PM7346 datasheet(139/419 Pages) PMC

139 / 419 page

PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 118

FIXSTUFF:

The FIXSTUFF bit controls the transmit PLCP frame octet/nibble stuffing

used for DS3 and G.751 E3 PLCP frame formats. When a logic 0 is written to

FIXSTUFF, stuffing is determined by the REF8KI input. When a logic 1 is

written to FIXSTUFF and the DS3 PLCP frame format is enabled, a nibble is

stuffed into the 13 nibble trailer twice every three stuff opportunities (i.e. 13,

14, 14 nibbles). This stuff ratio provides for a nominal PLCP frame rate of

125.0002366 µs (an error of 1.9 ppm). When the G.751 E3 PLCP frame

format is enabled, 18, 19 or 20 octets are stuffed into the trailer depending on

the alignment of the G.751 E3 frame, and the G.751 E3 PLCP frame. This

yields a nominal PLCP frame rate of 125 µs.

M2TYPE:

The M2TYPE bit selects the type of code transmitted in the M2 octet. These

codes are required in systems implementing the IEEE-802.6 DQDB protocol.

When a logic 0 is written to M2TYPE, the fixed pattern type 0 code is

transmitted in the M2 octet. When a logic 1 is written to M2TYPE, the 1023

cyclic code pattern (starting with B6 hexadecimal and ending with 8D

hexadecimal) is transmitted in the M2 octet. Please refer to TA-TSY-000772,

Issue 3 and Supplement 1, for details on the codes.

M1TYPE:

The M1TYPE bit selects the type of code transmitted in the M1 octet. These

codes are required in systems implementing the IEEE-802.6 DQDB protocol.

When a logic 0 is written to M1TYPE, the fixed pattern type 0 code is

transmitted in the M1 octet. When a logic 1 is written to M1TYPE, the 1023

cyclic code pattern (starting with B6 hexadecimal and ending with 8D

hexadecimal) is transmitted in the M1 octet. Please refer to TA-TSY-000772,

Issue 3 and Supplement 1, for details on the codes.

FORM[1:0]:

When EXT = 0 and PLCPEN = 0, the FORM[1:0] bits and the TFRM[1:0] bits

in the S/UNI-QJET Transmit Configuration register select the ATM direct-

mapped transmission frame format as shown below. When EXT = 0 and

PLCPEN = 1, the FORM[1:0] bits along with the TFRM[1:0] bits select the

transmission and PLCP frame format as shown below. When EXT = 1 and

TOCTA = 1, then the FORM[1:0] bits control the cell alignment with respect to

the transmission overhead given on TIOHM[x] as shown below. The FORM

bits have no effect if EXT = 1 and TOCTA = 0.

PM7346 Datasheet(PDF) 139 Page - PMC-Sierra, Inc

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