MC68340 datasheet(419/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

11-19

11.8 DMA MODULE AC ELECTRICAL SPECIFICATIONS (See notes (a), (b), (c), and

(d) corresponding to part operation, GND = 0 Vdc, TA = 0 to 70

°C; see Figure 11-12)

3.3 V

3.3 V or 5.0 V

5.0 V

8.39 MHz

16.78 MHz

25.16 MHz

Num.

Characteristic

Min

Max

Min

Max

Min

Max

Unit

CLKOUT Low to

AS, DACK, DONE Asserted

—

CLKOUT Low to

AS, DACK Negated

—

DREQ

≈ Asserted to AS Asserted (for DMA Bus

Cycle)

3t cyc + tAIST + tCLSA

Asynchronous Input Setup Time to CLKOUT

Low

—

8, 5

—

Asynchronous Input Hold Time from CLKOUT

Low

—

AS to DACK Assertion Skew

-30

–15

–10

DACK to DONE Assertion Skew

-30

–15

–8

AS, DACK, DONE Width Asserted

200

—

100

—

AS, DACK, DONE Width Asserted (Fast

Termination Cycle)

—

NOTES:

(a) The electrical specifications in this document for both the 8.39 and 16.78 MHz @ 3.3 V

±0.3 V are preliminary

and apply only to the appropriate MC68340V low voltage part.

(b) The 16.78-MHz specifications apply to the MC68340 @ 5.0 V

±5% operation.

±5% electrical specifications are preliminary.

(d) For extended temperature parts T A = –40 to +85°C. These specifications are preliminary.

Specification #4 for 16.78 MHz @ 3.3 V

±0.3 V will be 8 ns.

DONE (INPUT)

DREQ

CLKOUT

DACK

DONE

(OUTPUT)

CPU_CYCLE

(DMA REQUEST)

DMA_CYCLE

Figure 11-12. DMA Signal Timing Diagram

Freescale Semiconductor, Inc.

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