参数资料
型号: ORSO42G5-EV
厂商: Lattice Semiconductor Corporation
文件页数: 100/153页
文件大小: 0K
描述: BOARD EVAL DEV PLATFORM ORSO42G5
标准包装: 1
系列: ORCA® 4 系列
类型: FPGA
适用于相关产品: ORSO42G5
所含物品: 板,线缆,电源
其它名称: ORSO42G5EV
Lattice Semiconductor
ORCA ORSO42G5 and ORSO82G5 Data Sheet
50
Figure 36. Cell Mapping in SONET Frame
The cells are placed in a SONET frame such that the rst cell starts at the rst SPE column of the rst row (145th
column. 144 columns are taken up by TOH). Subsequent cells are placed contiguously, skipping the Transport
OverHead (TOH) columns when appropriate.
The ORSO42G5 and ORSO82G5 supports four cell sizes with varying payloads. The total cell size sent across the
backplane is the combined size of the user cell payload (cell header and data), user BIP and the Link Header byte.
Table 9 indicates the cell sizes supported by the ORSO42G5 and ORSO82G5 within a STS-48c frame. Only one
cell size can be used at a time.
Table 9. ORSO42G5 and ORSO82G5 Supported Cell Sizes
A cell cannot span multiple SONET frames. This implies that there may be some cell sizes for which some bytes
will be unused at the end of a SPE. These are called pad bytes.
Each cell is preceded by a Link Header byte as shown in Figure 37. Table 10 denes the format of the Link Header.
The Link Header byte is useful for cell delineation when cell data are striped across multiple links. The Link Header
is inserted automatically in the transmit direction by the IPC block. The Link Header is checked in the receive direc-
tion and removed by the OPC before the cell is sent across the core/FPGA interface.
Total Cell Size
(Across B/P)
User Cell Payload
Size
(Header/Data)
Link Header
Byte
User BIP Field
Cells/Frame
Number of Pad
Bytes Per SPE
77
75
1
488
8
81
79
1
464
0
85
83
1
442
14
93
91
1
404
12
Note:
To calculate the number of cells per SPE:
[(87Rows/STS-1*9Columns/STS-1)octets/(STS-1 SPE)] * 48 STS-1 = 37584 octets
337584 / TOTAL CELL SIZE = # of cells per SPE.
TO
H
BYTES
A1 A2 J0
Cell 0
Cell 1
Cell 2 (etc.)
Link Header byte
Pad bytes
BYTES
CELL
P
A
YLO
AD
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