MPC8280 datasheet(184/1386 Pages) FREESCALE

184 / 1386 page

System Interface Unit (SIU)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

4-12

Freescale Semiconductor

Notice the lack of SDMA interrupt sources, which are reported through each individual FCC, SCC, SMC,

SPI, or I2C channel. The only true SDMA interrupt source is the SDMA channel bus error entry that is

reported when a bus error occurs during an SDMA access. There are two ways to add flexibility to the table

of CPM interrupt priorities—the FCC, MCC, and SCC relative priority option, described in

Section 4.2.2.1, “SCC, FCC, and MCC Relative Priority,” and the highest priority option, described in

Section 4.2.2.3, “Highest Priority Interrupt.”

4.2.2.1

SCC, FCC, and MCC Relative Priority

The relative priority between the four SCCs, three FCCs, and MCC is programmable and can be changed

dynamically. In Table 4-2 there is no entry for SCC1–SCC4, MCC1–MCC2, FCC1–FCC3, but rather there

are entries for XCC1–XCC8 and YCC1–YCC8. Each SCC can be mapped to any YCC location and each

FCC and MCC can be mapped to any XCC location. The SCC, FCC, and MCC priorities are programmed

in the CPM interrupt priority registers (SCPRR_H and SCPRR_L) and can be changed dynamically to

implement a rotating priority.

In addition, the grouping of the locations of the YCC entries has the following two options

•

Group. In the group scheme, all SCCs are grouped together at the top of the priority table, ahead

of most other CPM interrupt sources. This scheme is ideal for applications where all SCCs, FCCs,

and MCCs function at a very high data rate and interrupt latency is very important.

YCC6 (Spread)

Yes

Parallel I/O–PC4

XSIU7 (GSIU = 1)

No (TMCNT,PIT,PCI = Yes)

IDMA4

Yes

SPI

Yes

Parallel I/O–PC3

Parallel I/O–PC2

SMC1

Yes

YCC7 (spread)

Yes

SMC2

Yes

Parallel I/O–PC1

Parallel I/O–PC0

XSIU8 (GSIU = 1)

No (TMCNT,PIT,PCI = Yes)

YCC8(spread)

Yes

Reserved

—

Table 4-2. Interrupt Source Priority Levels (continued)

Priority Level

Interrupt Source Description

Multiple Events

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