参数资料
型号: ORSO42G5-EV
厂商: Lattice Semiconductor Corporation
文件页数: 85/153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
37
frame pulse, is less than the minimum threshold set by RX_FIFO_MIN. In the memory map section OOS is referred
to as SYNC2_[A2,B2]_OOS, SYNC4_OOS. OVFL is referred to as SYNC2_[A2,B2]_OVFL, SYNC4_OVFL.
Receive Clocking for Multi-channel Alignment – ORSO42G5
There are a total of seven clocks for the receive path, from FPGA to the core. The two used in SONET mode are
RSYSCLKA2 (for block A), and RSYSCLKB2 (for block B). The following diagrams show the recommended clock
distribution approaches for SONET mode multi-channel alignment modes. Cell mode alignment is discussed in the
section describing the Input Port Controller (IPC).)
SONET Mode Twin Alignment – ORSO42G5
Figure 22 describes the clocking scheme for twin alignment. In twin alignment, the valid channel pairs are AC,AD in
block A and BC,BD in block B. The gure provides the clocking scheme for block A as an example. RSYSCLKA2
should be sourced from RCK78A, RWCKAC or RWCKAD. For the ORSO42G5, the use of RCK78A is recom-
mended since it uses primary clock routing resources. This clocking approach provides the required 0 ppm clock
frequency matching for each pair and provides exibility in applications where the two pairs are received from asyn-
chronous sources.
Figure 22. Receive Clocking Diagram for Twin Alignment in Block A – ORSO42G5
SONET Mode Quad Alignment – ORSO42G5
Figure 23 shows the clocking scheme for four-channel alignment. In this application, both clocks RSYSCLKA2 and
RSYSCLKB2 should be sourced from a common clock. Either RCK78A or RCK78B can be used as a common
clock source. The gure shows RCK78A being used as the clock source.
SERDES
2.488 Gbps
DEMUX
RWCKAC (77.76 MHz)
FPGA
RWCKAD
RCK78A
Alignment
SPE
Generator
RSYSCLKA2
Framer,
Descrambler
Logic Common to Block
REFCLKA[P,N]
(155.52 MHz)
Channel AC
Channel AD
HDIN[P:N]_AC
SERDES
2.488 Gbps
HDIN[P:N]_AD
DEMUX
Alignment
SPE
Generator
Framer,
Descrambler
RWCKAD
FIFO
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