mc68ec060 Freescale Semiconductor, Inc, mc68ec060 Datasheet - Page 210

• Manufacturer Part Number: mc68ec060
• Description: Mc68060 Superscalar 68k Microprocessor Including The Lc060 And Ec060
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
NOTES:
Present
Explicit
Tenure
Implicit
Explicit
Implicit
Snoop
Reset
State
Own
Own
End
Any
AM
AM
1) “N” means negated; “A” means asserted.
2) End of Cycle: Whatever terminates a bus transaction whether it is normal, bus error, or retried. Note that ong-word
3) Conditions C4, C5, and F4 indicate that an alternate master has taken ownership without sampling BB as negated.
4) IBR refers to an internal bus request. The output signal BR is a registered version of IBR.
5) BBI refers to BB when sampled as an input.
6) SNOOP denotes the condition in which SNOOP is sampled asserted and TT1 = 0.
7) In this state diagram, BGR is assumed always asserted, hence, bus cycles within a locked sequence are treated no
8) The processor does not require a valid acknowledge termination for snooped accesses. The only restriction is that
bus cycles that result from a burst-inhibited line transfer are considered part of that original line transfer.
differently from nonlocked bus cycles, except that the processor takes an extra BCLK period in the end tenure state
to allow for LOCK and LOCKE to negate. If BGR is negated and a locked sequence is in progress, the processor
does not relinquish the bus if BG is negated until the end of the last bus cycle in the locked sequence.
a snoop cycle be performed at no more than a maximum rate of once every two BCLK cycles. This state diagram
properly emulates this behavior.
Condition RSTI BG
Table 7-6. MC68040-Arbitration Protocol Transition Conditions
C1
C2
C3
C4
C5
D1
D2
D3
D4
D5
D6
G1
A1
A2
A3
B1
B2
B3
B4
E1
E2
E3
E4
E5
E6
F1
F2
F3
F4
—
A
A
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
A
—
—
—
—
—
—
—
—
A
N
N
N
N
A
N
A
A
N
N
N
A
A
A
A
A
N
N
A
A
N
sampled
as an
input
TSI
TS
—
—
—
—
—
—
—
—
—
—
—
—
—
—
N
A
A
A
N
N
N
N
A
A
N
N
N
N
N
A
M68060 USER’S MANUAL
SNOOP
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
N
N
A
A
sampled
as an
input
(BBI)
BB
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
N
—
N
N
N
N
N
A
A
A
Request
Internal
(IBR)
Bus
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
N
A
N
A
N
A
N
A
Transfer in
Progress?
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
N
A
A
Cycle?
End of
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
N
A
Bus Operation
Implicit Own
Explicit Own
Explicit Own
Implicit Own
Explicit Own
Implicit Own
Explicit Own
Implicit Own
Explicit Own
Implicit Own
Explicit Own
End Tenure
End Tenure
Next State
AM Implicit
AM Implicit
AM Explicit
AM Implicit
AM Explicit
AM Explicit
AM Explicit
AM Implicit
AM Implicit
AM Explicit
Violation
Violation
Violation
Snoop
Snoop
Reset
Reset
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