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HD6417618 датащи(PDF) 342 Page - Renesas Technology Corp

номер детали HD6417618
подробное описание детали  32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
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HD6417618 датащи(HTML) 342 Page - Renesas Technology Corp

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



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