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5220-DS02-R 数据表(PDF) 82 Page - Broadcom Corporation. |
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5220-DS02-R 数据表(HTML) 82 Page - Broadcom Corporation. |
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82 / 90 page  BCM5220 Preliminary Data Sheet 04/20/04 Broa d c om Co rp o r a t i o n Page 70 Auxiliary Status 4 Register (Shadow Register) Document 5220-DS04-405-R Figure 17: RMII Receive Packet Timing Table 52 describes the RMII 100BASE-X propagation delay timing parameters, and Table 53 describes the RMII 10BASE-T propagation delay timing parameters. Table 52: RMII 100BASE-X Propagation Delay Timing PARAMETER SYMBOL MIN TYP MAX UNIT TD ± after TXEN Assert TXEN_TDATA 89 ns TXD to TD ± Steady State Delay TXD_TDATA 95 ns CRS_DV Assert after RD ± RX_CRS_DV 124 ns CRS_DV Deassert after RD ±, premature end RX_CRS_DV 164 ns CRS_DV Deassert after RD ±, valid EOP RX_CRS_DV_EOP 237 ns Table 53: RMII 10BASE-T Propagation Delay Timing PARAMETER SYMBOL MIN TYP MAX UNIT TD ± after TXEN Assert (sampled) TXEN_TDATA 585 ns CRS_DV Assert after RD ± RX_CRS_DV 220 ns /J/ /K/ Preamble SFD Data 0 1 0 0 00 0 0 0 0 0 0 0 0 00 00 00 0 1 11 11 1 X X X X X 0 0 X XX XX X X 1 RXD[1] RXD[0] CRS_DV REF_CLK |
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