Or 5.0 39 MHz, MHz Num Characteristic Min Max

Freescale Semiconductor, Inc...

Freescale Semiconductor, Inc.

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
1	CLKOUT Low to AS, DACK, DONE Asserted	—	60	—	30	—	20	ns
2	CLKOUT Low to AS, DACK Negated	—	60	—	30	—	20	ns
3	DREQ≈ Asserted to AS Asserted (for DMA Bus		3t cyc + tAIST + tCLSA					ns
	Cycle)
41	Asynchronous Input Setup Time to CLKOUT	15	—	8, 5	—	5	—	ns
	Low
5	Asynchronous Input Hold Time from CLKOUT	30	—	15	—	10	—	ns
	Low
6	AS to DACK Assertion Skew	-30	30	–15	15	–10	10	ns
7	DACK to DONE Assertion Skew	-30	30	–15	15	–8	8	ns
8	AS, DACK, DONE Width Asserted	200	—	100	—	70	—	ns
8A	AS, DACK, DONE Width Asserted (Fast	80	—	40	—	28	—	ns
	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.

(d) For extended temperature parts T A = –40 to +85°C. These specifications are preliminary. 1. Specification #4 for 16.78 MHz @ 3.3 V ±0.3 V will be 8 ns.

		CPU_CYCLE						DMA_CYCLE
		(DMA REQUEST)						DMA_CYCLE
S0	S1	S2	S3	S4	S5	S0	S1	S2	S3	S4	S5
CLKOUT
4		5					1
DONE (INPUT)								6
DREQ								6
				3					8
									8
AS
							1				2
											2
DACK
								7
DONE
(OUTPUT)
								1

Figure 11-12. DMA Signal Timing Diagram

MOTOROLA

MC68340 USER’S MANUAL

11-19

For More Information On This Product,

Go to: www.freescale.com

MC68340 specifications

The Motorola MC68340 is a highly integrated microprocessor that was introduced in the early 1990s. It belongs to the 68000 family of microprocessors and is designed to cater to the demands of embedded systems, particularly in telecommunications and networking applications. This chip represents a significant evolution in microprocessor technology by combining a microprocessor core with additional peripherals on a single chip, making it an attractive solution for engineers looking to design compact and efficient systems.

One of the key features of the MC68340 is its 32-bit architecture, which allows for significant processing power and data handling capabilities. This architecture enables the processor to handle larger data sizes and perform more complex calculations compared to its 16-bit predecessors. The MC68340 operates at clock speeds typically ranging from 16 MHz to 25 MHz. Its dual instruction pipeline enhances throughput, allowing for simultaneous instruction fetches and executions, which significantly boosts performance.

A notable characteristic of the MC68340 is the inclusion of integrated peripherals, which help reduce the overall component count in a system. Key integrated components include a memory management unit (MMU), a direct memory access (DMA) controller, and various communication interfaces such as serial ports. The memory management capabilities enhance the processor's ability to manage memory resources efficiently, enabling it to support multitasking environments commonly found in modern computing.

In terms of connectivity, the MC68340 features connections for both synchronous and asynchronous serial communication, making it well-suited for networking tasks. The processor supports a range of bus standards, including address and data buses, which facilitate seamless interaction with peripheral devices.

Another important aspect of the MC68340 is its flexibility. The processor supports multiple operating modes, including multiple CPU configurations and compatibility with the Motorola 68000 family, allowing for easier integration into existing systems.

Moreover, the MC68340 boasts low power consumption compared to many of its contemporaries, making it an excellent choice for battery-operated applications, enhancing its appeal in sectors like telecommunications, industrial control, and automotive systems. Its combination of performance, integration, versatility, and efficiency has secured the MC68340 a reputable position in the annals of embedded systems technology, proving to be a valuable asset for developers and engineers alike.

Motorola MC68340 manual Or 5.0 39 MHz, MHz Num Characteristic Min Max

Models: MC68340

Freescale Semiconductor, Inc...

3.3 V or 5.0 V

8.39 MHz

25.16 MHz

Num.

Characteristic

Min

Max

(OUTPUT)

Figure 11-12. DMA Signal Timing Diagram

MC68340 specifications