PM5380-BI PMC-Sierra, Inc., PM5380-BI Datasheet - Page 413
PM5380-BI
Manufacturer Part Number
PM5380-BI
Description
Network Interface, SATURN User Network Interface (8x155) Telecom Standard Product
Manufacturer
PMC-Sierra, Inc.
Datasheet
1.PM5380-BI.pdf
(440 pages)
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Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC- 2010299, Issue 2
14.4 Receive Packet over SONET/SDH (POS) Level 3 System
TMOD[1:0]
TADR[2:0]
DAT[31:0]
PHY selection is performed by using in-band addressing. The TDAT[7:0] bus contains the PHY
address to be selected and is identified by TSX and TENB high. The TADR[2:0] bus is only
used for polling the FIFO fill status of the other PHY channels. The PTPA reports the polled
FIFO fill status while the STPA reports the FIFO fill status selected by TSX.
TSOP must be high during the first byte of each packet. TEOP must be high during the last byte
of the packet. It is legal to assert TSOP and TEOP at the same time. This case occurs when a
one, two, three or four byte packet is transferred. When TSOP is asserted and the previous byte
transfer was not marked with TEOP, the system interface realigns itself to the new timing, and
the previous packet is marked to be aborted.
Figure 42 Transmit POS Level 3 System Interface Timing
When transferring ATM cell structures over the POS-PHY interface, the start of the ATM cell
structure must be marked by TSOP and the end of the ATM cell structure must be marked by
TEOP. The TMOD[1:0] and TERR signals must be low. The ATM cell structure must be
configured by the CELLFORM register in TUL3.
Interface
The Receive POS Level 3 System Interface Timing diagram (Figure 43) illustrates the operation
of the interface. When the channel FIFO has sufficient data to perform a transfer, the RUL3-32
performs an in-band address cycle with RSX set high. During this cycle, the RDAT[7:0] bus
contains the PHY address to be selected.
PHY selection is performed by using in-band addressing. The RDAT[7:0] bus contains the PHY
address being selected and is identified by RSX high and RVAL low. When RVAL is high, valid
packet data is available on the POS-PHY interface. RENB is used by the layer device to pause
the interface.
TPRTY
TFCLK
TSOP
TEOP
TERR
TENB
PTPA
STPA
TSX
1
0
03
2
1
W1
3
2
W2
0
3
W3
1
0
W4
2
S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet
1
W30
1
0
W31
2
1
W32
3
2
0
3
01
1
0
W65
2
1
B261
3
3
2
Released
03
0
413
3
W1
1
0
W2
2
11
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