参数资料
型号: ORSO42G5-EV
厂商: Lattice Semiconductor Corporation
文件页数: 104/153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
54
There are N x 3 (N = 48) bytes of TOH per row and there are a total of 9 rows in a SONET frame. In cell mode, the
rest of the bytes in each row after the TOH bytes are lled by cells. The rst byte in a cell is a Link Header (LH) byte.
At the end of each frame, there are pad bytes if required.
An important function of the payload block is the grouping of bytes together to be presented to the scramble logic.
Due to the insertion of the LH byte in each cell, the total cell data are not divisible by 4 (4 bytes are sent per 77.76
MHz clock cycle). At the end of each row within a SONET frame, the payload block stops sending cell data and
indicates to the TOH block to insert the next row’s TOH bytes. At the end of the TOH byte transmission, the cell data
transmission is resumed.
At the end of a cell, the cell’s BIP-8 byte is inserted. The next cell’s Link Header byte (LH) immediately follows the
previous cell’s BIP-8 byte. The MSB of the LH byte is the link idle cell indicator bit. The payload block gets this bit
from the MSB of the rst word of a cell in the memory and inserts it into the LH byte for the appropriate cell. The
rest of the LH byte is the link sequence number. This number is incremented for each subsequent cell.
After all cells have been transmitted, the appropriate number of pad bytes are sent. At a link speed of 2.5 GHz,
there are 38,880 bytes (SPE + TOH) per frame. There are 1296 bytes of TOH and 37,584 bytes of SPE. For cell
data of 85 bytes this translates to 442 cells per frame and 14 pad bytes (# of cells per frame = # of bytes of SPE/#
of bytes in a cell).
Cell Mode Transmit Timing
Figure 40 shows the transmit clocks and recommended clocking scheme in cell mode. TCK156A, TCK157B can be
used as a 156 MHz clock source for SYSCLK156[A1, A2] and SYSCLK156[B1, B2] respectively. SYSCLK156[A1,
A2] and SYSCLK[B1, B2] are shared with the receive logic in cell mode.
Figure 40. Cell Mode Transmit Timing
When operating in the two-link CELL MODE, each OPC2 Block passes cells from FPGA to embedded core.
Depending upon the congured CELL SIZE, cell transfers will take a variable number of SYSCLK156 cycles to be
transmitted across the interface. Data are always transferred across a 40-bit bus (5 octets per clock cycle).
Figure 41 shows 16 clock cycles for a cell transfer this corresponds to a cell size of 79 octets. The two control sig-
nals in the gure are dened as:
cell_begin_ok: cell request signal from core to FPGA. It will be asserted every 20 or 16 clock cycles (depending
on cell size) when the core is ready to accept cells from FPGA.
OPC2
Payload
TXFIFO
FPGA
Cell Data
TCK78A
SYSCLK156[A:B][1:2]
Cell Valid
Backpressure Signal
TCK156A
or SYSCLK568
Block
TSYSCLKxx
Logic Common to Each Block
Cell Data
Cell Valid
Backpressure Signal
SDO_BP_8
OPC8_CELLVALID
OPC2_[A:B][1:2][39:0]
CELL_BEGIN_OK_[A:B][1:2]
OPC8 [159:0]
OPC2_[A:B][1:2]_CELLVALID
OPC2
OPC8 (ORSO82G5 only)
or
OPC8
(ORSO82G5
only)
相关PDF资料
PDF描述
EEM22DTAT-S189 CONN EDGECARD 44POS R/A .156 SLD
ECC20DRES CONN EDGECARD 40POS .100 EYELET
AT-S-26-4/4/W-25-R MOD CORD STANDARD 4-4 WHITE 25'
EEC40DREI CONN EDGECARD 80POS .100 EYELET
0210490869 CABLE JUMPER 1.25MM .203M 17POS
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