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MPC823 датащи(PDF) 54 Page - Freescale Semiconductor, Inc |
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MPC823 датащи(HTML) 54 Page - Freescale Semiconductor, Inc |
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54 / 70 page ![]() MPC823 ELECTRICAL SPECIFICATIONS Table 15. Ethernet Timing NUM CHARACTERISTIC 25MHZ 40MHZ 50MHZ UNIT MIN MAX MIN MAX MIN MAX 120 CLSN (CTS2) width high 40 Ñ 40 Ñ 40 Ñ ns 121 RCLK1 rise and fall times Ñ 15 Ñ 15 Ñ 15 ns 122 RCLK1 width low 40 Ñ 40 Ñ 40 Ñ ns 123 RCLK1 clock period1 80 120 80 120 80 120 ns 124 RXD2 setup time 20 Ñ 20 Ñ 20 Ñ ns 125 RXD2 hold time 5Ñ5Ñ5Ñ ns 126 RENA (CD2) active delay (from RCLK1 rising edge of the last data bit) 10Ñ10Ñ10Ñ ns 127 RENA (CD2) width low 100 Ñ 100 Ñ 100 Ñ ns 128 TCLK1 rise and fall times Ñ 15 Ñ 15 Ñ 15 ns 129 TCLK1 width low 40 Ñ 40 Ñ 40 Ñ ns 130 TCLK1 clock period 1 99 101 99 101 99 101 ns 131 TXD2 active delay (from TCLK1 rising edge) 10 50 10 50 10 50 ns 132 TXD2 inactive delay (from TCLK1 rising edge) 10 50 10 50 10 50 ns 133 TENA (RTS2) active delay (from TCLK1 rising edge) 10 50 10 50 10 50 ns 134 TENA (RTS2) inactive delay (from TCLK1 rising edge) 10 50 10 50 10 50 ns 135 N/A 136 N/A 137 N/A 138 CLKx low to SDACK asserted2 Ñ20Ñ20Ñ20 ns 139 CLKx low to SDACK negated3 Ñ20Ñ20Ñ20 ns NOTES: 1. The ratio SyncCLK/RCLK1 and SyncCLK/TCLK1 must be greater than or equal to 2/1. 2. SDACK is asserted when the SDMA writes the incoming frame DA into memory. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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