MPC8536DS Freescale Semiconductor, MPC8536DS Datasheet - Page 251

• Manufacturer Part Number: MPC8536DS
• Description: BOARD DEV SYSTEM MPC8536E
• Manufacturer: Freescale Semiconductor
• Series: PowerQUICC III™r
• Type: MPUr

Specifications of MPC8536DS

• Contents: Board, Software and Documentation
• Processor Series: MPC85xx
• Core: e500
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 667 MHz
• Operating Supply Voltage: - 0.3 V to + 1.21 V
• Maximum Operating Temperature: + 105 C
• Data Ram Size: 32 KB
• Interface Type: SPI, USB
• Program Memory Type: DDR2, DDR3, SDRAM
• Core Size: 32 Bit
• Program Memory Size: 544KB
• Cpu Speed: 1.5GHz
• Digital Ic Case Style: BGA
• No. Of Pins: 783
• Supply Voltage Range: 0.95V To 1.05V
• Rohs Compliant: Yes
• For Use With/related Products: MPC8536
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.7.5
Locks for instructions and data are recorded separately in the L2 cache, and they can be flash cleared
separately by writing the appropriate value to the L2 cache control register (L2CTL[L2LFR] and
L2CTL[L2LFRID]). Flash invalidating of the L2 (setting L2CTL[L2I]) clears all locks on both
instructions and data.
Note that flash clearing is the only way to clear data locks without clearing instruction locks, or to clear
instruction locks without clearing data locks. All instructions and snoop transactions that clear locks clear
both data and instruction locks.
6.7.6
If data is locked in the L2 and either the e500 core performs a cacheable copyback store or a dcbtst misses
in the L1, the L2 invalidates the line; however, the L2 clears the valid bit for the data, the lock remains,
and the line cannot be victimized. If the e500 core casts out modified data or pushes it in response to a
non-flush snoop, the L2 updates the data and sets the valid bit again, maintaining the lock and keeping the
data in the cache hierarchy.
6.8
Line replacement is determined using a pseudo least-recently-used (PLRU) algorithm. There is a valid bit
(V0–V7) for each line. To determine the replacement victim (the line to be cast out), there are seven PLRU
bits (P0–P6) for each set. PLRU bits are updated every time a new line is allocated and every time an
existing line is read by the processor, updated by a write, or invalidated.
Figure 6-26
are labeled W0–W7; the seven PLRU bits are labeled P0–P6.
Freescale Semiconductor
PLRU L2 Replacement Policy
shows the binary decision tree used to generate the victim line. The eight ways of the L2 cache
Flash Clearing of Instruction and Data Locks
Locks with Stale Data
MPC8536E PowerQUICC III Integrated Processor Reference Manual, Rev. 1
P0
P1
P2
P3
P4
P5
P6
Allocate
Yes
W0
Figure 6-26. L2 Cache Line Replacement Algorithm
0
0
x
0
x
x
x
P3 = 0?
Allocate
Yes
W1
No
0
0
x
1
x
x
x
P1 = 0?
Allocate
W2
Yes
0
1
0
x
x
x
x
P4 = 0?
Yes
No
Allocate
W3
0
1
1
No
x
x
x
x
P0 = 0?
Allocate
Yes
W4
P5 = 0?
1
0
0
x
x
x
x
No
Yes
Allocate
No
W5
1
0
1
x
x
x
x
P2 = 0?
Allocate
Yes
W6
1
x
1
x
x
x
0
P6 = 0?
No
Allocate
W7
No
1
x
1
x
x
x
1
L2 Look-Aside Cache/SRAM
6-31