参数资料
型号: ORSO42G5-EV
厂商: Lattice Semiconductor Corporation
文件页数: 93/153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
44
SPE Generator
The SPE generator in the ORSO42G5 and ORSO82G5 is used to indicate the payload and overhead portions of a
SONET frame. It is present in the SONET data path only. The SPE generator generates row, column and STS
counters based on the frame pulse received from the (24 x 33) alignment FIFO or from the descrambler if align-
ment FIFOs are bypassed. It also retimes the 32-bit data in order to align it with the SPE indicator. The SPE gener-
ator will also detect negative or positive pointer justication (if justication is enabled) by looking at the ID bits in the
H1 and H2 bytes and adjust the SPE indicator for the STS-1 frame being justied as follows:
During positive pointer justication, the SPE will be low during H3 byte and the SPE byte following it.
During negative pointer justication, the SPE will be high during H3 byte.
During no justication, the SPE will be low during H3 byte.
This block only detects the incoming pointer bytes for SPE generation. This capability can be enabled by software
control. By default, the SPE generator will ignore any pointer justication. This block has no capability of any
pointer processing, pointer checking or pointer mover operation and ignores “new data” indications from the
SONET specication.
SONET Mode Receive Timing – ORSO42G5
This section contains timing diagrams for major interfaces of this block to the FPGA logic when SONET frames are
to be transferred.
When operating in SONET mode, the entire SONET frame is sent to the FPGA. In multi-channel alignment
mode(s), data from all channels within an alignment group are aligned to the A1A2 framing bytes.
Each SONET frame is 125μs. The frame starts with 36 clock cycles (77.76 MHz) of TOH followed by 1044 clock
cycles of SPE, followed by 36 clock cycles of TOH, 1044 cycles of SPE.
The DOUTxx_SPE signal indicates TOH or SPE in the data (low for TOH, high for SPE)
Twin pairs are AC, AD (group A2) and BC, BD (group B2)
Figure 32 shows the SONET twin alignment mode timing for the ORSO42G5. The frame pulse and SPE indicators
are show for each of the two channels (AC, AD) in twin alignment.
Figure 30. Receive Clocking Diagram for SONET Mode Twin Alignment in Block A – ORSO42G5
RSYSCLKA2
DOUTAC[31:0]
DOUTAC_FP
TT
T
S
SS
T
SSSS
S
...
1 cycle
36 cycles TOH
1
044 cycles SPE
36 cycles TOH
Start of Frame
125 μs
Data
T Represents TOH
S Represents SPE
DOUTxx-SPE is high for SPE, low for TOH
Clocks
RSYSCLKA2 is the read clock used for group A2
RSYSBLKB2 is the read clock used for group B2
36 cycles TOH
TT
T
S
SS
T
SSSS
S
Start of Frame
DOUTAC_SPE
DOUTAD[31:0]
DOUTAD_SPE
DOUTAD_FP
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