DSP56371 Datasheet, PDF (38/68 Pages) Motorola, Inc – high density CMOS device

Reset, Stop, Mode Select, and Interrupt Timing
Table 18. Clock Operation 150 and 181 MHz Values
No.
Characteristics
Symbol
150 MHz
Min
Max
181 MHz
Min
Max
6 EXTAL input high ^1,2
(40% to 60% duty cycle)
7 EXTAL input low^1,2
(40% to 60% duty cycle)
8 EXTAL cycle time²
• With PLL disabled
• With PLL enabled
9 Instruction cycle time= I_CYC = T_C3
• With PLL disabled
• With PLL enabled
Eth
3.33ns 100ns 2.75ns 100ns
Etl
3.33ns 100ns 2.75ns 100ns
Etc
6.66ns
inf
5.52ns
inf
6.66ns 200ns 5.52ns 200ns
Icyc
6.66ns
inf
5.52ns
inf
6.66ns 13.0ns 5.52ns 13.0ns
Note:
1. Measured at 50% of the input transition
2. The maximum value for PLL enabled is given for minimum V_CO and maximum MF.
3. The maximum value for PLL enabled is given for minimum V_CO and maximum DF.
4. The indicated duty cycle is for the specified maximum frequency for which a part is rated. The minimum clock high or low
time required for correct operation, however, remains the same at lower operating frequencies; therefore, when a lower
clock frequency is used, the signal symmetry may vary from the specified duty cycle as long as the minimum high time
and low time requirements are met.
11 Reset, Stop, Mode Select, and Interrupt Timing
Table 19. Reset, Stop, Mode Select, and Interrupt Timing
No.
Characteristics
10 Delay from RESET assertion to all output pins at
reset value³
11 Required RESET duration⁴
• Power on, external clock generator, PLL
disabled
• Power on, external clock generator, PLL
enabled
12 Syn reset setup time from RESET
• Maximum
13 Syn reset de assert delay time
• Minimum
• Maximum(PLL enabled)
14 Mode select setup time
15 Mode select hold time
16 Minimum edge-triggered interrupt request
assertion width
17 Minimum edge-triggered interrupt request
deassertion width
Expression
—
2 x T_C
2 x T_C
T_C
2× T_C
(2xT_C)+T_LOCK
2 xT_C
2 xT_C
Min
Max
Unit
—
11
ns
11.1
—
ns
11.1
--
ns
—
5.5
ns
11.1
—
ns
5.0
ms
10.0
—
ns
10.0
—
ns
11.1
—
ns
11.1
—
ns
DSP56371 Data Sheet, Rev. 4.1
38
Freescale Semiconductor