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Bus Operation
7-68 M68060 USER’S MANUAL MOTOROLA
7.12 BUS SNOOPING OPERATION
The MC68060 has the capability of monitoring bus transfers by other bus masters. The pro-
cess of bus monitoring is called snooping and is controlled by the SNOOP signal.
Snooping can occur when the bus is granted to another bus master, and the MC68060 sees
a TS assertion by the alternate master. If SNOOP is asserted, the processor registers the
value of the A31–A0 and TT1 signals on the rising edge of BCLK in which TS is asserted.
Figure 7-44. Arbitration During Relinquish and Retry Timing
BCLK
D31–D0
TS
TA
ALTERNATE
MASTER
PROCESSOR
BR
BG
BB
C1 C2 C3 C4 C5 C8C6 C7
TEA
R/W
PROCESSOR
*
AM indicates the alternate bus master.
NOTE: The MC68040 acknowledge termination mode is assumed.
BTT
EX-OWN EX-OWN END-TEN AM-IMP AM-EX EX-OWNAM-EX EX-OWN
A31–A0
BUS
ARBITRATION
STATE
TRANSFER
ATTRIBUTES
AM_BR*
AM_BG*
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