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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83848JSQ датащи(PDF) 77 Page - Texas Instruments |
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DP83848JSQ датащи(HTML) 77 Page - Texas Instruments |
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77 / 80 page  www.national.com 76 8.2.25 RMII Receive Timing Note: Per the RMII Specification, output delays assume a 25pF load. Note: CRS_DV is asserted asynchronously in order to minimize latency of control signals through the Phy. CRS_DV may toggle synchronously at the end of the packet to indicate CRS deassertion. Note: RX_DV is synchronous to X1. While not part of the RMII specification, this signal is provided to simplify recovery of receive data. Note: CRS ON delay is measured from the first bit of the JK symbol on the PMD Input Pair to initial assertion of CRS_DV. Note: CRS OFF delay is measured from the first bit of the TR symbol on the PMD Input Pair to initial de-assertion of CRS_DV. Note: Receive Latency is measured from the first bit of the symbol pair on the PMD Input Pair. Typical values are with the Elasticity Buffer set to the default value (01). Parameter Description Notes Min Typ Max Units T2.25.1 X1 Clock Period 50 MHz Reference Clock 20 ns T2.25.2 RXD[1:0], CRS_DV, RX_DV, and RX_ER output delay from X1 rising 214 ns T2.25.3 CRS ON delay From JK symbol on PMD Receive Pair to initial assertion of CRS_DV 18.5 bits T2.25.4 CRS OFF delay From TR symbol on PMD Receive Pair to initial deassertion of CRS_DV 27 bits T2.25.5 RXD[1:0] and RX_ER latency From symbol on Receive Pair. Elasticity buffer set to default value (01) 38 bits CRS_DV X1 RXD[1:0] RX_ER T2.25.2 T2.25.1 T2.25.2 PMD Input Pair IDLE Data (J/K) T2.25.3 T2.25.5 Data (TR) T2.25.4 RX_DV T2.25.2 T2.25.2 |
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