MPC8280 datasheet(924/1386 Pages) FREESCALE

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Multi-Channel Controllers (MCCs)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

29-34

Freescale Semiconductor

29.8

MCC Exceptions

The MCC interrupt reporting scheme has two levels. The circular interrupt tables (illustrated in

Figure 29-18) report channel-specific events and are masked by each channel’s INTMSK field located in

channel-specific parameter RAM. The MCCE global event register (described in Section 29.8.1, “MCC

Event Register (MCCE)/Mask Register (MCCM)”) reports some global-level events and whether new

activity has taken place in any of that MCC’s interrupt tables. These events can be masked by the MCCM.

Table 29-17. MCC Commands

Command

Description

INIT RX AND TX

Performs both INIT RX and INIT TX commands contiguously, using the channel number supplied

with the command.

INIT RX

Initializes MCC receive FIFOs in groups of 32 channels, starting with the channel number

programmed in the CPCR[MCN] field when the command is issued. This command should only be

issued when the channels are disabled. To initialize more than 32 channels, reissue the command

with the appropriate channel numbers. The INIT TX AND RX command may be used to initialize

both the receive and transmit sides of an MCC channel at the same time. Note that this command

will initialize the first 16 FIFOs to be preloaded with 16 bits of idle, and the second set of FIFOs will

be completely empty and ready for data. This is done to stagger when FIFOs require servicing and

spread out CPM loading.

INIT TX

1 The INIT PARAMETERS style commands are also used to reset the MCC channel FIFOs and these commands need to

be issued to cover any channel number used, whether used normally or as part of a superchannel

Initializes MCC transmit FIFOs in groups of 32 channels, starting with the channel number

programmed in the CPCR[MCN] field when the command is issued. This command should only be

issued when the channels are disabled. To initialize more than 32 channels, reissue the command

with the appropriate channel numbers. The INIT TX AND RX command may be used to initialize

both the receive and transmit sides of an MCC channel at the same time. Note that this command

will initialize the first 16 FIFOs to be preloaded with 16 bits of idle, and the second set of FIFOs will

be preloaded with 32 bits of idle. This is done to stagger when FIFOs require servicing and spread

out CPM loading.

INIT TX AND RX

(16 BITS)

Same as regular INIT RX AND TX, except that all FIFOs are equally preloaded with idle. For

applications in which all channels must begin sending or receiving data in the same TDM frame.

INIT TX

, ONE1

CHANNEL

Performs the INIT TX command but only for the channel number programmed in CPCR[MCN] as

opposed to initializing 32 channels at once.

INIT

RX, ONE1

CHANNEL

Performs the INIT RX command but only for the channel number programmed in CPCR[MCN] as

opposed to initializing 32 channels at once.

MCC RESET

Initializes the state machine hardware of the MCC indicated in CPCR[PAGE] and CPCR[SBC], has

the same effect on the MCC block that a CPM reset does. Required after the GUN or GOV MCC

event occurs. If this command is not available in the revision of silicon being used, a CPM reset is

required instead.

STOP TRANSMIT

Disables the transmission on the selected channel and clears CHAMR[POL]. When this command

is issued in the middle of a frame, the CP sends an ABORT indication and then idles/flags on the

selected channel. If this command is issued between frames, the CP sends only idles or flags

(depending on CHAMR[IDLM]). TBPTR points for the buffer that the CP was using when the STOP

TRANSMIT

command was issued.

STOP RECEIVE

Forces the receiver of the selected channel to terminate reception. After this command is executed,

the CP does not change the receive parameters in the dual-port RAM. The user must initialize the

channel receive parameters in order to restart reception.

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