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 9101112131415
R 0 0 0 0 0 0 0 X_DES_ACTIVE 0 0 0 0 0 0 0 0
W
Reset0 0 0 0000 0 0 000 00 0 0
Address Base + 0x0014
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R0 0 0 0000 0 0 000 00 0 0
W
Reset0 0 0 0000 0 0 000 00 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
R0 0 0 00000 0 000 00 0 0
W
Reset1 1 1 10000 0 000 00 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
Reset0 0 0 00000 0 000 00 0 0
Address Base + 0x0024
Figure 14-7. Ethernet Control Register (ECR)
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