MPC850DSL datasheet(31/72 Pages) FREESCALE

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MPC850 PowerQUICC™ Integrated Communications Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

Bus Signal Timing

Table 7 provides interrupt timing for the MPC850.

Figure 22 provides the interrupt detection timing for the external level-sensitive lines.

Figure 22. Interrupt Detection Timing for External Level Sensitive Lines

Figure 23 provides the interrupt detection timing for the external edge-sensitive lines.

Figure 23. Interrupt Detection Timing for External Edge Sensitive Lines

Table 7. Interrupt Timing

Num

Characteristic 1

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 MPC850 is able to support

50 MHz

66MHz

80 MHz

Unit

Min

Max

Min

Max

Min

Max

I39

IRQx valid to CLKOUT rising edge (set up time)

6.00

—

6.00

—

6.00

—

I40

IRQx hold time after CLKOUT.

2.00

—

2.00

—

2.00

—

I41

IRQx pulse width low

3.00

—

3.00

—

3.00

—

I42

IRQx pulse width high

3.00

—

3.00

—

3.00

—

I43

IRQx edge-to-edge time

80.00

—

121.0

—

100.0

—

CLKOUT

IRQx

I39

I40

CLKOUT

IRQx

I39

I41

I42

I43

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