SH7713 Datasheet, PDF (731/904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 19 Ethernet Controller Direct Memory Access Controller (E-DMAC)
19.2.14 Receive Buffer Write Address Register (RBWAR)
RBWAR stores the address of data to be written in the receiving buffer when the E-DMAC writes
data to the receiving buffer. Which addresses in the receiving buffer are processed by the E-
DMAC can be recognized by monitoring addresses displayed in this register. The address that the
E-DMAC is actually processing may be different from the value read from this register.
Initial
Bit
Bit Name Value R/W Description
31 to 0 RBWA31 to All 0
R
RBWA0
Receiving-Buffer Write Address
These bits can only be read. Writing is prohibited.
19.2.15 Receive 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.
Initial
Bit
Bit Name Value R/W Description
31 to 0 RDFA31 to All 0
R
RDFA0
Receiving-Descriptor Fetch Address
These bits can only be read. Writing is prohibited.
19.2.16 Transmit 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.
Initial
Bit
Bit Name Value R/W Description
31 to 0 TBRA31 to All 0
R
TBRA0
Transmission-Buffer Read Address
These bits can only be read. Writing is prohibited.
Rev.1.50 Aug. 30, 2006 Page 691 of 860
REJ09B0288-0150