HD6417618 RENESAS [Renesas Technology Corp], HD6417618 Datasheet - Page 342

• Manufacturer Part Number: HD6417618
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 12 Ethernet Controller Direct Memory Access Controller (E-DMAC)
Rev. 6.00 Jun. 12, 2007 Page 310 of 610
REJ09B0131-0600
Figure 12.12 Processing Transmission without Handling of the TC Interrupt
Notes: 1. The specified constant period is the timeout period mentioned in section 12.4.1, Usage Notes on SH-Ether EtherC/E-DMAC
1.
2.
3.
4.
5.
8.
2. Set n with reference to the maximum specified time values in table 12.2.
After setting the corresponding transmit
descriptor, set the TR bit in EDTRR to 1.
: Processing added as the countermeasure for the problem
Prepare multiple transmit descriptors.
After setting the transmit descriptor,
set the TR bit in EDTRR to 1.
Status Register(EESR).
Read the TACT bit of the
corresponding transmit descriptor.
Make initial settings for the timer.
Transmission task
Next transmission task
generated?
Transmission starts.
TACT = 0?
Yes
Yes
No
No
5.
6.
7.
8.
End
Read the TACT bit of
the corresponding
transmit descriptor.
Specified constant
period elapsed?
Start the timer.
Stop the timer.
TACT = 0?
i = 0;
Yes
Yes
*
1
9.
Initialize the transmit/receive
descriptors and transmit/receive
buffers.
No
No
Make initial settings of the
EtherC and E-DMAC modules.
Issue a software reset to
initialize the EtherC and
E-DMAC modules.
i >= n?
i++;
Yes
*
2
No