PM7346 datasheet(112/419 Pages) PMC

112 / 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 91

are set to 00. Byte alignment is chosen if these FORM[1:0] bits are set to any

other value. The number of TICLK periods between transmission format

overhead bit positions must be divisible by 4 (for nibble alignment) or 8 (for

byte alignment). When TOCTA is set to logic 0, no octet alignment is

performed , and there is no restriction on the number of TICLK periods

between transmission format overhead bit positions.

DS27_53:

The DS27_53 bit is used to select between the long data structure (27 words

in 16-bit mode and 53 bytes in 8-bit mode) and the short data structure (26

words in 16-bit mode and 52 bytes in 8-bit mode) on the ATM interface. When

DS27_53 is set to logic one, the RXCP-50 and TXCP-50 blocks are

configured to operate with the long data structure; when DS27_53 is set to

logic zero, the RXCP-50 and TXCP-50 are configured to operate with the

short data structure.

8KREFO:

The 8KREFO bit is used, in conjunction with the PLCPEN bit in the SPLR

Configuration Register to select the function of the

REF8KO/RPOHFP/RFPO/RMFPO[x] output pin. When PLCPEN is logic 1,

the RPOHFP function will be selected and 8KREFO has no effect (note that

RPOHFP is inherently an 8kHz reference). If PLCPEN is logic 0, then if

8KREFO is logic 1, then an 8kHz reference will be derived from the RCLK[x]

signal and output on REF8KO. If 8KREFO and PLCPEN are both logic 0,

then the RXMFPO register bit in the S/UNI-QJET Configuration 2 register will

select either the RFPO or RMFPO function.

PM7346 Datasheet(PDF) 112 Page - PMC-Sierra, Inc