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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
14-32
Freescale Semiconductor
This register is not reset and must be initialized by the user prior to operation.
14.3.4.3.3
Transmit Buffer Descriptor Ring Start (ETDSR)
The ETDSR is written by the user. It provides a pointer to the start of the circular transmit buffer descriptor
queue in external memory. This pointer must be 32-bit aligned; however, it is recommended it be made
128-bit aligned (evenly divisible by 16). Bits 30 and 31 should be written to 0 by the user. Non-zero values
in these two bit positions are ignored by the hardware.
This register is not reset and must be initialized by the user prior to operation.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
R_DES_START
W
Reset
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
Address
Base + 0x0180
16 17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
R_DES_START
0
0
W
Reset
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
Address
Base + 0x0180
1
“U” signifies a bit that is uninitialized.
Figure 14-23. Receive Descriptor Ring Start Register (ERDSR)
Table 14-26. ERDSR Field Descriptions
Bits
Name
Descriptions
0–29
R_DES_START
Pointer to start of receive buffer descriptor queue.
30–31
—
Reserved, should be cleared.
Содержание MPC5553
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