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SPEAR600 数据表(PDF) 80 Page - STMicroelectronics |
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SPEAR600 数据表(HTML) 80 Page - STMicroelectronics |
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80 / 97 page  Timing characteristics SPEAr600 80/97 Doc ID 16259 Rev 3 Note: Values in Table 49 are referred to the common internal source clock which has a period of THCLK = 6 ns. 6.6 Ether MAC 10/100/1000 Mbps (GMAC-Univ) timing characteristics The characterization timing is given for an output load of 5 pF on the GMII TX clock and 10 pF on the other pads. The operating conditions are in worst case V=0.90 V, T=125 ° C and in best case V=1.10 V, T= 40 ° C. 6.6.1 GMII Transmit timing specifications Figure 33. GMII TX waveforms Figure 34. Block diagram of GMII TX pins Table 50. GMII TX timing Parameter Value using GMII [tCLK period = 8 ns 125 MHz] trise (tr) <1 ns tfall (tf) <1 ns tmax= t2max- t3min 2.8 ns tmin= t2min- t3max 0.4 ns tSETUP 5.19 ns Tmin Tmax GMIITX_CLK TXD0-TXD3, GMIITX_D4-GMIITX_D7, TXEN, TXER Tclock Tr Tf Q Q SET CLR D t2 t3 GMII_TXCLK TX[0..3], GMII_TX[4..7], TXEN, TXER CLK TX[0..3], GMII_TX[4..7], TXEN, TXER |
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