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MPC8544E 数据表(PDF) 47 Page - Freescale Semiconductor, Inc |
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MPC8544E 数据表(HTML) 47 Page - Freescale Semiconductor, Inc |
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47 / 117 page  MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5 Freescale Semiconductor 47 Local Bus Table 47 describes the general timing parameters of the local bus interface at BVDD = 1.8 V DC. Local bus clock to output high impedance for LAD/LDP tLBKHOZ2 —2.6 ns 5 Notes: 1. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state)(reference)(state) for inputs and t(First two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tLBIXKH1 symbolizes local bus timing (LB) for the input (I) to go invalid (X) with respect to the time the tLBK clock reference (K) goes high (H), in this case for clock one (1). Also, tLBKHOX symbolizes local bus timing (LB) for the tLBK clock reference (K) to go high (H), with respect to the output (O) going invalid (X) or output hold time. 2. All timings are in reference to LSYNC_IN for PLL enabled and internal local bus clock for PLL bypass mode. 3. All signals are measured from BVDD/2 of the rising edge of LSYNC_IN for PLL enabled or internal local bus clock for PLL bypass mode to 0.4 × BV DD of the signal in question for 2.5-V signaling levels. 4. Input timings are measured at the pin. 5. For purposes of active/float timing measurements, the Hi-Z or off state is defined to be when the total current delivered through the component pin is less than or equal to the leakage current specification. 6. tLBOTOT is a measurement of the minimum time between the negation of LALE and any change in LAD. tLBOTOT is programmed with the LBCR[AHD] parameter. 7. Maximum possible clock skew between a clock LCLK[m] and a relative clock LCLK[n]. Skew measured between complementary signals at BVDD/2. Table 47. Local Bus General Timing Parameters (BVDD = 1.8 V DC) Parameter Symbol1 Min Max Unit Notes Local bus cycle time tLBK 7.5 12 ns 2 Local bus duty cycle tLBKH/tLBK 43 57 % — LCLK[n] skew to LCLK[m] or LSYNC_OUT tLBKSKEW —150 ps 7 Input setup to local bus clock (except LUPWAIT) tLBIVKH1 2.6 — ns 3, 4 LUPWAIT input setup to local bus clock tLBIVKH2 1.9 — ns 3, 4 Input hold from local bus clock (except LUPWAIT) tLBIXKH1 1.1 — ns 3, 4 LUPWAIT input hold from local bus clock tLBIXKH2 1.1 — ns 3, 4 LALE output transition to LAD/LDP output transition (LATCH setup and hold time) tLBOTOT 1.2 — ns 6 Local bus clock to output valid (except LAD/LDP and LALE) tLBKHOV1 —3.2 ns — Local bus clock to data valid for LAD/LDP tLBKHOV2 —3.2 ns 3 Local bus clock to address valid for LAD tLBKHOV3 —3.2 ns 3 Local bus clock to LALE assertion tLBKHOV4 —3.2 ns 3 Output hold from local bus clock (except LAD/LDP and LALE) tLBKHOX1 0.9 — ns 3 Output hold from local bus clock for LAD/LDP tLBKHOX2 0.9 — ns 3 Local bus clock to output high Impedance (except LAD/LDP and LALE) tLBKHOZ1 —2.6 ns 5 Table 46. Local Bus General Timing Parameters (BVDD =2.5 V)—PLL Enabled (continued) Parameter Symbol1 Min Max Unit Notes |
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