28-20
MPC8260 PowerQUICC II UserÕs Manual
MOTOROLA
Part IV. Communications Processor Module
28.12.1 FCC Transmitter Full Sequence
For the FCC transmitter, the full disable and enable sequence is as follows.
1. Issue the
STOP
TRANSMIT
command. This is recommended if the FCC is currently
transmitting data because it stops transmission in an orderly way. If the FCC is not
transmitting (no TxBDs are ready or the
GRACEFUL
STOP
TRANSMIT
command has
been issued and completed), then the
STOP
TRANSMIT
command is not required.
Furthermore, if the TBPTR is overwritten by the user or the
INIT
TX
PARAMETERS
command is executed, this command is not required.
2. Clear GFMR[ENT]. This disables the FCC transmitter and puts it in a reset state.
3. Make changes. The user can modify FCC transmit parameters, including the
parameter RAM. To switch protocols or restore the FCC transmit parameters to their
initial state, the
INIT
TX
PARAMETERS
command must be issued.
4. If an
INIT
TX
PARAMETERS
command was not issued in step 3, issue a
RESTART
TRANSMIT
command.
5. Set GFMR[ENT]. Transmission begins using the TxBD that the TBPTR points to as
soon as TxBD[R] = 1.
28.12.2 FCC Transmitter Shortcut Sequence
A shorter sequence is possible if the user prefers to reinitialize the transmit parameters to
the state they had after reset. This sequence is as follows:
1. Clear GFMR[ENT].
2. Issue the
INIT
TX
PARAMETERS
command. Any additional changes can be made now.
3. Set GFMR[ENT].
28.12.3 FCC Receiver Full Sequence
The full disable and enable sequence for the receiver is as follows:
1. Clear GFMR[ENR]. Reception is aborted immediately, which disables the receiver
of the FCC and puts it in a reset state.
2. Make changes. The user can modify the FCC receive parameters, including the
parameter RAM. If the user prefers to switch protocols or restore the FCC receive
parameters to their initial state, the
INIT
RX
PARAMETERS
command must be issued.
3. Issue the
ENTER
HUNT
MODE
command. This command is required if the
INIT
RX
PARAMETERS
command was not issued in step 2.
4. Set GFMR[ENR]. Reception begins immediately using the RxBD that the RBPTR
points to if RxBD[E] = 1.
Содержание MPC8260 PowerQUICC II
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