HD6417616 RENESAS [Renesas Technology Corp], HD6417616 Datasheet - Page 449
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HD6417616
Manufacturer Part Number
HD6417616
Description
32-Bit RISC Microcomputer SuperH™ RISC engine Family/SH7600 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417616.pdf
(935 pages)
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10.2.3
The E-DMAC receive request register issues receive directives to the E-DMAC.
Bits 31 to 1—Reserved: These bits are always read as 0. The write value should always be 0.
Bit 0—Receive Request (RR): When 1 is written to this bit, the E-DMAC reads a descriptor, and
then transfers receive data to the buffer in response to receive requests from the EtherC.
Bit 0: RR
0
1
Notes: In order to receive a frame in response to a receive request, the receive descriptor active
Initial value:
Initial value:
bit in the receive descriptor must be set to “active” beforehand.
1. When the receive request bit is set, the E-DMAC reads the relevant receive descriptor.
2. If the receive descriptor active bit in the descriptor has the “active” setting, the E-DMAC
3. When one receive buffer of data has been received, the E-DMAC reads the next
E-DMAC Receive Request Register (EDRRR)
prepares for a receive request from the EtherC.
descriptor and prepares to receive the next frame. If the receive descriptor active bit in
the descriptor has the “inactive” setting, the RR bit is cleared and operation of the
receive DMAC is halted.
R/W:
R/W:
Bit:
Bit:
Description
After frame reception is completed, the receiver is disabled
A receive descriptor is read, and transfer is enabled
31
—
—
R
R
0
7
0
Section 10 Ethernet Controller Direct Memory Access Controller (E-DMAC)
30
—
—
R
R
0
6
0
29
—
—
R
R
0
5
0
. . .
. . .
. . .
. . .
—
R
4
0
Rev. 2.00 Mar 09, 2006 page 423 of 906
11
—
—
R
R
0
3
0
10
—
—
R
R
0
2
0
REJ09B0292-0200
—
—
R
R
9
0
1
0
R/W
RR
—
R
8
0
0
0
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