mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 916

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

Communication Processor Module
16.13.6 The I
The data associated with the I
buffer descriptors organized in a buffer descriptor ring located in the dual-port RAM. This
ring has the same basic configuration as the serial communication and serial management
controllers.
The buffer descriptor ring forms a circular queue that helps you organize the buffers you
want to transmit or receive. Using the buffer descriptors, the communication processor
module confirms reception and transmission or indicates error conditions so that the
processor knows the buffers have been serviced. The actual buffers can reside in either
external or internal memory and the data buffers can reside in the parameter RAM area of
another controller if it is not enabled.
DUAL-PORT RAM
TX DATA BUFFER
POINTER TO I2C
POINTER TO I2C
RX RING
TX RING
2
C Buffer Descriptor Ring
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Figure 16-130. I
2
C controller is stored in buffers, which are referenced by
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FRAME STATUS
FRAME STATUS
DATA POINTER
DATA POINTER
DATA LENGTH
DATA LENGTH
RX BUFFER DESCRIPTOR RING
TX BUFFER DESCRIPTOR RING
2
C Memory Format
EXTERNAL MEMORY
RX DATA BUFFER
TX DATA BUFFER
MOTOROLA