MPC8280 datasheet(202/1386 Pages) FREESCALE

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System Interface Unit (SIU)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

4-30

Freescale Semiconductor

Table 4-10 describes PPC_ACR fields.

4.3.2.3

60x Bus Arbitration-Level Registers (PPC_ALRH/PPC_ALRL)

The 60x bus arbitration-level registers, shown in Figure 4-23 and Figure 4-24, define arbitration priority

of MPC8280 bus masters. Priority field 0 has highest-priority. For information about MPC8280 bus master

indexes, see the description of PPC_ACR[PRKM] in Table 4-10.

Table 4-10. PPC_ACR Field Descriptions

Bits

Name

Description

0–1

—

Reserved, should be cleared.

DBGD

Data bus grant delay. Specifies the minimum number of data tenure wait states for 60x bus

master-initiated data operations. This is the minimum delay between TS and DBG.

0DBG is asserted with TS if the data bus is free.

1DBG is asserted one cycle after TS if the data bus is not busy.

See Section 8.5.1, “Data Bus Arbitration.”

EARB

External arbitration.

0 Internal arbitration is performed. See Section 8.3.1, “Arbitration Phase.”

1 External arbitration is assumed.

4–7

PRKM

Parking master.

0000 CPM high request level refers to the IDMA which involves peripherals and the following serial

channels (SCC, SPI, SMC, and I2C)

0001 CPM middle request level refers to all other serial channels (FCCs and MCCs)

0010 CPM low request level: it is possible to change the request level for all FCCs and MCCs to low

priority when PPC_ACR[4–7] = 0010 and FCRx[1] = 1 (See Section 30.7.1, “FCC Function

Code Registers (FCRx).”)

0011 PCI request level. Reserved on all other devices.

0100 Reserved

0101 Reserved

0110 Internal core

0111 External master 1

1000 External master 2

1001 External master 3

Values 1010–1111 are reserved.

Field

Priority Field 0

Priority Field 1

Priority Field 2

Priority Field 3

Reset

0000

0001

0010

0110

R/W

Addr

0x1002C

Field

Priority Field 4

Priority Field 5

Priority Field 6

Priority Field 7

Reset

0011

0100

0101

0111

R/W

Addr

0x1002E

Figure 4-23. PPC_ALRH

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