MC68LC040RC25A Datasheet, PDF (156/442 Pages) Freescale Semiconductor, Inc – M68040 Users Manual

Freescale Semiconductor, Inc.
PROCESSOR
ADDRESS DEVICE
EXTERNAL DEVICE
1) SET R/W TO READ
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
ACQUIRE DATA
1) LATCH DATA
2) SAMPLE TBI AND TCI (FOR FIRST TRANSFER)
END OF BURST
1) NEGATE TIP (IF REQUIRED)
PRESENT DATA
1) DECODE ADDRESS
2) PLACE DATA ON D31–D0
3) ASSERT TA
TERMINATE CYCLE
1) REMOVE DATA FROM D31–D0
2) NEGATE TA (IF NECESSARY)
3) INCREMENT ADDRESS BITS A3, A2 (IF NECESSARY)
WHEN FOUR LONG WORDS
TRANSFERRED
UNTIL FOUR LONG WORDS
TRANSFERRED
START NEXT CYCLE
Figure 7-10. Line Read Transfer Flowchart
7-14
M68040 USER’S MANUAL
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