参数资料
型号: PM7351-BI
厂商: PMC-SIERRA INC
元件分类: 数字传输电路
英文描述: OCTAL SERIAL LINK MULTIPLEXER
中文描述: ATM/SONET/SDH SUPPORT CIRCUIT, PBGA304
封装: 31 X 31 MM, 1.51 MM HEIGHT, 1.27 MM PITCH, SBGA-304
文件页数: 51/174页
文件大小: 1790K
代理商: PM7351-BI
RELEASED
PM7351 S/UNI-VORTEX
DATA SHEET
PMC-1980582
ISSUE 5
OCTAL SERIAL LINK MULTIPLEXER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
41
Table 3 : Assigned Bit Oriented Codes
Function
Codeword (left bit
transmitted first)
Remote Defect Indication (RDI)
11111111 00000000
Loopback activate
11111111 01000000
Loopback deactivate
11111111 00100000
Remote reset activate
11111111 01100000
Remote reset deactivate
11111111 00010000
Reserved
11111111 01010000
. . .
. . .
Reserved
11111111 00000100
User Defined
11111111 01000100
. . .
. . .
User Defined
11111111 00111110
Idle Code
11111111 01111110
9.2.3 Cell Delineation Process
The S/UNI-VORTEX performs HCS cell delineation, payload descrambling, idle
cell filtering and header error detection to recover valid cells from the receive
high-speed links. These functions are performed in the spirit of ITU-T
Recommendation I.432.1, but support 9 to 13 byte cell headers.
Cell delineation is the process of framing to cell boundaries using the header
check sequence (HCS) field found in the cell header. The HCS is a CRC-8 (x
8
+
x
2
+ x + 1) calculation over all octets of the cell header. In accordance with ITU-
T Recommendation I.432.1, the coset polynomial x
6
+ x
4
+ x
2
+ 1 is added
(modulo 2) to the received HCS octet before comparison with the calculated
result. When performing delineation, correct HCS calculations are assumed to
indicate cell boundaries.
The cell delineation circuitry performs a sequential bit-by-bit hunt for a correct
HCS sequence. This state is referred to as the HUNT state. When a correct
HCS is found, a particular cell boundary is assumed and the PRESYNC state is
entered. This state verifies that the previously detected HCS pattern was not a
false indication. If the HCS pattern was a false indication then an incorrect HCS
should be received within the next DELTA cells and the delineation state
machine falls back to the HUNT state. If an incorrect HCS is not found in this
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