Rx_b buffer descriptor pointer offset register, Register bit assignment – Digi NS9750 User Manual
Page 416
E t h e r n e t C o n t r o l a n d S t a t u s r e g i s t e r s
3 9 2
N S 9 7 5 0 H a r d w a r e R e f e r e n c e
Register bit assignment
RX_B Buffer Descriptor Pointer Offset register
Address: A060 0A2C
Register bit assignment
Bits
Access
Mnemonic
Reset
Description
D31:11
N/A
Reserved
N/A
N/A
D10:00
R
RXAOFF
0x000
Contains an 11-bit byte offset from the start of the pool A
ring. The offset is updated at the end of the RX packet, and
will have the offset to the next buffer descriptor that will
be used. RXAOFF can be used to determine where the
RX_RD
logic will put the next packet.
Table 245: RX_A Buffer Descriptor Pointer Offset register
Bits
Access
Mnemonic
Reset
Description
D31:11
N/A
Reserved
N/A
N/A
D10:00
R
RXBOFF
0x000
Contains an 11-bit byte offset from the start of the pool B
ring. The offset is updated at the end of the RX packet, and
will have the offset to the next buffer descriptor that will
be used. RXBOFF can be used to determine where the
RX_RD
logic will put the next packet.
Table 246: RX_B Buffer Descriptor Pointer Offset register
Reserved
RXBOFF
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