參數(shù)資料
型號: SPAKD56366PV120
廠商: MOTOROLA INC
元件分類: 數(shù)字信號處理
英文描述: 24-BIT, 120 MHz, OTHER DSP, PQFP144
封裝: TQFP-144
文件頁數(shù): 84/147頁
文件大?。?/td> 2156K
代理商: SPAKD56366PV120
Specifications
Reset, Stop, Mode Select, and Interrupt Timing
MOTOROLA
DSP56366 Advance Information
2-11
Figure 2-2 Reset Timing
29
Delay from IRQA, IRQB, IRQC, IRQD, NMI assertion to
external memory (DMA source) access address out valid
4.25
× TC + 2.0
37.4
ns
Notes:
1.
When using fast interrupts and IRQA, IRQB,
IRQC, and IRQD are defined as level-sensitive, timings 19 through
21 apply to prevent multiple interrupt service. To avoid these timing restrictions, the deasserted Edge-triggered
mode is recommended when using fast interrupts. Long interrupts are recommended when using Level-sensitive
mode.
2.
This timing depends on several settings:
For PLL disable, using external clock (PCTL Bit 16 = 1), no stabilization delay is required and recovery time will
be defined by the PCTL Bit 17 and OMR Bit 6 settings.
For PLL enable, if PCTL Bit 17 is 0, the PLL is shutdown during Stop. Recovering from Stop requires the PLL to
get locked. The PLL lock procedure duration, PLL Lock Cycles (PLC), may be in the range of 0 to 1000 cycles.
This procedure occurs in parallel with the stop delay counter, and stop recovery will end when the last of these two
events occurs: the stop delay counter completes count or PLL lock procedure completion.
PLC value for PLL disable is 0.
The maximum value for ETC is 4096 (maximum MF) divided by the desired internal frequency (i.e., for 120 MHz
it is 4096/120 MHz = 34.1
s). During the stabilization period, TC, TH, and TL will not be constant, and their width
may vary, so timing may vary as well.
3.
Periodically sampled and not 100% tested
4.
RESET duration is measured during the time in which RESET is asserted, VCC is valid, and the EXTAL input is
active and valid. When the VCC is valid, but the other “required RESET duration” conditions (as specified above)
have not been yet met, the device circuitry will be in an uninitialized state that can result in significant power
consumption and heat-up. Designs should minimize this state to the shortest possible duration.
5.
If PLL does not lose lock
6.
VCC = 3.3 V ± 0.16 V; TJ = –40°C to + 105°C, CL = 50 pF
7.
WS = number of wait states (measured in clock cycles, number of TC). Use expression to compute maximum
value.
Table 2-7 Reset, Stop, Mode Select, and Interrupt Timing6 (Continued)
No.
Characteristics
Expression
Min
Max
Unit
VIH
RESET
Reset Value
First Fetch
All Pins
A0–A17
8
9
10
AA0460
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