MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
14-34
Freescale Semiconductor
14.4
Functional Description
This section describes the operation of the FEC, beginning with the hardware and software initialization
sequence, then the software (Ethernet driver) interface for transmitting and receiving frames.
Following the software initialization and operation sections are sections providing a detailed description
of the functions of the FEC.
14.4.1
Initialization Sequence
This section describes which registers are reset due to hardware reset, which are reset by the FEC RISC,
and what locations the user must initialize prior to enabling the FEC.
14.4.1.1
Hardware Controlled Initialization
In the FEC, registers and control logic that generate interrupts are reset by hardware. A hardware reset
deasserts output signals and resets general configuration bits.
Other registers reset when the ECR[ETHER_EN] bit is cleared. ECR[ETHER_EN] is deasserted by a hard
reset or may be deasserted by software to halt operation. By deasserting ECR[ETHER_EN], the
configuration control registers such as the TCR and RCR will not be reset, but the entire data path will be
reset.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
Address
Base + 0x0188
16 17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
0
0
0
0
R_BUF_SIZE
0
0
0
0
W
Reset
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
Address
Base + 0x0188
1
“U” signifies a bit that is uninitialized.
Figure 14-25. Receive Buffer Size Register (EMRBR)
Table 14-28. EMRBR Field Descriptions
Bits
Name
Descriptions
0–20
—
Reserved, should be written to 0 by the host processor.
21–27
R_BUF_SIZE
Receive buffer size.
28–31
—
Reserved, should be written to 0 by the host processor.
Summary of Contents for MPC5553
Page 5: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 2 Freescale Semiconductor...
Page 21: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 xvi Freescale Semiconductor...
Page 47: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 1 26 Freescale Semiconductor...
Page 163: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 4 20 Freescale Semiconductor...
Page 179: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 5 16 Freescale Semiconductor...
Page 561: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 13 38 Freescale Semiconductor...
Page 615: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 14 54 Freescale Semiconductor...
Page 707: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 17 68 Freescale Semiconductor...
Page 755: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 18 48 Freescale Semiconductor...
Page 873: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 19 118 Freescale Semiconductor...
Page 984: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 Freescale Semiconductor 21 41...
Page 985: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 21 42 Freescale Semiconductor...
Page 1019: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 22 34 Freescale Semiconductor...
Page 1129: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 25 90 Freescale Semiconductor...
