MPC8280 datasheet(893/1386 Pages) FREESCALE

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Multi-Channel Controllers (MCCs)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

29-3

•

Channel extra parameters. Each channel use 8 bytes of extra parameters placed in the DPRAM at

offset XTRABASE + 8*CH_NUM (relative to the DPRAM base address). XTRABASE is one of

the global MCC parameters. Refer to Section 29.4, “Channel Extra Parameters.” Note that the

DPRAM memory corresponding to the inactive channels can be used for other purposes.

•

Superchannel table (used only if superchannelled timeslots are defined in SIRAM programming).

This table is placed in the DPRAM from the offset SCTPBASE (relative to the DPRAM base

address). SCTPBASE is one of the global MCC parameters. The super channel table is described

in Section 29.5.1, “Superchannel Table.”

•

BD tables placed in the external memory. All the BD tables associated with one MCC must reside

in a 512-KByte segment. The absolute base addresses of a channel BD table is MCCBASE +

8*RBASE (for the receiver) and MCCBASE + 8*TBASE (for the transmitter). MCCBASE is one

of the global MCC parameters and RBASE/TBASE are channel extra parameters. Each BD table

is a circular queue. One BD includes status bits, start address and length of a data buffer.

Figure 29-1 shows the BD structure for one MCC.

•

Circular interrupt tables placed in the external memory. There is one table for the transmitter

interrupts (base address TINTBASE) and between one and four tables for receiver interrupts (base

address RINTBASE0–RINTBASE4). TINTBASE and RINTBASE0–RINTBASE4 are global

MCC parameters.

•

Three registers (MCCE, MCCM, and MCCF) at described in Section 29.8.1, “MCC Event Register

(MCCE)/Mask Register (MCCM),” and Section 29.6, “MCC Configuration Registers (MCCFx).”

Figure 29-1. BD Structure for One MCC

Channel j TxBD

Table

Channel 0 Parameter

Channel 1 Parameter

Channel j Extra

RBASE

TBASE

Global MCC

MCCBASE

DPRAM

Buffer Descriptor

Channel j RxBD

Table

External Memory

512 Kbytes

DPRAM_base

Table Base Address

Parameter

Parameters

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