SH7764 Datasheet, PDF (827/1752 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)
Initial
Bit
Bit Name Value R/W Description
10 to 0 TFT[10:0] All 0 R/W Transmit FIFO Threshold
A value and smaller than the FIFO size specified by FDR
must be set as the transmit FIFO threshold.
H'000: Store and forward modes
H'001 to H'00C: Setting prohibited
H'00D: 52 bytes
H'00E: 56 bytes
:
:
H'01F: 124 bytes
H'020: 128 bytes
:
:
H'03F: 252 bytes
H'040: 256 bytes
:
:
H'07F: 508 bytes
H'080: 512 bytes
:
:
H'0FF: 1,020 bytes
H'100: 1,024 bytes
:
:
H'1FF: 2,044 bytes
H'200: 2,048 bytes
H'201 to H'7FF: Setting prohibited
Notes: 1. When starting transmission before one frame of data write has completed, take care no
underflow occurs.
2. Operation cannot be guaranteed when the value set in this register is greater than the
transmit FIFO size.
3. To prevent a transmit underflow, setting the initial value (store and forward modes) is
recommended.
Rev. 1.00 Nov. 22, 2007 Page 771 of 1692
REJ09B0360-0100