Tx buffer descriptor pointer register, Register bit assignment, Table 242: tx buffer descriptor pointer register – Digi NS9750 User Manual
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E t h e r n e t C o m m u n i c a t i o n M o d u l e
TX Buffer Descriptor Pointer register
Address: A060 0A18
Register bit assignment
Transmit Recover Buffer Descriptor Pointer register
Address: A060 0A1C
Bits
Access
Mnemonic
Reset
Description
D31:08
N/A
Reserved
N/A
N/A
D07:00
R/W
TXPTR
0x00
Contains a pointer to the initial transmit buffer descriptor
in the TX buffer descriptor RAM.
Note:
This pointer is the 8-bit physical address of the
TX buffer descriptor RAM, and points to the
first location of the four-location buffer
descriptor. The byte offset of this buffer
descriptor can be calculated by multiplying this
value by 4.
Table 242: TX Buffer Descriptor Pointer register
Reserved
TXPTR
13
12
11
10
9
8
7
6
5
4
3
2
1
0
15
14
31
29
28
27
26
25
24
23
22
21
20
19
18
17
16
30
Reserved
Reserved
TXRPTR
13
12
11
10
9
8
7
6
5
4
3
2
1
0
15
14
31
29
28
27
26
25
24
23
22
21
20
19
18
17
16
30
Reserved