AM3892BCYG120 Datasheet, PDF (226/308 Pages) Texas Instruments – AM389x Sitara™ ARM® Processors

AM3894
AM3892
SPRS681E – OCTOBER 2010 – REVISED JULY 2012
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Table 8-58. Switching Characteristics Over Recommended Operating Conditions for GPMC/NOR Flash
Interface - Asynchronous Mode (continued)
(see Figure 8-56, Figure 8-57, Figure 8-58, Figure 8-59, Figure 8-60, Figure 8-61)
NO.
PARAMETER
15 t_d(nCSV-DIR)
16 t_d(nCSV-DIR)
17 t_w(AIV)
19 t_{d(nCSV-nOEIV)}
Delay time, GPMC_CS[x] valid to GPMC_DIR high
Delay time, GPMC_CS[x] valid to GPMC_DIR low
Address invalid duration between 2 successive R/W accesses
Delay time, GPMC_CS[x] valid to GPMC_OE_RE invalid (burst
read)
21 t_w(AV)
26 t_d(nCSV-nWEV)
28 t_{d(nCSV-nWEIV)}
29 t_d(nWEV-DV)
30 t_d(DV-nCSV)
38 t_d(nOEV-AIV)
Pulse duration, address valid: second, third and fourth accesses
Delay time, GPMC_CS[x] valid to GPMC_WE valid
Delay time, GPMC_CS[x] valid to GPMC_WE invalid
Delay time, GPMC_WE valid to data bus valid
Delay time, data bus valid to GPMC_CS[x] valid
Delay time, GPMC_OE_RE valid to GPMC_A[16:1]_D[15:0]
address phase end
MIN
L - 0.2⁽⁷⁾
M - 0.2⁽⁸⁾
G ⁽⁹⁾
I - 0.2⁽¹⁰⁾
D ⁽¹¹⁾
E - 0.2⁽¹²⁾
F - 0.2⁽¹³⁾
J - 0.2⁽⁵⁾
MAX
L + 2.0⁽⁷⁾
M + 2.0⁽⁸⁾
I + 2.0⁽¹⁰⁾
E + 2.0⁽¹²⁾
F + 2.0⁽¹³⁾
2.0
J + 2.0⁽⁵⁾
2.0
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
(8) = M - nCS Max Delay + nOE Min Delay
M = ((RdCycleTime - CSOnTime) * (TimeParaGranularity + 1) - 0.5 * CSExtraDelay) * GPMC_FCLK.
Parameter M expression is given as one example of GPMC programming. The IO DIR signal goes from IN to OUT after both
RdCycleTime and BusTurnAround completion. Behavior of the IO direction signal depends on the kind of successive read/write
accesses performed to the memory and multiplexed or non-multiplexed memory addressing scheme, whether the bus keeping feature is
enabled or not. The IO DIR behavior is automatically handled by the GPMC controller.
(9) G = Cycle2CycleDelay * GPMC_FCLK
(10) = I - nCS Max Delay + nOE Min Delay
I = ((OEOffTime + (n - 1) * PageBurstAccessTime - CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (OEExtraDelay - CSExtraDelay)) *
GPMC_FCLK
(11) D = PageBurstAccessTime * (TimeParaGranularity + 1) * GPMC_FCLK
(12) = E - nCS Max Delay + nWE Min Delay
E = ((WEOnTime - CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (WEExtraDelay - CSExtraDelay)) * GPMC_FCLK
(13) = F - nCS Max Delay + nWE Min Delay
F = ((WEOffTime - CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (WEExtraDelay - CSExtraDelay)) * GPMC_FCLK
226 Peripheral Information and Timings
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