Freescale Semiconductor MPC8313E PowerQUICC II Pro Family Reference Manual page 342

e300 Processor Core Overview
Bits Name
7–31 — Reserved, should be cleared
Note: The clock configuration bits reflect the state of the pll_cfg[0:6] signals.
Table 7-5 shows the bit definitions for HID2.
Bits Name
0–3 — Reserved, should be cleared.
4 LET True little-endian. This bit enables true little-endian mode operation for instruction and data accesses.
This bit is set to reflect the state of the tle signal at the negation of hreset . This bit is used in
conjunction with MSR[LE] to determine the endian mode of operation.
0 No function
1 True little-endian mode, when MSR[LE] = 1
Changing the value of this bit during normal operation is not recommended
5 IFEB Instruction fetch burst extension. This bit enables the instruction fetch burst extension.
0 Instruction fetch burst extension disabled
1 Instruction fetch burst extension enabled
6 — Reserved, should be cleared.
7 MESISTATE MESI state enable. This bit enables the four-state MESI cache coherency protocol.
0 MESI disabled. The data cache uses a three-state MEI coherency protocol.
1 MESI enabled. The data cache uses a four-state MESI protocol.
8 IFEC Instruction fetch cancel extension. This bit enables the instruction fetch cancel extension.
0 Instruction fetch cancel extension disabled
1 Instruction fetch cancel extension enabled
9 EBQS Enable BIU queue sharing. This bit enables data cache queue sharing.
0 Data cache queue sharing disabled
1 Data cache queue sharing enabled
10 EBPX Enable BIU pipeline extension.This bit enables the bus interface unit pipeline extension.
0 BIU pipeline extension disabled; 1 level pipeline
1 BIU pipeline extension enabled; 1-1/2 level pipeline
11–12 — Reserved for e300c1, should be cleared.
11 ELRW Enable weighted LRU. This bit enables the use of an adjusted (weighted) LRU.
0 Normal operation.
1 The dcbt, dcbtst, and dcbz instructions use and adjusted (weighted) LRU such that they always
12 NOKS No kill for snoop. This bit enables the forcing of kill-type snoops to flush data instead of killing it.
0 Normal operation.
1 Forces write-with-kill snoops to flush instead of kill (snoop can never kill data).
13 HBE High BAT enable. Regardless of the setting of HID2[HBE], these BATs are accessible by mfspr and
mtspr.
0 IBAT[4–7] and DBAT[4–7] are disabled
1 IBAT[4–7] and DBAT[4–7] are enabled
14–15 — Reserved, should be cleared.
MPC8313E PowerQUICC™ II Pro Integrated Processor Family Reference Manual, Rev. 2
7-24
Table 7-4. HID1 Bit Descriptions (continued)
Table 7-5. e300HID2 Bit Descriptions
select and replace the lowest unlocked way in the data cache.
Description
Description
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