mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 552

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

Communication Processor Module
SOURCE BUFFER POINTER
This field contains the address of the associated source data buffer and can reside in
internal or external memory.
DESTINATION BUFFER POINTER
This field contains the address of the associated destination data buffer, which resides in
internal or external memory.
The terminal count code AT = 0xF replaces the normal SFCR and DFCR code for the last
IDMA cycle on the peripheral side.
16.6.3.6 IDMA COMMANDS. There are three IDMA commands:
• INIT_IDMA—This command causes the RISC microcontroller to reinstall its IDMA
• ARM_IDMA—This command causes the IDMA to open the next buffer descriptor in the
• STOP_IDMA—This command causes the RISC microcontroller to terminate current
internal state to the condition it was in after a system reset. The IDMA buffer descriptor
pointer is reinitialized to the top of the buffer descriptor ring.
table. It can be used to reduce the latency of servicing the first IDMA request.
IDMA transfers. The DONE bit is set in the IDSRx and the current buffer descriptor is
closed. If the peripheral device is the source, the IDMA internal buffer is transferred to
memory before termination. At the next request, the following buffer descriptor in the
chain is processed.
Note: In single address mode when the source is a device, the SOURCE BUFFER
Note: In single address mode when the destination is a device, the DESTINATION
POINTER field is ignored. In dual address mode when the source is a device,
this field must contain the device address.
BUFFER POINTER field is ignored. In dual address mode when the destination
is a device, this field must contain the device address.
Freescale Semiconductor, Inc.
For More Information On This Product,
MPC823 REFERENCE MANUAL
Go to: www.freescale.com
MOTOROLA