AM3874 Datasheet, PDF (233/345 Pages) Texas Instruments – AM387x Sitara ARM Microprocessors (MPUs)

AM3874, AM3872, AM3871
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SPRS695 – SEPTEMBER 2011
Table 8-33. Switching Characteristics Over Recommended Operating Conditions for GPMC/NOR Flash
Interface - Synchronous Mode (continued)
(see Figure 8-21, Figure 8-22, Figure 8-23 for Non-Multiplexed Modes)
(see Figure 8-24, Figure 8-25, Figure 8-26 for Multiplexed Modes)
NO
.
PARAMETER
8 t_{d(CLKH-nBEIV)}
9 t_d(CLKH-nADV)
10 t_{d(CLKH-nADVIV)}
11 t_d(CLKH-nOE)
Delay time, GPMC_CLK rising edge to GPMC_BE0_CLE, GPMC_BE1 invalid
Delay time, GPMC_CLK rising edge to GPMC_ADV_ALE transition
Delay time, GPMC_CLK rising edge to GPMC_ADV_ALE invalid
Delay time, GPMC_CLK rising edge to GPMC_OE_RE transition
OPP100
MIN
D - 3 ⁽⁶⁾
G - 3 ⁽⁷⁾
D - 3⁽⁶⁾
H - 3 ⁽⁸⁾
MAX
D + 3⁽⁶⁾
G + 6⁽⁷⁾
D + 6⁽⁶⁾
H + 5⁽⁸⁾
UNIT
ns
ns
ns
ns
(6) For single read: D = (RdCycleTime – AccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK
For burst read: D = (RdCycleTime – AccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK
For burst write: D = (WrCycleTime – AccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK
(7) For ADV falling edge (ADV activated):
• Case GpmcFCLKDivider = 0:
G = 0.5 * ADVExtraDelay * GPMC_FCLK
• Case GpmcFCLKDivider = 1:
G = 0.5 * ADVExtraDelay * GPMC_FCLK if (ClkActivationTime and ADVOnTime are odd) or (ClkActivationTime and ADVOnTime are
even)
G = (1 + 0.5 * ADVExtraDelay) * GPMC_FCLK otherwise
• Case GpmcFCLKDivider = 2:
G = 0.5 * ADVExtraDelay * GPMC_FCLK if ((ADVOnTime – ClkActivationTime) is a multiple of 3)
G = (1 + 0.5 * ADVExtraDelay) * GPMC_FCLK if ((ADVOnTime – ClkActivationTime – 1) is a multiple of 3)
G = (2 + 0.5 * ADVExtraDelay) * GPMC_FCLK if ((ADVOnTime – ClkActivationTime – 2) is a multiple of 3)
For ADV rising edge (ADV deactivated) in Reading mode:
• Case GpmcFCLKDivider = 0:
G = 0.5 * ADVExtraDelay * GPMC_FCLK
• Case GpmcFCLKDivider = 1:
G = 0.5 * ADVExtraDelay * GPMC_FCLK if (ClkActivationTime and ADVRdOffTime are odd) or (ClkActivationTime and
ADVRdOffTime are even)
G = (1 + 0.5 * ADVExtraDelay) * GPMC_FCLK otherwise
• Case GpmcFCLKDivider = 2:
G = 0.5 * ADVExtraDelay * GPMC_FCLK if ((ADVRdOffTime – ClkActivationTime) is a multiple of 3)
G = (1 + 0.5 * ADVExtraDelay) * GPMC_FCLK if ((ADVRdOffTime – ClkActivationTime – 1) is a multiple of 3)
G = (2 + 0.5 * ADVExtraDelay) * GPMC_FCLK if ((ADVRdOffTime – ClkActivationTime – 2) is a multiple of 3)
For ADV rising edge (ADV deactivated) in Writing mode:
• Case GpmcFCLKDivider = 0:
G = 0.5 * ADVExtraDelay * GPMC_FCLK
• Case GpmcFCLKDivider = 1:
G = 0.5 * ADVExtraDelay * GPMC_FCLK if (ClkActivationTime and ADVWrOffTime are odd) or (ClkActivationTime and
ADVWrOffTime are even)
G = (1 + 0.5 * ADVExtraDelay) * GPMC_FCLK otherwise
• Case GpmcFCLKDivider = 2:
G = 0.5 * ADVExtraDelay * GPMC_FCLK if ((ADVWrOffTime – ClkActivationTime) is a multiple of 3)
G = (1 + 0.5 * ADVExtraDelay) * GPMC_FCLK if ((ADVWrOffTime – ClkActivationTime – 1) is a multiple of 3)
G = (2 + 0.5 * ADVExtraDelay) * GPMC_FCLK if ((ADVWrOffTime – ClkActivationTime – 2) is a multiple of 3)
(8) For OE falling edge (OE activated) / IO DIR rising edge (IN direction) :
• Case GpmcFCLKDivider = 0:
H = 0.5 * OEExtraDelay * GPMC_FCLK
• Case GpmcFCLKDivider = 1:
H = 0.5 * OEExtraDelay * GPMC_FCLK if (ClkActivationTime and OEOnTime are odd) or (ClkActivationTime and OEOnTime are
even)
H = (1 + 0.5 * OEExtraDelay) * GPMC_FCLK otherwise
• Case GpmcFCLKDivider = 2:
H = 0.5 * OEExtraDelay * GPMC_FCLK if ((OEOnTime – ClkActivationTime) is a multiple of 3)
H = (1 + 0.5 * OEExtraDelay) * GPMC_FCLK if ((OEOnTime – ClkActivationTime – 1) is a multiple of 3)
H = (2 + 0.5 * OEExtraDelay) * GPMC_FCLK if ((OEOnTime – ClkActivationTime – 2) is a multiple of 3)
For OE rising edge (OE deactivated):
• Case GpmcFCLKDivider = 0:
H = 0.5 * OEExtraDelay * GPMC_FCLK
• Case GpmcFCLKDivider = 1:
H = 0.5 * OEExtraDelay * GPMC_FCLK if (ClkActivationTime and OEOffTime are odd) or (ClkActivationTime and OEOffTime are
even)
H = (1 + 0.5 * OEExtraDelay) * GPMC_FCLK otherwise
• Case GpmcFCLKDivider = 2:
H = 0.5 * OEExtraDelay * GPMC_FCLK if ((OEOffTime – ClkActivationTime) is a multiple of 3)
H = (1 + 0.5 * OEExtraDelay) * GPMC_FCLK if ((OEOffTime – ClkActivationTime – 1) is a multiple of 3)
H = (2 + 0.5 * OEExtraDelay) * GPMC_FCLK if ((OEOffTime – ClkActivationTime – 2) is a multiple of 3)
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Peripheral Information and Timings 233
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