MCF5272VF66 Freescale, MCF5272VF66 Datasheet - Page 251

• Manufacturer Part Number: MCF5272VF66
• Manufacturer: Freescale

Specifications of MCF5272VF66

• Family Name: MCF5xxx
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 66MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 3.3V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 196
• Package Type: MA-BGA
• Lead Free Status / RoHS Status: Not Compliant

11.5.22 Initialization Sequence
This section describes which registers and RAM locations are reset due to hardware reset, which are reset
due to the FEC reset, and what locations the user must initialize before enabling the FEC.
As soon as the FEC is initialized and enabled, it operates autonomously. Typically, the driver writes only
to RDAR, TDAR, and EIR during operation.
11.5.22.1 Hardware Initialization
In the FEC, hardware resets only those registers that generate interrupts to the MCF5272 processor or
cause conflict on bidirectional buses. The registers are reset due to a hardware reset.
Other registers reset whenever the ETHER_EN bit is cleared. Clearing ETHER_EN immediately stops all
DMA and transmit activity after a bad CRC is sent, as shown in
11.5.23 User Initialization (Prior to Asserting ETHER_EN)
The user must initialize portions the FEC prior to setting the ETHER_EN bit. The exact values depend on
the particular application. The sequence is similar to the procedure defined in
Freescale Semiconductor
System/User
User/System
Step
System
User
MCF5272 ColdFire
1
2
3
4
5
6
System
User
Table 11-32. User Initialization Process (before ETHER_EN)
Table 11-30. Hardware Initialization
Register/Machine
®
MII State Machine
XMIT block
DMA block
Table 11-31. ETHER_EN = 0
Location
Integrated Microprocessor User’s Manual, Rev. 3
RDAR
TDAR
MSCR
EIMR
ECR
EIR
Set IVSR (define ILEVEL)
Set MAUR and MALR
Set FRSR (optional)
Set TFSR (optional)
Description
Set EIMR
Clear EIR
All DMA activity is terminated
Transmission is Aborted
Prevent conflict on MMFR
Table 11-31
Reset Value
Cleared
Cleared
Effect
Cleared
Cleared
Cleared
Cleared
Table
11-32.
Ethernet Module
11-33