SH7670 Datasheet, PDF (487/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 13 Ethernet Controller Direct Memory Access Controller (E-DMAC)
13.2.15 Receiving-Descriptor Fetch Address Register (RDFAR)
RDFAR stores the descriptor start address that is required when the E-DMAC fetches descriptor
information from the receiving descriptor. Which receiving 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 Bit Name Initial value R/W
31 to 0 RDFA[31:0] All 0
R
Description
Receiving-Descriptor Fetch Address
These bits can only be read. Writing is prohibited.
13.2.16 Transmission-Buffer Read Address Register (TBRAR)
TBRAR stores the address of the transmission buffer when the E-DMAC reads data from the
transmission buffer. Which addresses in the transmission buffer are processed by the E-DMAC
can be recognized by monitoring addresses displayed in this register. The address from which the
E-DMAC is actually reading in the buffer 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
TBRA[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
TBRA[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 Bit Name Initial value R/W
31 to 0 TBRA[31:0] All 0
R
Description
Transmission-Buffer Read Address
These bits can only be read. Writing is prohibited.
Rev. 1.00 Nov. 14, 2007 Page 461 of 1262
REJ09B0437-0100