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TMS570LS3137 数据表(PDF) 88 Page - Texas Instruments |
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TMS570LS3137 数据表(HTML) 88 Page - Texas Instruments |
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88 / 159 page ![]() TMS570LS3137 SPNS162. – SEPTEMBER 2011 www.ti.com Table 4-28. EMIF Asynchronous Memory Switching Characteristics(1)(2)(3) NO Parameter Value Unit MIN NOM MAX Reads and Writes 1 td(TURNAROUND) Turn around time (TA)*E -3 (TA)*E (TA)*E + 3 ns Reads 3 tc(EMRCYCLE) EMIF read cycle time (EW = 0) (RS+RST+RH)* (RS+RST+RH)* (RS+RST+RH)* ns E -3 E E + 3 EMIF read cycle time (EW = 1) (RS+RST+RH+( (RS+RST+RH+( (RS+RST+RH+( ns EWC*16))*E -3 EWC*16))*E EWC*16))*E + 3 4 tsu(EMCEL-EMOEL) Output setup time, (RS)*E-3 (RS)*E (RS)*E+3 ns EMIFnCS[4:2] low to EMIFnOE low (SS = 0) Output setup time, -3 0 +3 ns EMIFnCS[4:2] low to EMIFnOE low (SS = 1) 5 th(EMOEH-EMCEH) Output hold time, EMIFnOE high (RH)*E -3 (RH)*E (RH)*E + 3 ns to EMIFnCS[4:2] high (SS = 0) Output hold time, EMIFnOE high -3 0 +3 ns to EMIFnCS[4:2] high (SS = 1) 6 tsu(EMBAV-EMOEL) Output setup time, EMIFBA[1:0] (RS)*E-3 (RS)*E (RS)*E+3 ns valid to EMIFnOE low 7 th(EMOEH-EMBAIV) Output hold time, EMIFnOE high (RH)*E-3 (RH)*E (RH)*E+3 ns to EMIFBA[1:0] invalid 8 tsu(EMBAV-EMOEL) Output setup time, (RS)*E-3 (RS)*E (RS)*E+3 ns EMIFADDR[21:0] valid to EMIFnOE low 9 th(EMOEH-EMAIV) Output hold time, EMIFnOE high (RH)*E-3 (RH)*E (RH)*E+3 ns to EMIFADDR[21:0] invalid 10 tw(EMOEL) EMIFnOE active low width (EW (RST)*E-3 (RST)*E (RST)*E+3 ns = 0) EMIFnOE active low width (EW (RST+(EWC*16 (RST+(EWC*16 (RST+(EWC*16 ns = 1) )) *E-3 ))*E )) *E+3 11 td(EMWAITH-EMOEH) Delay time from EMIFnWAIT 3E-3 4E 4E+3 ns deasserted to EMIFnOE high Writes 15 tc(EMWCYCLE) EMIF write cycle time (EW = 0) (WS+WST+WH (WS+WST+WH (WS+WST+WH ns )* E-3 )*E )* E+3 EMIF write cycle time (EW = 1) (WS+WST+WH (WS+WST+WH (WS+WST+WH ns +( EWC*16))*E +(E WC*16))*E +( EWC*16))*E -3 + 3 16 tsu(EMCEL-EMWEL) Output setup time, (WS)*E -3 (WS)*E (WS)*E + 3 ns EMIFnCS[4:2] low to EMIFnWE low (SS = 0) Output setup time, -3 0 +3 ns EMIFnCS[4:2] low to EMIFnWE low (SS = 1) 17 th(EMWEH-EMCEH) Output hold time, EMIFnWE (WH)*E-3 (WH)*E (WH)*E+3 ns high to EMIFnCS[4:2] high (SS = 0) (1) TA = Turn around, RS = Read setup, RST = Read strobe, RH = Read hold, WS = Write setup, WST = Write strobe, WH = Write hold, MEWC = Maximum external wait cycles. These parameters are programmed via the Asynchronous Bank and Asynchronous Wait Cycle Configuration Registers. These support the following ranges of values: TA[4 –1], RS[16–1], RST[64–1], RH[8–1], WS[16–1], WST[64–1], WH[8 –1], and MEWC[1–256]. See the EMIF User’s guide for more information. (2) E = EMIF_CLK period in ns. (3) EWC = external wait cycles determined by EMIFnWAIT input signal. EWC supports the following range of values. EWC[256 –1]. Note that the maximum wait time before timeout is specified by bit field MEWC in the Asynchronous Wait Cycle Configuration Register. See the EMIF User ’s Guide for more information. 88 System Information and Electrical Specifications Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback focus.ti.com: TMS570LS3137 |
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