MPC857DSL Motorola, MPC857DSL Datasheet - Page 36

• Manufacturer Part Number: MPC857DSL
• Description: (MPC857 / MPC862) Hardware Specifications
• Manufacturer: Motorola

Bus Signal Timing
Bus Signal Timing
Table 8 provides interrupt timing for the MPC862/857T/857DSL.
Figure 24 provides the interrupt detection timing for the external level-sensitive lines.
Figure 25 provides the interrupt detection timing for the external edge-sensitive lines.
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The timings I39 and I40 describe the testing conditions under which the IRQ lines are tested when being
defined as level sensitive. The IRQ lines are synchronized internally and do not have to be asserted or
negated with reference to the CLKOUT.
The timings I41, I42, and I43 are specified to allow the correct function of the IRQ lines detection circuitry,
and has no direct relation with the total system interrupt latency that the MPC862/857T/857DSL is able to
support.
Num
CLKOUT
CLKOUT
I39
I40
I41
I42
I43
IRQx
IRQx
Figure 24. Interrupt Detection Timing for External Level Sensitive Lines
Figure 25. Interrupt Detection Timing for External Edge Sensitive Lines
IRQx valid to CLKOUT rising edge (set up time)
IRQx hold time after CLKOUT
IRQx pulse width low
IRQx pulse width high
IRQx edge-to-edge time
MPC862/857T/857DSL Hardware Specifications
Freescale Semiconductor, Inc.
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Characteristic
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Table 8. Interrupt Timing
1
I39
I43
I41
I40
4xT
I43
CLOCKOUT
6.00
2.00
3.00
3.00
Min
All Frequencies
I42
Max
MOTOROLA
Unit
ns
ns
ns
ns
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