Transmit Descriptor Active Register (Tdar); Ethernet Control Register (Ecr); Tdar Field Descriptions - Motorola ColdFire MCF5281 User Manual

Programming Model
31
Field
Reset
R/W
15
Field
Reset
R/W
Address
Figure 17-7. Transmit Descriptor Active Register (TDAR)
Bits
31–25
24 X_DES_ACTIVE Set to one when this register is written, regardless of the value written.
23–0

17.5.4.5 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.
31
Field
Reset
R/W
15
Field
Reset
R/W
Address
17-28
—
0000_0000_0000_0000
0000_0000_0000_0000
Table 17-15. TDAR Field Descriptions
Name
— Reserved, should be cleared.
Cleared by the FEC device whenever no additional "ready" descriptors
remain in the transmit ring. Also cleared when ECR[ETHER_EN] is
cleared.
— Reserved, should be cleared.
1111_0000_0000_0000
—
0000_0000_0000_0000
Figure 17-8. Ethernet Control Register (ECR)
MCF5282 User's Manual
25 24 23
X_DES_ACTIVE
R/W
—
R/W
IPSBAR + 0x1014
Description
—
R/W
R/W
IPSBAR + 0x1024
16
—
0
16
1 0
ETHER_EN RESET
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