mpc2605 Micro Electronics Corporation, mpc2605 Datasheet - Page 20

• Manufacturer Part Number: mpc2605
• Description: Integrated Secondary Cache Powerpc Microprocessors
• Manufacturer: Micro Electronics Corporation

READ/WRITE MISS
that causes the MPC2605 to replace a dirty line. L2 BR is
asserted two clocks after TS. The dirty data to be replaced is
moved into the internal cast out buffer (COB) at the same
time the new data is written into the cache. Note that the
MPC2605
DH0 – DH31,
20
DL0 – DL31
L2 CLAIM
CPU DBG
Figure 6 is an illustration of a processor read or write miss
A0 – A31
CPU BG
L2 DBG
L2 BG
L2 BR
AACK
TBST
DBB
CLK
TS
TA
LEGEND
Signal driven to the MPC2605
Signal driven by the MPC2605
High–Z
1
Figure 6. Read or Write Miss Followed by Castout
A
2
A1
3
A2
4
A3
copyback operation occurs after the processor request is
satisfied. In addition, no delay is added to the processor
transaction. It proceeds as fast as the memory controller will
allow.
5
6
A4
7
B
B1
8
9
B2
10
B3
MOTOROLA
11
B4
12