r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 996

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

Section 23 Gigabit Ethernet Controller (GETHER)
23.3.84 Transmit Descriptor Fetch Address Register (TDFAR)
TDFAR stores the descriptor start address that is required when the E-DMAC fetches descriptor
information from the transmit descriptor. Which transmit descriptor information is used for
processing by the E-DMAC can be recognized by monitoring addresses displayed in this register.
The address from which the E-DMAC is actually fetching a descriptor may be different from the
value read from this register. In the initial setting, set the address of the transmit descriptor at
which transmit processing is to be started.
Rev. 1.00 Oct. 01, 2007 Page 930 of 1956
REJ09B0256-0100
Bit
31 to 0
Initial value:
Initial value:
R/W:
R/W:
Bit:
Bit:
Bit Name
TDFA[31:0]
R/W
R/W
31
15
0
0
R/W
R/W
30
14
0
0
R/W
R/W
29
13
0
0
Initial
Value
All 0
R/W
R/W
28
12
0
0
R/W
R/W
27
11
0
0
R/W
R/W
R/W
R/W
26
10
0
0
Description
Transmit Descriptor Fetch Address
Writing to these bits during transmission is prohibited.
R/W
R/W
25
0
9
0
TDFA[31:16]
R/W
R/W
TDFA[15:0]
24
0
8
0
R/W
R/W
23
0
7
0
R/W
R/W
22
0
6
0
R/W
R/W
21
0
5
0
R/W
R/W
20
0
4
0
R/W
R/W
19
0
3
0
R/W
R/W
18
0
2
0
R/W
17
0
1
0
R/W
R/W
16
0
0
0