SH7672 datasheet(487/1292 Pages) RENESAS

487 / 1292 page

Section 13 Ethernet Controller Direct Memory Access Controller (E-DMAC)

Rev. 1.00 Nov. 14, 2007 Page 461 of 1262

REJ09B0437-0100

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:

Initial Value:

R/W:

Bit:

Initial Value:

R/W:

0000000000000000

RDFA[31:16]

RRRRRRRRRRRRRRRR

RDFA[15:0]

Bit

Bit Name

Initial value R/W

Description

31 to 0 RDFA[31:0] All 0

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:

Initial Value:

R/W:

Bit:

Initial Value:

R/W:

0000000000000000

TBRA[31:16]

RRRRRRRRRRRRRRRR

TBRA[15:0]

Bit

Bit Name

Initial value R/W

Description

31 to 0 TBRA[31:0] All 0

Transmission-Buffer Read Address

These bits can only be read. Writing is prohibited.

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