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MPC850 датащи(PDF) 47 Page - Freescale Semiconductor, Inc |
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MPC850 датащи(HTML) 47 Page - Freescale Semiconductor, Inc |
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47 / 72 page ![]() MPC850 PowerQUICC™ Integrated Communications Processor Hardware Specifications, Rev. 2 Freescale Semiconductor 47 CPM Electrical Characteristics Figure 45. SI Receive Timing Diagram with Normal Clocking (DSC = 0) 82 L1RCLK, L1TCLK frequency (DSC =1) — 16.00 or SYNCCLK/2 MHz 83 L1RCLK, L1TCLK width low (DSC =1) P + 10 — ns 83A L1RCLK, L1TCLK width high (DSC = 1)3 P + 10 — ns 84 L1CLK edge to L1CLKO valid (DSC = 1) — 30.00 ns 85 L1RQ valid before falling edge of L1TSYNC4 1.00 — L1TCLK 86 L1GR setup time2 42.00 — ns 87 L1GR hold time 42.00 — ns 88 L1xCLK edge to L1SYNC valid (FSD = 00) CNT = 0000, BYT = 0, DSC = 0) —0.00 ns 1 The ratio SyncCLK/L1RCLK must be greater than 2.5/1. 2 These specs are valid for IDL mode only. 3 Where P = 1/CLKOUT. Thus for a 25-MHz CLKO1 rate, P = 40 ns. 4 These strobes and TxD on the first bit of the frame become valid after L1CLK edge or L1SYNC, whichever is later. Table 17. SI Timing (continued) Num Characteristic All Frequencies Unit Min Max L1RxD (Input) 79 76 77 74 L1RCLK (FE=0, CE=0) (Input) L1RCLK (FE=1, CE=1) (Input) L1RSYNC (Input) L1ST n (Output) 71 70 RFSD=1 75 72 73 78 BIT0 71a |
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