PM5380-BI PMC-Sierra, Inc., PM5380-BI Datasheet - Page 386

• 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
Bit 31 of each word is the most significant bit (which corresponds to the first bit transmitted).
Octets are written in the same order they are to be transmitted on the SONET line. The start of
the packet is marked with TSOP/RSOP set high and the end of the packet is marked with
TEOP/REOP set high. All words are composed of four octets, except the last word of a packet,
which can have one, two, three or four bytes of valid data, determined by the
TMOD[1:0]/RMOD[1:0] signals.
Both the start and the end of the packet are identified by the TSOP/RSOP and TEOP/REOP
signals. In transmit direction, all packets marked with TERR and TEOP will be appended by
the HDLC abort sequence by the TXFP block. In the receive direction, HDLC aborted packets,
invalid packets, illegal length packets are marked by RERR and REOP.
Figure 21 32-bit wide, 109 Byte Packet Data Structure
When transferring ATM cells over the POS-PHY Level 3 interface, the UTOPIA ATM cell
structures are used. The CELLFORM register bit defines the size of the ATM cell structure
when a channel is configured for ATM traffic in POS-PHY operation. A single ATM cell
structure may be transferred in multiple interface data bursts less than 52/56 bytes in size.
The first word of the ATM cell structure is marked by TSOP/RSOP and the last word of the
structure is marked by TEOP/REOP. In the transmit direction, the ATM cell will be transmitted
when the entire ATM cell structure is received. In the receive direction, the ATM cell structures
will contain complete ATM cells. The TERR signal must be low at all times for the channel.
RERR signal will be low at all times for the channel.
Word 28
Word 1
Word 2
Word 3
Word 4
Word 5
Word 6
Bit 31
Byte 109
Byte 13
Byte 17
Byte 21
Byte 1
Byte 5
Byte 9
Bit 24
Bit 23
S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet
Byte 10
Byte 14
Byte 18
Byte 22
Byte 2
Byte 6
XX
A 109 Byte Packet
Bit 16
Bit 15
Byte 11
Byte 15
Byte 19
Byte 23
Byte 3
Byte 7
XX
Bit 8
Bit 7
Byte 12
Byte 16
Byte 20
Byte 24
Byte 4
Byte 8
XX
Released
386
Bit 0