MC68LC040RC25A Datasheet, PDF (165/442 Pages) Freescale Semiconductor, Inc – M68040 Users Manual

Freescale Semiconductor, Inc.
PROCESSOR
ADDRESS DEVICE
1) SET R/W TO WRITE
2) DRIVE ADDRESS ON A31–A0
3) DRIVE USER PAGE ATTRIBUTES ON UPA1, UPA0
4) DRIVE SIZE ON SIZ1, SIZ0 (LINE)
5) DRIVE TRANSFER TYPE ON TT1, TT0
6) DRIVE TRANSFER MODIFIER ON TM2–TM0
7) CIOUT BECOMES VALID
8) ASSERT TS FOR ONE CLOCK
9) ASSERT TIP
EXTERNAL DEVICE
SUPPLY DATA
1) DRIVE DATA ON D31–D0
2) SAMPLE TA
3) SAMPLE TBI AND TCI (FOR FIRST TRANSFER)
UNTIL FOUR LONG
WORDS TRANSFERRED
WHEN FOUR LONG
WORDS TRANSFERRED
END OF BURST
1) REMOVE DATA FROM D31–D0
2) NEGATE TIP (IF REQUIRED)
ACCEPT DATA
1) DECODE ADDRESS (FIRST TRANSFER ONLY)
2) LATCH DATA ON D31–D0
3) ASSERT TA
TERMINATE CYCLE
1) NEGATE TA (IF NECESSARY)
2) INCREMENT ADDRESS BITS A3, A2 (IF
NECESSARY)
START NEXT CYCLE
UNTIL FOUR LONG
WORDS TRANSFERRED
Figure 7-16. Line Write Transfer Flowchart
MOTOROLA
M68040 USER’S MANUAL
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