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LS110GXS-1CF269C データシート(PDF) 6 Page - Lattice Semiconductor |
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LS110GXS-1CF269C データシート(HTML) 6 Page - Lattice Semiconductor |
6 / 23 page Lattice Semiconductor XPIO 110GXS Data Sheet 6 Figure 2. LVDS Loopback Mode Block Diagram LVDS Line Loopback Line loopback is a diagnostic mode that establishes a parallel connection between the output of the deserializer and the input to the serializer. When this mode is active, serial receive data is deserialized, and internally looped back to the serializer. The data provided at the serializer is transmitted via the CML output. Line loopback is acti- vated by setting the LB_P622_Enb pin to a logic low. Mode 1: Synchronous line loopback without clock clean-up. Driving LB_P622_Enb low enables line loopback mode. Connecting the LVDS output clock, RX_CK_LV_P/N, to REF_CK_P/N makes the loopback mode synchro- nous. In addition, a separate reference clock is input to RX_REF_CKP/N for use by the CDR logic. The data trans- mitted across the TX_D_P/N pins is now timed to the LVDS clock making the RX and TX data synchronous. However, the RX_CK_LV_P/N does not require SONET/SDH tolerance in order to transmit the parallel LVDS data. This means the data repeated on TX_D_P/N will have significant jitter. Figure 3. Line Loopback Mode 1 Block Diagram TX LVDS Data RX LVDS Data 10G RX 10G TX 1 0 1 0 LB_LVDS_ENb=0 RX_D_LV[0..15] TX_D_LV[0..15] TX_CL_LV_P/N Deserializer Serializer TX_D_P RX_D_P TX_D_N RX_D_N RX_CK_LV_P/N LVDS Data Loopback CMU REF_CK_P/N LVDS Clock Bypass BIST_ENb=0 BIST_LB_SC0=0 BIST_LB_SC1=1 RX LVDS Data TX LVDS Data 10G RX 10G TX 1 0 1 0 LB_LVDS_ENb=1 RX_D_LV[0..15] TX_D_LV[0..15] TX_CL_LV_P/N Deserializer Serializer TX_D_P RX_D_P TX_D_N RX_D_N RX_CK_LV_P/N Parallel Loopback CMU REF_CK_P/N BIST_ENb=0 BIST_LB_SC0=0 BIST_LB_SC1=1 LVDS Loopback Mode 1 LB_P622_ENb=0 |
同様の部品番号 - LS110GXS-1CF269C |
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同様の説明 - LS110GXS-1CF269C |
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