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16.9.22.3 UNDERSTANDING ETHERNET ON THE MPC823e. You are encouraged to
learn about the basic functionality of the serial communication controllers and the overall
architecture of the communication processor module before delving into the functionality of
the SCCs in Ethernet mode. It is important that first-time users of the MPC823e who plan to
use Ethernet read the following sections of this manual first.
• Section 12.3 Interrupt Configuration contains an overview of the MPC823e interrupt
structure and explains how to set up interrupt control.
• Section 16.2 The RISC Microcontroller , Section 16.2 The RISC Microcontroller ,
and Section 16.2.6.3 Dual-Port RAM explain how the RISC microcontroller issues
special commands to the Ethernet channel. The dual-port RAM loads Ethernet
parameters and initializes buffer descriptors for the Ethernet channel to use.
• Section 16.5 The SDMA Channels explains how SDMA channels are used to transfer
data to or from the Ethernet channel and system memory.
• Section 16.7.8 Nonmultiplexed Serial Interface Configuration explains how clocks
are routed to an SCCx through the bank of clocks.
• Section 16.9.22 The SCCx in Ethernet Mode explains how to program an SCCx in
Ethernet mode.
• Section 16.14 The Parallel I/O Ports explains how to configure the preferred Ethernet
pin functions to be active.
• Section 16.15 The CPM Interrupt Controller defines the interrupt priority of a serial
communication controller and how interrupts are generated to the core.
16.9.22.4 CONNECTING THE MPC823e TO THE EEST. The interface to the external
EEST chip consists of the following Ethernet pins:
• Receive clock (RCLK)—The CLK1, CLK2, CLK3, or CLK4 pin that is routed through the
bank of clocks on the MPC823e.
• Transmit clock (TCLK)—The CLK1, CLK2, CLK3, or CLK4 pin that is routed through the
bank of clocks on the MPC823e. RCLK and TCLK must not be connected to the same
CLKx pin since the EEST provides a separate receive and transmit clock signal.
• Transmit data (TXDx)—The MPC823e TXD2 or TXD3 pin.
• Receive data (RXDx)—The MPC823e RXD2 or RXD3 pin.
MOTOROLA
MPC823e REFERENCE MANUAL
Communication Processor Module
16-321
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