HD6417616 RENESAS [Renesas Technology Corp], HD6417616 Datasheet - Page 475
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HD6417616
Manufacturer Part Number
HD6417616
Description
32-Bit RISC Microcomputer SuperH™ RISC engine Family/SH7600 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417616.pdf
(935 pages)
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Transmit Descriptor 0 (TD0): TD0 indicates the transmit frame status. The CPU and E-DMAC
use TD0 to report the frame transmission status.
Bit 31—Transmit Descriptor Active (TACT): Indicates that this descriptor is active. The CPU sets
this bit after transmit data has been transferred to the transmit buffer. The E-DMAC resets this bit
on completion of a frame transfer or when transmission is suspended.
Bit 31: TACT
0
1
Bit 30—Transmit Descriptor List Last (TDLE): Indicates that this descriptor is the last in the
transmit descriptor list. After completion of the corresponding buffer transfer, the E-DMAC
references the first descriptor. This specification is used to set a ring configuration for the transmit
descriptors.
Bit 30: TDLE
0
1
Bits 29 and 28—Transmit Frame Position 1, 0 (TFP1, TFP0): These two bits specify the
relationship between the transmit buffer and transmit frame.
Description
The transmit descriptor is invalid
Indicates that valid data has not been written to the transmit buffer by the CPU,
or this bit has been reset by a write-back operation on termination of E-DMAC
frame transfer processing (completion or suspension of transmission)
If this state is recognized in an E-DMAC descriptor read, the E-DMAC
terminates transmit processing and transmit operations cannot be continued (a
restart is necessary)
The transmit descriptor is valid
Indicates that valid data has been written to the transmit buffer by the CPU and
frame transfer processing has not yet been executed, or that frame transfer is
in progress
When this state is recognized in an E-DMAC descriptor read, the E-DMAC
continues with the transmit operation
Description
This is not the last transmit descriptor list
This is the last transmit descriptor list
Section 10 Ethernet Controller Direct Memory Access Controller (E-DMAC)
Rev. 2.00 Mar 09, 2006 page 449 of 906
REJ09B0292-0200
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