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TMS320F2812 Datasheet(PDF) 132 Page - Texas Instruments |
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TMS320F2812 Datasheet(HTML) 132 Page - Texas Instruments |
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132 / 170 page  Lead Active Trail t d(XCOH-XZCSL) t d(XCOH-XA) t d(XCOHL-XWEL) t d(XCOHL-XWEH) t d(XCOHL-XZCSH) t en(XD)XWEL t h(XD)XWEH t dis(XD)XRNW XCLKOUT = XTIMCLK XCLKOUT = 1/2 XTIMCLK XZCS0AND1 XZCS2 XZCS6AND7 , , XA[0:18] XRD XWE XR/W XD[0:15] t d(XCOH-XRNWL) t d(XCOHL-XRNWH) DOUT XREADY t d(XWEL-XD) TMS320F2810, TMS320F2811, TMS320F2812 TMS320C2810, TMS320C2811, TMS320C2812 SPRS174S – APRIL 2001 – REVISED MARCH 2011 www.ti.com 6.25 External Interface Write Timing Table 6-34. External Memory Interface Write Switching Characteristics PARAMETER MIN MAX UNIT td(XCOH-XZCSL) Delay time, XCLKOUT high to zone chip-select active-low 1 ns td(XCOHL-XZCSH) Delay time, XCLKOUT high or low to zone chip-select inactive-high –2 3 ns td(XCOH-XA) Delay time, XCLKOUT high to address valid 2 ns td(XCOHL-XWEL) Delay time, XCLKOUT high/low to XWE low 2 ns td(XCOHL-XWEH) Delay time, XCLKOUT high/low to XWE high 2 ns td(XCOH-XRNWL) Delay time, XCLKOUT high to XR/W low 1 ns td(XCOHL-XRNWH) Delay time, XCLKOUT high/low to XR/W high –2 1 ns ten(XD)XWEL Enable time, data bus driven from XWE low 0 ns td(XWEL-XD) Delay time, data valid after XWE active-low 4 ns th(XA)XZCSH Hold time, address valid after zone chip-select inactive-high (1) ns th(XD)XWE Hold time, write data valid after XWE inactive-high TW – 2(2) ns tdis(XD)XRNW Maximum time for DSP to release the data bus after XR/W inactive-high 4 ns (1) During inactive cycles, the XINTF address bus will always hold the last address put out on the bus. This includes alignment cycles. (2) TW = Trail period, write access. See Table 6-30. A. All XINTF accesses (lead period) begin on the rising edge of XCLKOUT. When necessary, the device will insert an alignment cycle before an access to meet this requirement. B. During alignment cycles, all signals will transition to their inactive state. C. For USEREADY = 0, the external XREADY input signal is ignored. D. XA[0:18] will hold the last address put on the bus during inactive cycles, including alignment cycles. Figure 6-32. Example Write Access XTIMING register parameters used for this example: XRDLEAD XRDACTIVE XRDTRAIL USEREADY X2TIMING XWRLEAD XWRACTIVE XWRTRAIL READYMODE N/A(1) N/A(1) N/A(1) 0 0 ≥ 1 ≥ 0 ≥ 0 N/A(1) (1) N/A = “Don’t care” for this example 132 Electrical Specifications Copyright © 2001–2011, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TMS320F2810 TMS320F2811 TMS320F2812 TMS320C2810 TMS320C2811 TMS320C2812 |
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