Section 10 Ethernet Controller Direct Memory Access Controller (E-DMAC)
Rev. 2.00 Mar 09, 2006 page 449 of 906
REJ09B0292-0200
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
Description
0
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)
1
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
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
Description
0
This is not the last transmit descriptor list
1
This is the last transmit descriptor list
Bits 29 and 28—Transmit Frame Position 1, 0 (TFP1, TFP0): These two bits specify the
relationship between the transmit buffer and transmit frame.
Summary of Contents for SH7616
Page 10: ...Rev 2 00 Mar 09 2006 page x of xxvi ...
Page 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Page 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Page 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Page 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Page 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Page 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Page 935: ...SH7616 Hardware Manual ...