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ORSPI4 датащи(PDF) 117 Page - Lattice Semiconductor |
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ORSPI4 датащи(HTML) 117 Page - Lattice Semiconductor |
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117 / 263 page ![]() Lattice Semiconductor ORCA ORSPI4 Data Sheet 117 Figure 56. XAUI Link Synchronization State Diagram Reference Clock Requirements There is one pair of SERDES reference clock inputs on the ORSPI4. The differential reference clock is distributed to all channels in the block. Each channel has a differential buffer to isolate the clock from the other channels. The input clock is preferably a differential signal; however, the device can operate with a single-ended input. The input reference clock directly impacts the transmit data eye, so the clock should have low jitter. In particular, jitter compo- Loss_of_Sync sync_status <=FAIL enable_CDET <= TRUE sync_complete reset Comma_Detect_1 enable_CDET <= FALSE cg_bad cg_bad cg_comma cg_comma cg_bad Comma_Detect_2 Comma_Detect_3 cg_comma Sync_Aqc’d_1 Sync_Aqc’d_1a sync_status <= OK no_comma and cg_bad sync_status <= OK_NOC cg_bad cg_comma Sync_Aqc’d_2 Sync_Aqc’d_3 Sync_Aqc’d_4 Sync_Aqc’d_2a Sync_Aqc’d_3a Sync_Aqc’d_4a gd_cg <= gd_cg + 1 gd_cg <= 0 cg_good cg_good x (gd_cg ! = 3) cg_bad cg_good x (gd_cg = 3) cg_good x (gd_cg ! = 3) cg_bad cg_good*(gd_cg=3) cg_good cg_bad cg_good x (gd_cg = 3) cg_good cg_good x (gd_cg ! = 3) cg_bad cg_bad cg_bad gd_cg <= 0 gd_cg <= 0 gd_cg <=gd_cg + 1 gd_cg <=gd_cg + 1 no_comma and cg_bad |
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