RELEASED
PM7350 S/UNI-DUPLEX
DATA SHEET
PMC-1980581
ISSUE 5
DUAL SERIAL LINK PHY MULTIPLEXER
bit must be logic 1 for this bit to have effect. If CELLCRC and PREPEND are
logic 1, the second User Prepend byte is expected to contain the CRC-8
syndrome for the preceding cell. A non-zero remainder shall result in a
maskable interrupt and, if enabled by the CNTCELLERR bit, a cell error count
increment. If CELLCRC is logic 0, the contents of the second User Prepend
byte are not examined.
CNTCELLERR:
The CNTCELLERR bit allows the redefinition of the Receive High-Speed
Serial HCS Error Count register to include the number of cell CRC-8 errors.
If CNTCELLERR, CELLCRC and PREPEND are logic 1, each non-zero
remainder for the CRC-8 protecting the entire cell or non-zero remainder
HCS results in an increment. (Simultaneous cell CRC-8 and HCS errors
result in a single increment.) If CNTCELLERR, CELLCRC, and PREPEND
are logic 0, the count represents the number of HCS errors.
DDSCR and HDSCR:
The Disable Descramble (DDSCR) and Header Descramble enable (HDSCR)
bits control the descrambling of the cell by the x43 + 1 self-synchronous
descrambler. When DDSCR is a logic one, cell header and payload
descrambling is disabled. When DDSCR is a logic zero, payload
descrambling is enabled and cell header descrambling is determined by
HDSCR. HDSCR enables descrambling of the System Prepend, User
Prepend, User Header, and HCS byte collectively. The operation of the
DDSCR and HDSCR bits is summarized below:
DDSCR HDSCR Operation
1
0
0
X
0
1
Cell payload and header descrambling is
disabled. THIS CONFIGURATION SHOULD
ONLY BE USED FOR DIAGNOSTIC
PURPOSES.
Cell payload is descrambled. Cell header is
left unscrambled. THIS CONFIGURATION
SHOULD ONLY BE USED FOR
DIAGNOSTIC PURPOSES.
Cell payload and header are both
descrambled.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
139
PMC [ PMC-SIERRA, INC ]
