W90N740CD WINBOND [Winbond], W90N740CD Datasheet - Page 101

• Manufacturer Part Number: W90N740CD
• Description: 32-Bit ARM7TDMI-Based Micro-Controller
• Manufacturer: WINBOND [Winbond]

RXFS [15:0]: DMA receive frame length
Default value: 0000h
When an early notification interrupt occurs, the frame length/type field contains the size of the frame
that is currently being received, and stores in RXFS.
To save space in the frame memory buffer, users can determine the current frame length by :
Note: all the DMARFS bits are cleared by write ones; writing zeros has no effect.
Current Transmit Descriptor Start Address Register (CTXDSA_0, CTXDSA_1)
CTXDSA [31:0]: Current Transmit Descriptor Start Address
Default value: 0000h
This register reports the start address of the current transmit descriptor used by EMC.
CTXDSA_0
CTXDSA_1
REGISTER
1. Enable the early notification interrupt (set EnDEN bit in MIEN)
2. Read the RXFS field when the interrupt occurs
31
23
15
7
0xFFF0.30CC
0xFFF0.38CC
ADDRESS
30
22
14
6
29
21
13
5
R/W
R
R
Current Transmit Descriptor Start Address
Register
Current Transmit Descriptor Start Address
Register
28
20
12
4
CTXDSA
CTXDSA
CTXDSA
CTXDSA
- 98 -
W90N740CD/W90N740CDG
DESCRIPTION
27
19
11
3
26
18
10
2
25
17
9
1
RESET VALUE
0x0000.0000
0x0000.0000
24
16
8
0