NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 591 -
Revision V1.30
NUC97
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CHNIC
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RXDES 3: RXDMA Descriptor Word 3
The RXDMA descriptor word 3 contains the next RXDMA descriptor starting address or time
stamp most significant 32-bit value. The detail description of RXDES 3 is shown below.
31
30
29
28
27
26
25
24
NRXDSA/TSMSB
23
22
21
20
19
18
17
16
NRXDSA/TSMSB
15
14
13
12
11
10
9
8
NRXDSA/TSMSB
7
6
5
4
3
2
1
0
NRXDSA/TSMSB
Bits
Description
[31:0]
NRXDSA
Next RX Descriptor Starting Address
NRXDSA is the starting address of the next RX descriptor. When Ethernet MAC
controller fetches the next RX descriptor, it ignored the bits [1:0] of NRXDSA.
Bits
Description
[31:0]
TSMSB
Time Stamp Most Significant 32-bit
If TSEN (EMACn_TSCR[0]) enabled, Ethernet MAC controller would store time stamp
most signification 32-bit value, register EMACn_TSMSR, into this field when it writes
back RX Descriptor to system memory.