PM5380-BI PMC-Sierra, Inc., PM5380-BI Datasheet - Page 385

• Manufacturer Part Number: PM5380-BI
• Description: Network Interface, SATURN User Network Interface (8x155) Telecom Standard Product
• Manufacturer: PMC-Sierra, Inc.

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC- 2010299, Issue 2
13.3 POS-PHY Level 3 Data Structures
Figure 19 32-bit Wide, 52 Byte ATM Cell Structure
For the 56 byte ATM cell structure, bit 31 of each word is the most significant bit (which
corresponds to the first bit transmitted). The HCS octet (H5) and HCS control bytes are passed
through this structure to the TXCP block. The UDF bytes are ignored by the TUL3. The start
of cell indications (TSOC and RSOC) are coincident with word 1 of the structure.
Figure 20 32-bit wide, 56 Byte ATM Cell Structure
The 16-bit POS-PHY Level 3 packet data structure is shown in Figure 21. The packet length of
109 bytes is chosen arbitrarily for illustrative purposes only. Other lengths are acceptable.
Word 13
Word 14
Word 1
Word 2
Word 3
Word 4
Word 5
Word 1
Word 2
Word 3
Word 4
Word 5
Word 6
Bit 31
Bit 31
Byte 12
Byte 45
Byte 12
Byte 45
Byte 1
Byte 4
Byte 8
Byte 1
Byte 4
Byte 8
H1
H1
H5
Bit 24
Bit 24
Bit 23
Bit 23
HCS Control
S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet
Byte 13
Byte 46
Byte 13
Byte 46
Byte 2
Byte 5
Byte 9
Byte 2
Byte 5
Byte 9
H2
H2
Bit 16
Bit 16
Bit 15
Bit 15
Byte 10
Byte 14
Byte 47
Byte 10
Byte 14
Byte 47
Byte 3
Byte 6
Byte 3
Byte 6
UDF
H3
H3
Bit 8
Bit 8
Bit 7
Bit 7
Byte 11
Byte 15
Byte 48
Byte 11
Byte 15
Byte 48
Byte 4
Byte 7
Byte 4
Byte 7
UDF
H4
H4
Released
385
Bit 0
Bit 0