Processor Users Manual

4-30 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA
Part II. ConÞguration and Reset
Table 4-11 describes LCL_ACR register bits.
4.3.2.5 Local Bus Arbitration Level Registers (LCL_ALRH and
LCL_ACRL)
The local bus arbitration level registers (LCL_ALRH and LCL_ALRL), shown in
Figure 4-26 and Figure 4-27, deÞnes arbitration priority for MPC8260 local bus masters 0Ð
7. Priority Þeld 0 has highest-priority. For information about the MPC8260 local bus master
indexes see LCL_ACR[PRKM] in Table 4-11.
LCL_ALRL, shown in Figure 4-27, deÞnes arbitration priority of MPC8260 local bus
masters 8Ð15.
Table 4-11. LCL_ACR Field Descriptions
Bits Name Description
0Ð1 Ñ Reserved, should be cleared.
2 DBGD Data bus grant delay. SpeciÞes the minimum number of data tenure wait states for PowerPC
master-initiated data operations. This is the minimum delay between TS
and DBG.
0 DBG
is asserted with TS if the data bus is free.
1 DBG
is asserted one cycle after TS if the data bus is not busy.
See Section 8.5.1, ÒData Bus Arbitration.Ó
3 Ñ Reserved, should be cleared.
4Ð7 PRKM Parking master. DeÞnes the parked master.
0000 CPM high request level
0001 CPM middle request level
0010 CPM low request level (default)
0011 Host bridge
Values 0100Ð1111 are reserved.
Bit 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Field Priority Field 0 Priority Field 1 Priority Field 2 Priority Field 3
Reset 0000 0001 0010 0011
R/W R/W
Addr 0x10038
Bit 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Field Priority Field 4 Priority Field 5 Priority Field 6 Priority Field 7
Reset 0100 0101 0110 0111
R/W R/W
Addr 0x10040
Figure 4-26. LCL_ALRH