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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SPC58EEX датащи(PDF) 120 Page - STMicroelectronics |
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SPC58EEX датащи(HTML) 120 Page - STMicroelectronics |
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120 / 154 page  Electrical characteristics SPC58EEx, SPC58NEx 120/154 DS11646 Rev 4 Note: In the following table, all timing specifications are referenced from REF_CLK = 1.4 V to the valid input levels, 0.8 V and 2.0 V. Figure 43. RMII receive signal timing diagram 3.18.3.7 RMII transmit signal timing (TXD[1:0], TX_EN) The transmitter functions correctly up to a REF_CLK maximum frequency of 50 MHz + 1%. There is no minimum frequency requirement. The system clock frequency must be at least equal to or greater than the TX_CLK frequency, which is half that of the REF_CLK frequency. The transmit outputs (TXD[1:0], TX_EN) can be programmed to transition from either the rising or falling edge of REF_CLK, and the timing is the same in either case. This option allows the use of non-compliant RMII PHYs. Note: In the following table, all timing specifications are referenced from REF_CLK = 1.4 V to the valid output levels, 0.8 V and 2.0 V. RMII transmit signal valid timing specified is considering the rise/fall time of the ref_clk on the pad as 1ns. Table 66. RMII receive signal timing Symbol C Characteristic Value Unit Min Max R1 CC D RXD[1:0], CRS_DV to REF_CLK setup 4 — ns R2 CC D REF_CLK to RXD[1:0], CRS_DV hold 2 — ns R3 CC D REF_CLK pulse width high 35% 65% REF_CLK period R4 CC D REF_CLK pulse width low 35% 65% REF_CLK period R1 R2 REF_CLK (input) RXD[1:0] (inputs) CRS_DV R3 R4 |
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