MC68306 Motorola, MC68306 Datasheet - Page 34

• Manufacturer Part Number: MC68306
• Description: Integrated EC000 Processor
• Manufacturer: Motorola

The word read cycle flowchart is shown in Figure 3-1. The byte read cycle flowchart is
shown in Figure 3-2. The read and write cycle timing is shown in Figure 3-3. Figure 3-4
shows the word and byte read cycle timing diagram.
3-2
1) SET R/W TO READ
2) PLACE FUNCTION CODE ON FC2–FC0
3) PLACE ADDRESS ON ADDRESS BUS
4) ASSERT ADDRESS STROBE (AS)
5) ASSERT UPPER DATA STROBE (UDS)
1) SET R/W TO READ
2) PLACE FUNCTION CODE ON FC2–FC0
3) PLACE ADDRESS ON ADDRESS BUS
4) ASSERT ADDRESS STROBE (AS)
5) ASSERT UPPER DATA STROBE (UDS)
1) LATCH DATA
2) NEGATE UDS AND LDS
3) NEGATE AS
1) LATCH DATA
2) NEGATE UDS AND LDS
3) NEGATE AS
OR LOWER DATA STROBE (LDS)
(BASED ON A0)
AND LOWER DATA STROBE (LDS)
ADDRESS THE DEVICE
ADDRESS THE DEVICE
ACQUIRE THE DATA
ACQUIRE THE DATA
START NEXT CYCLE
START NEXT CYCLE
BUS MASTER
BUS MASTER
Figure 3-1. Word Read Cycle Flowchart
Figure 3-2. Byte Read Cycle Flowchart
MC68306 USER'S MANUAL
1) DECODE ADDRESS
2) PLACE DATA ON D7–D0 OR D15–D8
3) ASSERT DATA TRANSFER
1) REMOVE DATA FROM D7–D0
2) NEGATE DTACK
1) DECODE ADDRESS
2) PLACE DATA ON D15–D0
3) ASSERT DATA TRANSFER
1) REMOVE DATA FROM D15–D0
2) NEGATE DTACK
OR D15–D8
(BASED ON UDS OR LDS)
ACKNOWLEDGE (DTACK)
ACKNOWLEDGE (DTACK)
TERMINATE THE CYCLE
TERMINATE THE CYCLE
OUTPUT THE DATA
OUTPUT THE DATA
SLAVE
SLAVE
MOTOROLA