DS33W41+ Maxim Integrated Products, DS33W41+ Datasheet - Page 89

• Manufacturer Part Number: DS33W41+
• Description: IC MAPPING ETHERNET 256CSBGA
• Manufacturer: Maxim Integrated Products

Specifications of DS33W41+

• Applications: Data Transport
• Interface: Parallel/Serial
• Voltage - Supply: 1.8V, 2.5V, 3.3V
• Package / Case: 256-CSBGA
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.20.3 GFP-F Encapsulation and Decapsulation
The GFP-F protocol provides a method for encapsulating Ethernet Frames over point-to-point serial links. The
device expects a frame or multiframe synchronization signal to provide the byte boundary. This is provided by the
RSYNC and TSYNC pins. The receive functional timing is shown Figure 11-13. The transmit functional timing is
shown in Figure 11-9.
GFP-F Encapsulation is selected with the EPRTSEL register bit. However, there are two types of GFP-F: Null and
Linear Extension Mode. The device allows the selection of GFP Linear Extension through a user-configured “GFP
CRC Mode“ bit for each Encapsulator and Decapsulator (PP.EMCR.EGCM and PP.DMCR.DGCM). For each
mode, several additional register settings are required as outlined in the following sections.
In both GFP modes, the Line Header Insertion function (in PP.ELHHR and PP.ELHLR) must be programmed by
the user to insert the required GFP Type and tHEC fields. This structure, which is also known as the GFP Payload
Header, indicates the contents of the encapsulated payload. The Type field consists of sub fields that are used to
indicate the payload type (PTI), Payload FCS Indicator (PFI) Extension Header Identifier (EXI) and User Payload
Identifier (UPI).
Table 8-17. GFP Type/tHEC Field (Payload Header) Definition
The PTI field will normally be programmed to 000b for subscriber traffic. A PTI of 100b may be used for
management traffic in some applications. The PFI bit should match the user configured setting for pFCS in
PP.DMCR
EXI bits should equal 0000b for GFP Null, and 0001b for GFP Linear Extension. The UPI field should be configured
to match the type of traffic being transported. Possible UPI values are shown in the table below.
Table 8-18. GFP UPI Definitions
Rev: 063008
________________________________________________ DS33X162/X161/X82/X81/X42/X41/X11/W41/W11
1111 0000 through 1111 1110
Frame Byte Number
.
DFCSAD and PP.EMCR.EFCSAD. A PFI value of 1 indicates that the payload includes a pFCS. The
5 & 6
7 & 8
UPI bits <7:0>
0000 0001
0000 0010
0000 1000
0000 1101
0000 1110
0000 1111
0001 0000
0001 0001
Bit #
15
15
PTI
14
13
Frame-Mapped Ethernet
Frame-Mapped PPP
Frame-Mapped Multiple Access Protocol over SDH (MAPOS)
Frame-Mapped MPLS (Unicast)
Frame-Mapped MPLS (Multicast)
Frame-Mapped IS-IS
Frame-Mapped IPv4
Frame-Mapped IPv6
Reserved for proprietary use
PFI
12
tHEC
11
10
EXI
GFP Payload Information
9
8
7
6
5
4
tHEC
UPI
3
2
1
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