MC68LC040RC25A Datasheet, PDF (160/442 Pages) Freescale Semiconductor, Inc – M68040 Users Manual

Freescale Semiconductor, Inc.
PROCESSOR
ADDRESS 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
3) RECOGNIZE TBI ASSERTED
ADDRESS DEVICE
1) INCREMENT ADDRESS BITS A3, A2 AND DRIVE
NEW ADDRESS ON A31–A0
2) DRIVE SIZE ON SIZ1, SIZ0 (LONG WORD)
3) ASSERT TRANSFER START (TS) FOR ONE CLOCK
ACQUIRE DATA
1) LATCH DATA
UNTIL THREE LONG WORDS
TRANSFERRED
WHEN THREE LONG WORDS
TRANSFERRED
END OF LINE TRANSFER
1) NEGATE TIP (IF REQUIRED)
EXTERNAL DEVICE
PRESENT DATA
1) DECODE ADDRESS
2) PLACE DATA ON D31–D0
3) ASSERT TA AND TBI
TERMINATE CYCLE
1) REMOVE DATA FROM D31–D0
2) NEGATE TA
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
START NEXT CYCLE
Figure 7-12. Burst-Inhibited Line Read Transfer Flowchart
7-18
M68040 USER’S MANUAL
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