MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
14-16
Freescale Semiconductor
14.3.4.2.5
Ethernet Control Register (ECR)
ECR is a read/write user register, though both fields in this register may be altered by hardware as well.
The ECR is used to enable/disable the FEC.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0 0
0
0
0
0
0
X_DES_ACTIVE
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Address
Base + 0x0014
16 17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Address
Base + 0x0014
Figure 14-6. Transmit Descriptor Active
Register (TDAR)
Table 14-8. TDAR Field Descriptions
Bits
Name
Description
0–6
—
Reserved, should be cleared.
7
X_DES_ACTIVE
Set to one when this register is written, regardless of the value written. Cleared by
the FEC device whenever no additional “ready” descriptors remain in the transmit
ring. Also cleared when ECR[ETHER_EN] is cleared.
8–31
—
Reserved, should be cleared.
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
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
Address
Base + 0x0024
16 17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0 0
0
0
0
0
0
0
0
0
0
0
0
0
ETHER_EN
RESET
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Address
Base + 0x0024
Figure 14-7. Ethernet Control Register (ECR)
Summary of Contents for MPC5553
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