pointer (H1, H2) as

specified in the references. The pointer value is used to determine the location of

the path overhead in the receive stream. The algorithm can be modeled by a

finite state machine. Within the pointer interpretation algorithm, three states are

defined as shown in Figure 4:

NORM_state (NORM)

AIS_state (AIS)

LOP_state (LOP)

The transition between states will be consecutive events (indications), e.g., three

consecutive AIS indications to go from the NORM_state to the AIS_state. The

kind and number of consecutive indications activating a transition is chosen such

that the behavior is stable and insensitive to low BER. The only transition on a

single event is the one from the AIS_state to the NORM_state after receiving a

NDF enabled with a valid pointer value. It should be noted that, since the

algorithm only contains transitions based on consecutive indications, this implies

that, for example, non-consecutively received invalid indications do not activate

the transitions to the LOP_state.

The following events (indications) are defined:

norm_point :

disabled NDF + ss + offset value equal to active offset

NDF_enable:

enabled NDF + ss + offset value in range of 0 to 782

AIS_ind:

H1 = 'hFF, H2 = 'hFF

inc_ind:

disabled NDF + ss + majority of I bits inverted + no majority

of D bits inverted + previous NDF_enable, inc_ind or

dec_ind more than 3 frames ago

dec_ind:

disabled NDF + ss + majority of D bits inverted + no majority

of I bits inverted + previous NDF_enable, inc_ind or dec_ind

more than 3 frames ago

inv_point:

not any of above (i.e., not norm_point, and not NDF_enable,

and not AIS_ind, and not inc_ind and not dec_ind)

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