参数资料
型号: ORSO42G5-EV
厂商: Lattice Semiconductor Corporation
文件页数: 103/153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
53
Figure 39. OPC2 and OPC8 Block Diagrams
TX FIFO Block
In cell mode, the TXFIFO block contains the write state machine and FIFO memory. The FIFO is used to retime the
cell data from the FPGA interface at a rate of 156 MHz to the framer rate of 77.76 MHz.
The FIFO memory is implemented as a 64 x 34 FIFO. The FIFO receives data as 33-bit words with the start-of-cell
as the MSB of each word. Thus each cell occupies a maximum size of 23 words. For each link, the memory must
be capable of holding at least 2 cells or 46 words (one for write and one for read). To ensure extra space, this
capacity has been increased to 64 words. In addition, an extra bit has been reserved to store the link idle cell indi-
cator bit which is used for indicating the internally generated idle cells. Thus each word in a cell is 34 bits. Data are
written to the memory on the 156 MHz clock domain and read on the 77.76 MHz clock domain by the
Tx_Frame_Processor block. The OPC requires no response from the TXFIFO for writing data. The TXFIFO is guar-
anteed by design to not overow or underrun with correct clocking.
TX Frame Processor
The Tx_Frame_Processor (TFP) block is the primary data processing block in the both SONET mode and cell
mode. It organizes the cell data into a SONET frame before sending it to the SERDES. In cell mode, the 32-bit data
comes from the TX FIFO block. The three major TFP sub-blocks were described in the SONET mode section.
In cell mode, the Payload sub block is activated by the link_frm_sync in cell mode. A pulse on this signal from the
OPC indicates the start of a frame. Each frame contains 4 different types of bytes in cell mode:
TOH bytes (Auto TOH mode only)
Link Header (LH) bytes
Cell payload bytes
Pad bytes
TX
FIFO
OPC2
Block
OPC2_[A:B][1:2][39:0]
SYSCLK156[A:B][1:2]
32
77.76 MHz
TX
FIFO
32
77.76 MHz
TX
FIFO
OPC8
OPC8[159:0]
SYSCLK156 8
32
77.76 MHz
TX
FIFO
32
77.76 MHz
LINK 0
LINK 1
LINK 0
LINK 7
40
160
FPGA
LOGIC
Block
FPGA
LOGIC
(ORSO82G5
only)
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