SH7615 Datasheet, PDF (489/925 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH
RISC engine Family/SH7600 Series

Bits 29 and 28—Transmit Frame Position 1, 0 (TFP1, TFP0): These two bits specify the
relationship between the transmit buffer and transmit frame.
Bit 29: Bit 28:
TFP1 TFP0 Description
0
0
Frame transmission for transmit buffer indicated by this descriptor continues
(frame is not concluded)
1
Transmit buffer indicated by this descriptor contains end of frame (frame is
concluded)
1
0
Transmit buffer indicated by this descriptor is start of frame (frame is not
concluded)
1
Contents of transmit buffer indicated by this descriptor are equivalent to one
frame (one frame/one buffer)
Note: In the preceding and following descriptors, a logically positive relationship must be
maintained between the settings of this bit and the TDLE bit.
Bit 27—Transmit Frame Error (TFE): Indicates that one or other bit of the transmit frame status
indicated by bits 26 to 0 is set.
Bit 27: TFE
0
1
Description
No error during transmission
An error of some kind occurred during transmission (see bits 26 to 0)
Bits 26 to 0—Transmit Frame Status 26 to 0 (TFS26 to TFS0): These bits indicate the error status
during frame transmission.
• TFS26 to TFS9—Reserved
• TFS8—Transmit Abort Error Detect
Note: This bit is set to 1 when any of transmit frame status bits 4 to 0 (TFS4 to TFS0) is set.
When this bit is set, the transmit frame error bit (bit 27: TFE) is set to 1.
• TFS7 to TFS5—Reserved
• TFS4—Illegal Transmit Frame (corresponds to ITF bit in EESR)
• TFS3—Carrier Not Detect (corresponds to CND bit in EESR)
• TFS2—Detect Loss of Carrier (corresponds to DLC bit in EESR)
• TFS1—Delayed Collision Detect in Transmission (corresponds to CD bit in EESR)
• TFS0—Transmit Retry Over (corresponds to TRO bit in EESR)
Rev. 2.00, 03/05, page 451 of 884