参数资料
型号: ORSO42G5-1BMN484I
厂商: Lattice Semiconductor Corporation
文件页数: 94/153页
文件大小: 0K
描述: IC TRANCEIVERS FPSC 680FPGAM
产品变化通告: Product Discontinuation 01/Aug/2011
标准包装: 60
系列: *
Lattice Semiconductor
ORCA ORSO42G5 and ORSO82G5 Data Sheet
45
Figure 31 shows the quad alignment mode in the ORSO42G5.
Figure 31. Receive SONET Mode, Quad Alignment Mode – ORSO42G5
SONET Mode Receive Timing – ORSO82G5
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 AA, AB (group A1), AC, AD (group A2), BA, BB (group B1) and BC, BD (group B2)
Figure 32 shows the SONET twin alignment mode timing for the ORSO82G5. The frame pulse and SPE indicators
are show for each of the two channels (AA, AB) in twin alignment.
Figure 32. Receive Clocking Diagram for SONET Mode Twin Alignment in Block A – ORSO82G5
...
1 cycle
36 cycles TOH
1044 cycles SPE
36 cycles TOH
Start of Frame
125 μs
Clocks
RSYSCLKA2 and RSYSYSCLKB2 are sourced by RCK78A
36 cycles TOH
Start of Frame
DOUTAC_FP
DOUTAD_FP
RSYSCLK[A2,B2]
DOUTBC_FP
DOUTBD_FP
RSYSCLKA1
DOUTAA[31:0]
DOUTAA_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
RSYSCLKA1 is the read clock used for group A1
RSYSCLKA2 is the read clock used for group A2
RSYSCLKB1 is the read clock used for group B1
RSYSBLKB2 is the read clock used for group B2
36 cycles TOH
TT
T
S
SS
T
SSSS
S
Start of Frame
DOUTAA_SPE
DOUTAB[31:0]
DOUTAB_SPE
DOUTAB_FP
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