mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 226

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Module Operation
11.2 Module Operation
The FEC is implemented using a combination of hardware and microcode. Figure 11-1
shows a functional block diagram of this module.
Figure 11-2 shows a fast Ethernet module.
11-2
CTS = CLSN
CD = RENA
REJECT
Rstrt
Internal Bus Interface
Controller
Descriptor
Controller
Bus
Peripheral Bus
Figure 11-2. Fast Ethernet Module Block Diagram
RXD
Receiver
Control
CSRs
Unit
Figure 11-1. Ethernet Block Diagram
MCF5272 User’s Manual
Shifter
FIFO
Data
Rx
Registers
Control
E_MDC
E_MDIO
MII
RAM I/F
RAM
Shifter
FIFO
Data
Tx
Receive
Controller
Random No.
FIFO
E_RxCLK
E_RxDV
E_RxD[3:0]
E_RxER
Transmitter
Control
Unit
Descriptor Access
TXD
Internal Clocks
Dedicated DMA/
Transmit
Generator
and Defer
Slot Time
Counter
Clock
E_TxCLK
E_TxEN
E_TxD[3:0]
E_TxER
E_CRS,E_COL
RTS = TENA
CD = RENA
CTS = CLSN
MOTOROLA
RCLK
TCLK