MC68030FE20C Freescale Semiconductor, MC68030FE20C Datasheet - Page 198

• Manufacturer Part Number: MC68030FE20C
• Description: IC MPU 32BIT ENHANCED 132-CQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68030FE20C

• Processor Type: M680x0 32-Bit
• Speed: 20MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 132-CQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

7.3.2 Asynchronous Write Cycle
MOTOROLA
two read cycles with no idle time) for a 32-bit port, Figure 7-26 shows byte
The following figures show the functional write cycle timing diagrams spec-
and word write cycles to a 32-bit port. Figure 7-27 shows a long-word write
cycle to an 8-bit port. Figure 7-28 shows a long-word write cycle to a 16-bit
During a write cycle, the processor transfers data to memory or a peripheral
device.
Figure 7-24 is a flowchart of a write cycle operation for a long-word transfer.
ified in terms of clock periods. Figure 7-25 shows two write cycles (between
port.
101 ASSERT DATA STROBE In]
2)
3) DRIVE FUNCTION CODE ON FCO-FC2
41 DRIVE SIZE {SIZO-SIZ1) (FOUR BYTES;
6) CACHE INHIBIT OUT rCIOUT) BECOMES VALID
1) ASSERT ECS/OCS FOR ONE-HALF CLOCK
St SET R/W TO WRITE
7) ASSERT ADDRESS STROBE (~)
8) ASSERT DATA BUFFER ENABLE (DBENI
9) DRIVE DATA LINES DO-D31
2) REMOVE DATA FROM 00-03'
3) NEGATE DBEN
I) NEGATE AS AND DS
DRIVE ADDRESS ON AO-A3]
TERMINATE OUTPUT TRANSFER
Figure 7-24. Asynchronous Write Cycle Flowchart
START NEXT CYCLE
AODRESS DEVICE
PROCESSOR
MC68030 USER'S MANUAL
2) STORE DATA FROM O0-D31
3) ASSERT DATA TRANSFER AND SIZE ACKNOWLEDGE ( ~ I
]) NEGATE OSAOKx
]~ DECODE ADDRESS
EXTERNAL DEVICE
TERMINATE CYCLE
ACCEPT DATA
7-37
IB