SH7764 Datasheet, PDF (834/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 20 Ethernet Controller Direct Memory Access Controller (E-DMAC)
20.2.16 Receive Descriptor Fetch Address Register (RDFAR)
RDFAR stores the descriptor start address that is required when the E-DMAC fetches descriptor
information from the receive descriptor. Which receive 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.
Bit: 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
RDFA[31:16]
Initial value: 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R R R R R R R R R R R R R R R R
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
RDFA[15:0]
Initial value: 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R R R R R R R R R R R R R R R R
Bit
31 to 0
Bit Name
RDFA[31:0]
Initial
Value R/W Description
All 0 R
Receive Descriptor Fetch Address
Writing to these bits during the reception is prohibited.
Rev. 1.00 Nov. 22, 2007 Page 778 of 1692
REJ09B0360-0100