DSP56321VF275 Freescale, DSP56321VF275 Datasheet - Page 64

• Manufacturer Part Number: DSP56321VF275
• Manufacturer: Freescale

Specifications of DSP56321VF275

• Device Core Size: 24b
• Format: Fixed Point
• Clock Freq (max): 275MHz
• Mips: 275
• Device Input Clock Speed: 275MHz
• Ram Size: 576KB
• Operating Supply Voltage (typ): 1.6/3.3V
• Operating Supply Voltage (min): 1.5/3/3/3/3/3/3V
• Operating Temp Range: -40C to 100C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 196
• Package Type: MA-BGA
• Lead Free Status / RoHS Status: Not Compliant

Design Considerations
The maximum internal current (I
case operation conditions—not necessarily a real application case. The typical internal current (I
reflects the average switching of the internal buses on typical operating conditions.
Perform the following steps for applications that require very low current consumption:
One way to evaluate power consumption is to use a current-per-MIPS measurement methodology to minimize
specific board effects (that is, to compensate for measured board current not caused by the DSP). A benchmark
power consumption test algorithm is listed in Appendix A. Use the test algorithm, specific test current
measurements, and the following equation to derive the current-per-MIPS value.
Where:
Note: F1 should be significantly less than F2. For example, F2 could be 66 MHz and F1 could be 33 MHz. The
4.4 Input (EXTAL) Jitter Requirements
The allowed jitter on the frequency of
(that is, it does not jump between the minimum and maximum values in one cycle) or the frequency of the jitter is
fast (that is, it does not stay at an extreme value for a long time), then the allowed jitter can be 2 percent. The phase
and frequency jitter performance results are valid only if the input jitter is less than the prescribed values.
4-4
1.
2.
3.
4.
5.
6.
7.
degree of difference between F1 and F2 determines the amount of precision with which the current rating
can be determined for an application.
Equation 4:
Equation 5:
Set the EBD bit when you are not accessing external memory.
Minimize external memory accesses, and use internal memory accesses.
Minimize the number of pins that are switching.
Minimize the capacitive load on the pins.
Connect the unused inputs to pull-up or pull-down resistors.
Disable unused peripherals.
Disable unused pin activity (for example,
I
I
F2
F1
⁄
typF2
typF1
I
MIPS
=
50
×
=
=
=
=
CCI
=
10
I
–
max) value reflects the typical possible switching of the internal buses on best-
⁄
12
MHz
current at F2
current at F1
high frequency (any specified operating frequency)
low frequency (any specified operating frequency lower than F2)
EXTAL
×
DSP56321 Technical Data, Rev. 11
3.3
=
×
is 0.5 percent. If the rate of change of the frequency of
(
33
I
typF2
×
10
–
6
I
CLKOUT
typF1
=
5.48 mA
)
⁄
(
,
F2 F1
XTAL
–
).
)
Freescale Semiconductor
CCItyp
EXTAL
) value
is slow