DSP56321VF275 Freescale, DSP56321VF275 Datasheet - Page 47

• 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

2.4.10 Considerations For GPIO Use
The following considerations can be helpful when GPIO is used.
2.4.10.1 GPIO as Output
2.4.10.2 GPIO as Input
GPIO inputs are not synchronized with the core clock. When only one GPIO bit is polled, this lack of
synchronization presents no problem, since the read value can be either the previous value or the new value of the
corresponding GPIO pin. However, there is the risk of reading an intermediate state if:
Therefore, when GPIO bits are read, the recommended practice is to poll continuously until two consecutive read
operations have identical results.
Freescale Semiconductor
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The time from fetch of the instruction that changes the GPIO pin to the actual change is seven core clock
cycles, if the instruction is a on
delays.
The maximum rise or fall time of a GPIO pin is 13 ns (TTL levels, assuming that the maximum of 50 pF
load limit is met).
Two or more GPIO bits are treated as a coupled group (for example, four possible status states encoded in
two bits).
The read operation occurs during a simultaneous change of GPIO pins (for example, the change of 00 to 11
may happen through an intermediate state of 01 or 10).
TIO
TIO (Input)
Address
Figure 2-26.
Figure 2-27.
e
-cycle instruction and there are no pipeline stalls or any other pipeline
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DSP56321 Technical Data, Rev. 11
TIO Timer Event Input Restrictions
Timer Interrupt Generation
481
First Interrupt Instruction Execution
486
AC Electrical Characteristics
2-27