MPC8533EVTAQGA Freescale Semiconductor, MPC8533EVTAQGA Datasheet - Page 281

• Manufacturer Part Number: MPC8533EVTAQGA
• Description: MPU POWERQUICC 783-PBGA
• Manufacturer: Freescale Semiconductor

Specifications of MPC8533EVTAQGA

• Processor Type: MPC85xx PowerQUICC III 32-Bit
• Speed: 1.0GHz
• Voltage: 0.95 V ~ 1.05 V
• Mounting Type: Surface Mount
• Package / Case: 783-BBGA, FCBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

7.3.1.2
The device supports allocating and locking L2 cache lines from external agents such as PCI. This
functionality is called stashing. Four sets of registers are provided to support this feature; each set has three
registers that specify a programmed memory range that can be locked with a snoop write transaction. All
three registers in a set must be configured in order to use an external write address.
These registers are the L2 cache external write address registers 0–3 (L2CEWARn), the L2 cache external
write address registers extended address 0–3 (L2CEWAREAn), and the L2 cache external write control
registers 0–3 (L2CEWCRn). L2CEWARn contain the lower 24 bits of the external write base address and
L2CEWAREAn contain the upper 4 bits. The base address specified in the address registers must be
naturally aligned to the window size in the corresponding control register.
Further details on the locations and fields of these registers are given in the following sections.
7.3.1.2.1
The L2CEWARn registers contain the lower 24 bits of the 28-bit L2 cache external write base address.
Each of these registers has identical fields, as shown in
Freescale Semiconductor
30–31
Bits
Offset 0x2_0010
29
Reset
W
R
L2STASHCTL
0x2_0020
0x2_0030
0x2_0040
0
Name
—
MPC8533E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
L2 Cache External Write Registers
L2 Cache External Write Address Registers 0–3 (L2CEWAR n )
Figure 7-8. Cache External Write Address Registers (L2CEWAR n )
Reserved
L2 stash configuration. This field reserves regions of the cache for stash-only operation. That is, blocks
of each cache set are reserved so that they can only be allocated for stash data. If such a region is
created, processor reads and writes will not be allocated into this region; it can only be populated by
stash writes. Similarly, stash writes will only be allocated into this region. This prevents processor and
stashed I/O data from polluting one another.
00 No stash-only region. Stashed writes will be allocated across the entire cache and can evict
01 One half of the array is a stash-only cache (way4, way5, way6 & way7 of each set)
10 One quarter of the array is a stash-only cache (way6 & way7 of each set)
11 One eighth of the array is a stash-only cache (way7 of each set)
Like L2SRAM configuration, stash-only regions subtract from the amount of the on-chip memory that
is available to the processor as cache. If the L2SRAM configuration uses the entire on-chip memory
array as SRAM, then no stash-only region can be created.
To change these bits, the L2 must be disabled (L2CTL[L2E] = 0). This field has no effect if the
L2STASHDIS bit is set.
processor data and can be evicted by processor data.
Table 7-4. L2CTL Field Descriptions (continued)
ADDR
All zeros
Figure
Description
7-8.
23 24
L2 Look-Aside Cache/SRAM
Access: Read/Write
—
7-13
31