参数资料
型号: ORT82G5-2BM680
厂商: LATTICE SEMICONDUCTOR CORP
元件分类: FPGA
英文描述: FPGA, 1296 CLBS, 380000 GATES, PBGA680
封装: PLASTIC, BGA-680
文件页数: 40/110页
文件大小: 1459K
代理商: ORT82G5-2BM680
Lattice Semiconductor
35
Data Sheet
January 25, 2002
8b/10b SERDES Backplane Interface FPSC
ORCA ORT82G5 1.0-1.25/2.0-2.5/3.125-3.5 Gbits/s
Backplane Transceiver Core Detailed Description (continued)
Note that any channel within an alignment group can be removed from that alignment group by setting
FMPU_STR_EN_XX to 0. The disabling of any channel(s) within an alignment group will not affect the operation of
the remaining active channels. If the active channels are synchronized, that synchronization will be maintained and
no data loss will occur.
Alignment can also be done between the receive channels on two ORT82G5 devices. Each of the two devices
needs to provide its aligned K_CTRL or other alignment character to the other device, which will delay reading from
a second alignment FIFO until all channels requesting alignment on the current device AND all channels request-
ing alignment on the other device are aligned (as indicated on the K_CTRL character). This second alignment
FIFO will be implemented in FPGA logic on the ORT82G5. This scheme also requires that the reference clock for
both devices be driven by the same signal.
XAUI Lane Alignment Function (Lane Deskew)
In XAUI mode, the receive section in each lane uses the /A/ code group to compensate for lane-to-lane skew. The
mechanism restores the timing relationship between the 4 lanes by lining up the /A/ characters into a column. Fig-
ure 2 shows the alignment of four lanes based on /A/ character. A minimum spacing of 16 code-groups implies that
at least ± 80 bits of skew compensation capability should be provided, which the ORT82G5 signicantly exceeds.
2392(F)
Figure 15. Deskew Lanes by Aligning /A/ Columns
Mixing Half-rate, Full-rate Modes
When channel alignment is enabled, all receive channels within an alignment group should be congured at the
same rate. For example, channels AA, AB, can be congured for twin alignment and full-rate mode, while channels
AC, AD that form an alignment group can be congured for half-rate mode. In quad alignment mode, each receive
quad can be congured in either half or full-rate mode.
When channel alignment is disabled (this control bit NOCHALGNX is available per quad) within a quad, any
receive channel within the quad can be used in half-rate or full-rate mode. The clocking strategy for half-rate mode
in both scenarios- (channel alignment enabled and disabled) is described in section Clocking Recommendations of
ORT82G5.
LANE 0
K
RR
K
R
K
R
K
R
K
RR
K
A
LANE 1
K
RR
K
R
K
R
K
R
K
RR
K
A
LANE 2
K
RR
K
R
K
R
K
R
K
RR
K
A
LANE 3
K
RR
K
R
K
R
K
R
K
RR
K
A
LANE 0
K
RR
K
R
K
R
K
R
K
RR
K
A
LANE 1
K
RR
K
R
K
R
K
R
K
RR
K
A
LANE 2
K
RR
K
R
K
R
K
R
K
RR
K
A
LANE 3
K
RR
K
R
K
R
K
R
K
RR
K
A
相关PDF资料
PDF描述
ORT82G5-3BM680 FPGA, 1296 CLBS, 380000 GATES, PBGA680
OS10040280G-012 FIBER OPTIC RECEIVER, 1290-1600nm, PANEL MOUNT, FC/APC CONNECTOR
OT-WBSC-Y-A-10-X-9-M-3-05-FA FIBER OPTIC SPLITTER/COUPLER, 1X2PORT, 10.0, PANEL MOUNT, FC/APC CONNECTOR
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