參數(shù)資料
型號： DSP56854FGE
廠商： Freescale Semiconductor
文件頁數(shù)： 26/60頁
文件大?。?/td> 0K
描述： IC DSP 16BIT 120MHZ 128-LQFP
標(biāo)準(zhǔn)包裝： 72
系列： 568xx
核心處理器： 56800E
芯體尺寸： 16-位
速度： 120MHz
連通性： EBI/EMI，SCI，SPI，SSI
外圍設(shè)備： DMA，POR，WDT
輸入/輸出數(shù)： 41
程序存儲器容量： 32KB（16K x 16）
程序存儲器類型： SRAM
RAM 容量： 16K x 16
電壓 - 電源 (Vcc/Vdd)： 1.62 V ~ 1.98 V
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 128-LQFP
包裝： 托盤
56854 Technical Data, Rev. 6
32
Freescale Semiconductor
4.6 External Memory Interface Timing
The External Memory Interface is designed to access static memory and peripheral devices. Figure 4-10 shows
sample timing and parameters that are detailed in Table 4-11.
The timing of each parameter consists of both a fixed delay portion and a clock related portion; as well as user
controlled wait states. The equation:
t = D + P * (M + W)
should be used to determine the actual time of each parameter. The terms in the above equation are defined as:
t
parameter delay time
D fixed portion of the delay, due to on-chip path delays.
P the period of the system clock, which determines the execution rate of the part (i.e. when the device is
operating at 120 MHz, P = 8.33 ns).
M Fixed portion of a clock period inherent in the design. This number is adjusted to account for possible
clock duty cycle derating.
W the sum of the applicable wait state controls. See the “Wait State Controls” column of Table 4-11 for
the applicable controls for each parameter. See the EMI chapter of the 83x Peripheral Manual for
details of what each wait state field controls.
Some of the parameters contain two sets of numbers. These parameters have two different paths and clock edges
that must be considered. Check both sets of numbers and use the smaller result. The appropriate entry may change
if the operating frequency of the part changes.
The timing of write cycles is different when WWS = 0 than when WWS > 0. Therefore, some parameters contain
two sets of numbers to account for this difference. The “Wait States Configuration” column of Table 4-11 should
be used to make the appropriate selection.
Table 4-6 PLL Timing
Operating Conditions: VSS = VSSIO = VSSA = 0 V, VDD = 1.62-1.98V, VDDIO = VDDA = 3.0–3.6V, TA = –40° to +120°C, CL ≤ 50pF, fop = 120MHz
Characteristic
Symbol
Min
Typ
Max
Unit
External reference crystal frequency for the PLL1
1.
An externally supplied reference clock should be as free as possible from any phase jitter for the PLL to work correctly.
The PLL is optimized for 4MHz input crystal.
fosc
2
4
MHz
PLL output frequency
fclk
40
—
240
MHz
PLL stabilization time 2
2.
This is the minimum time required after the PLL setup is changed to ensure reliable operation.
tplls
—
1
10
ms
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