mc68ec060 Freescale Semiconductor, Inc, mc68ec060 Datasheet - Page 223

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

Bus Operation
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.
7-68
*
ARBITRATION
ATTRIBUTES
AM indicates the alternate bus master.
NOTE: The MC68040 acknowledge termination mode is assumed.
TRANSFER
Figure 7-44. Arbitration During Relinquish and Retry Timing
D31–D0
AM_BG*
AM_BR*
A31–A0
STATE
BCLK
BUS
R/W
TEA
BTT
BG
TS
TA
BR
BB
PROCESSOR
EX-OWN
C1
EX-OWN END-TEN
C2
M68060 USER’S MANUAL
C3
AM-IMP
C4
ALTERNATE
MASTER
AM-EX
C5
AM-EX
C6
EX-OWN
C7
PROCESSOR
EX-OWN
C8
MOTOROLA