MPC823 datasheet(34/74 Pages) MOTOROLA

34 / 74 page

Communication Processor Module

16-412

MPC823 REFERENCE MANUAL

MOTOROLA

16.11.7.6 SMCx TRANSPARENT CONTROLLER PARAMETER RAM MEMORY MAP.

There is no protocol-specific parameter RAM for the SMCx Transparent controller. Only the

general SMCx parameter RAM is used. See Section 16.11.4 SMC General Parameter

RAM Memory Map for more information.

16.11.7.7 SMCx TRANSPARENT COMMANDS. You can program the CPCR (described

in Section 16.2.6.1 CPM Command Register) with the following commands to transmit

data.

• STOP TRANSMIT—After the hardware or software is reset and the channel is enabled

in the SMCM–Transparent register, the channel is in transmit enable mode and starts

polling the first buffer descriptor in the table. This command disables the transmission

of frames on the transmit channel. If the transparent controller receives this command

while transmitting a frame, it stops after the contents of the FIFO are transmitted (up to

2 characters). The TBPTR is not advanced to the next buffer descriptor, no new buffer

descriptor is accessed, and no new buffers are transmitted for this channel. The

transmitter sends idles until the RESTART TRANSMIT command is issued.

• RESTART TRANSMIT—This command is used to begin or continue transmission from

the current TBPTR in the channel’s TX buffer descriptor table. When the channel

receives this command, it starts polling the R bit in the TX buffer descriptor. A serial

management controller expects this command after a STOP TRANSMIT command is

issued and the channel in the SMCMR is disabled or after a transmitter error occurs.

• INIT TX PARAMETERS—This command initializes all the transmit parameters in this

serial channel parameter RAM to their reset state and must only be issued when the

transmitter is disabled. The INIT TX AND RX PARAMS command can also be used to

reset the transmit and receive parameters.

You can program the CPCR with the following commands to receive data.

• ENTER HUNT MODE—This command forces a serial management controller to close

the current receive buffer descriptor if it is currently being used and to use the next

buffer descriptor in the list for any subsequently received data. If a serial management

controller is not in the process of receiving data, the buffer is not closed. Additionally,

this command causes the receiver to wait for a resynchronization before further

reception continues.

• CLOSE RX BD—This command is used to force a serial management controller to

close the current receive buffer descriptor if it is being used and to use the next buffer

descriptor in the list for any subsequently received data. If a serial management

controller is not in the process of receiving data, no action is taken by this command.

• INIT RX PARAMETERS—This command initializes all the receive parameters in this

serial channel’s parameter RAM to their reset state. It must only be issued when the

receiver is disabled. The INIT TX AND RX PARAMS command can also be used to

reset the receive and transmit parameters.

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