HD6417618 datasheet(342/646 Pages) RENESAS

342 / 646 page

Section 12 Ethernet Controller Direct Memory Access Controller (E-DMAC)

Rev. 6.00 Jun. 12, 2007 Page 310 of 610

REJ09B0131-0600

Yes

Next transmission task

generated?

TACT = 0?

Yes

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.

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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