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參數(shù)資料
| 型號(hào)： | M68060 |
| 廠(chǎng)商： | Motorola, Inc. |
| 英文描述： | M68060 User Manual |
| 中文描述： | M68060用戶(hù)手冊(cè) |
| 文件頁(yè)數(shù)： | 186/416頁(yè) |
| 文件大小： | 1451K |
| 代理商： | M68060 |
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Bus Operation
MOTOROLA
M68060 USER’S MANUAL
7-31
When the processor recognizes TA at the end of the last read transfer for the locked bus
cycle, it negates TIP during the first half of the next clock.
Clock Idle (CI)
The processor does not assert any new control signals during the idle clock states, but it
may begin the modify portion of the sequence at this time. The R/W signal remains in the
read mode until C3 to prevent bus conflicts with the preceding read portion of the cycle
and the data bus is not driven until C4.
Clock 3 (C3)
During C3, the processor places valid values on the address bus and transfer attributes
and drives R/W low for a write cycle. The processor asserts TS to indicate the beginning
of a bus cycle. The TIP signal is also asserted at this time to indicate that a bus cycle is
active. LOCKE is asserted during C3 for the last write bus cycle of the locked sequence.
If multiple write transfers are required for misaligned operands or multiple operands,
LOCKE is asserted only for the final write transfer.
The processor pre-conditions the data bus during C3 to improve AC timing. The process
of pre-conditioning involves reinforcing the logic level that is already at the data pin. If the
voltage level is originally zero volts, nothing is done; if the voltage level is 3.3 V, that volt-
age level is reinforced; however, if the voltage level is originally 5 V, the processor drives
that data pin from 5 V down to 3.3 V. Note that no active logic change is done at this time.
The actual logic level change is done in C4. This pre-conditioning affects operation prima-
rily when using the processor in a 5-V system.
Clock 4 (C4)
During C4, the processor negates TS and drives the appropriate bytes of the data bus with
the data to be written. All other bytes are driven with undefined values. The selected de-
vice uses R/W
,
SIZ1, SIZ0, A1, and A0 or BSx, to register the information on the data bus.
Any or all of the data bus bytes (D31–D24, D23–D16, D15–D8, and D7–D0) are selected
by SIZ1, SIZ0, A1, and A0 or BSx. Concurrently, the selected device asserts TA. Assum-
ing that the acknowledge termination ignore state capability is disabled, the processor
samples the level of TA; if TA is asserted, the bus cycle terminates. If TA is not recognized
asserted at the end of C4, the processor appends a wait state instead of terminating the
transfer. The processor continues to sample the TA signal on successive rising edges of
BCLK until it is recognized asserted.
When the processor recognizes TA at the rising edge of BCLK, the bus cycle is terminat-
ed, but TIP remains asserted if the processor is ready to begin another bus cycle. Other-
wise, the processor negates TIP during the next clock. The processor also three-states
the data bus during the next clock following termination of the write cycle. When the last
write transfer is terminated, LOCKE is negated. The processor also negates LOCK if the
next bus cycle is not a read-modify-write operation.
7.7.6 Emulating CAS2 and CAS Misaligned
The CAS2 and CAS (with misaligned operands) are not supported in hardware by the
MC68060. If these instructions are encountered, an unimplemented integer exception is
taken. Once the opcode for a CAS2 or CAS is decoded, the MOVEC instruction to the
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