參數(shù)資料
型號: M-ORSO82G51BM680-DB
廠商: LATTICE SEMICONDUCTOR CORP
元件分類: FPGA
英文描述: FPGA, 1296 CLBS, 333000 GATES, PBGA680
封裝: PLASTIC, FBGA-680
文件頁數(shù): 51/123頁
文件大?。?/td> 2207K
代理商: M-ORSO82G51BM680-DB
Lattice Semiconductor
ORCA ORSO82G5 Data Sheet
33
Payload Sub-block
The Payload sub block is activated by the cell mode frame pulse (cell mode) or DINxx_FP from FPGA (SONET
mode). A pulse on this signal indicates the start of a frame.
In SONET mode, only two types of data bytes are in each frame:
TOH bytes
SPE data bytes
There are N x 3 (N = 48) bytes of TOH per row and there are a total of 9 rows in a SONET frame. The rest of the
bytes in each row are SPE data bytes in SONET mode.
TOH Sub-block
This block is responsible for the 144 (48 x 3) bytes of TOH at the beginning of each row of the transport frame. The
TOH bytes may be transmitted transparently from the FPGA logic or may be inserted by the TOH block
(AUTO_TOH mode). The TOH data is transferred across the FPGA/core interface as 32-bit words, hence 36 clock
cycles (12 x 3) are needed to transfer a TOH row. TOH insertion is controlled by software register bits as shown in
the Register Map tables. The TOH values inserted in Auto TOH mode are shown in Table 5. The values are for all
STS-1s in the STS-48 frame unless noted otherwise.
Table 5. Inserted TOH Values (all 0x)
The TOH block can perform A1/A2 corruption by inverting the A1/A2 bytes and also can forces B1 errors by invert-
ing the B1 byte. A RDI can be injected by forcing the K2 byte to “00000110”. In SONET mode, all TOH bytes can be
transparently sent from the FPGA as an option. Error and RDI insertion are controlled by software register bits as
shown in the Register Map tables.
A1 = F6
A2 = 28
J0 = STS-1 ID,
every 4th. STS-1
J0 = 00, other STS-1s
B1 = calculated,
1st. STS-1
B1 = 00, other STS-1s
E1 = 00
F1 = link number,
1st. STS-1
F1 = 00, other STS-1s
D1 = 00
D = 002
D3 = 00
H1 = 62, 1st. STS-1
H1 = 93 other STS-1s
H2 = 0A, 1st. STS-1
H2 = FF other STS-1s
H3 = 00
B2 = 00
K1 = 00
K2 = 06 for RDI,
K2 = 00 otherwise,
1st. STS-1
K2 = 00, other STS-1s
D4 = 00
D5 = 00
D6 = 00
D7 = 00
D8 = 00
D9 = 00
D10 = 00
D11 = 00
D12 = 00
S1 = 00
M1 = 00
E2 = 00
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