mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 771

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

Figure 16-106 illustrates the basic components and pins required to make the Ethernet
connection between the MPC823 and EEST.
The following pins function differently when a serial communication controller is in Ethernet
mode than when it is in other protocols:
• Transmit Enable (TENA)—The RTSx pin changes to TENA when a serial
• Receive Enable (RENA)—The CDx pin changes to RENA when a serial communication
• Collision (CLSN)—The CTSx pin changes to CLSN when a serial communication
communication controller is in Ethernet mode. The polarity of TENA is active high,
whereas the polarity of RTSx is active low.
controller is in Ethernet mode. The polarity of RENA is active high, whereas the polarity
of CDx is active low.
controller is in Ethernet mode. The polarity of CLSN is active high, whereas the polarity
of CTSx is active low.
PREAMBLE
7 BYTES
Note: The carrier sense signal is referenced in Ethernet descriptions because it
Figure 16-105. Connecting the MPC823 to Ethernet
DELIMITER
MPC823
1 BYTE
START
FRAME
indicates when the LAN is being used. Carrier sense is defined as RENA OR’ed
with CLSN.
PARALLEL I/O
MPC823
TENA (RTSx)
SCCx TXDx
RCLK (CLKx)
CLSN (CTSx)
TCLK (CLKx)
Freescale Semiconductor, Inc.
RENA (CDx)
NOTE: The MPC82x automatically pads the short transmit frames.
For More Information On This Product,
RXDx
6 BYTES
ADDR
DEST
MPC823 REFERENCE MANUAL
STORED IN TRANSMIT BUFFER
STORED IN RECEIVE BUFFER
Go to: www.freescale.com
6 BYTES
SOURCE
ADDR
LENGTH
2 BYTES
TYPE/
TX
TENA
TCLK
RX
RENA
RCLK
CLSN
LOOP
MC68160
EEST
46–1500 BYTES
Communication Processor Module
DATA
RJ-45
D-15
TWISTED PAIR
AUI
SEQUENCE
FRAME
CHECK
4 BYTES
16-319