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MPC823 데이터시트(PDF) 47 Page - Freescale Semiconductor, Inc |
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MPC823 데이터시트(HTML) 47 Page - Freescale Semiconductor, Inc |
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47 / 70 page ![]() MPC823 ELECTRICAL SPECIFICATIONS 47 Table 12. Serial Interface Timing NUM CHARACTERISTIC 25MHZ 40MHZ 50MHZ UNIT MIN MAX MIN MAX MIN MAX 70 L1RCLK and L1TCLK frequency (DSC=0)1,3 Ñ10Ñ10Ñ10 MHz 71 L1RCLK and L1TCLK width low (DSC=0)3 P+10 Ñ P+10 Ñ P+10 Ñ ns 71a L1RCLK and L1TCLK width high (DSC=0)2 P+10 Ñ P+10 Ñ P+10 Ñ ns 72 L1TXD, L1ST(1Ð8), L1RQ, L1CLKO rise and fall times Ñ15Ñ15Ñ15 ns 73 L1RSYNC, L1TSYNC valid to L1CLK edge (SYNC setup time) 20Ñ20Ñ20Ñ ns 74 L1CLK edge to L1RSYNC and L1TSYNC invalid (SYNC hold time) 35Ñ35Ñ35Ñ ns 75 L1RSYNC and L1TSYNC rise and fall times Ñ 15 Ñ 15 Ñ 15 ns 76 L1RXD valid to L1CLK edge (L1RXD setup time) 42 Ñ 42 Ñ 42 Ñ ns 77 L1CLK edge to L1RXD invalid (L1RXD hold time) 35 Ñ 35 Ñ 35 Ñ ns 78 L1CLK edge to L1ST(1Ð8) valid 10 45 10 45 10 45 ns 78a L1SYNC valid to L1ST(1Ð8) valid4 10 45 10 45 10 45 ns 79 L1CLK edge to L1ST(1Ð8) invalid 10 45 10 45 10 45 ns 80 L1CLK edge to L1TXD valid 10 65 10 65 10 65 ns 80a L1TSYNC valid to L1TXD valid4 10 65 10 65 10 65 ns 81 L1CLK edge to L1TXD high impedance 0 42 0 42 0 42 ns 82 L1RCLK and L1TCLK frequency (DSC=1) Ñ 12.5 Ñ 16 Ñ 16 MHz 83 L1RCLK and L1TCLK width low (DSC=1) P+10 Ñ P+10 Ñ P+10 Ñ ns 83a L1RCLK and L1TCLK width high (DSC=1)2 P+10 Ñ P+10 Ñ P+10 Ñ ns 84 L1CLK edge to L1CLKO valid (DSC=1) Ñ 30 Ñ 30 Ñ 30 ns 85 L1RQ valid before falling edge of L1TSYNC3 1Ñ1Ñ1Ñ L1TCLK 86 L1GR setup time3 42Ñ42Ñ42Ñ ns 87 L1GR hold time3 42Ñ42Ñ42Ñ ns 88 L1CLK edge to L1SYNC valid (FSD = 00, CNT = 0000, BYT = 0, DSC=0) Ñ0Ñ0Ñ0 ns NOTES: 1. The ratio SyncCLK/L1RCLK must be greater than 2.5/1. 2. Where P=1/CLKO1. For a 25MHz CLKO1 rate, P=40ns. 3. These electrical speciÞcations are only valid for IDL mode. 4. The strobes and TXD2 on the Þrst bit of the frame becomes valid after L1CLK edge or L1SYNC, whichever is later. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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