Section 21 Ethernet Controller Direct Memory Access Controller (E-DMAC)
Rev. 1.00 Mar. 12, 2008 Page 794 of 1178
REJ09B0403-0100
21.2.1
E-DMAC Mode Register (EDMR)
EDMR is a 32-bit readable/writable register that specifies the operating mode of the E-DMAC.
The settings in this register are normally made in the initialization process following a reset. If the
EtherC and E-DMAC are initialized by means of this register during data transmission, abnormal
data may be sent onto the line. Operating mode settings must not be changed while the transmit
and receive functions are enabled. To change the operating mode, the EtherC and E-DMAC
modules are got into at their initial state by means of the software reset bit (SWR) in this register,
then make new settings. It takes 64 states to initialize the EtherC and E-DMAC. Therefore,
registers of the EtherC and E-DMAC should be accessed after 64 states have elapsed.
Bit Bit
Name
Initial
value
R/W Description
31 to 7
All
0
R
Reserved
These bits are always read as 0. The initial value
should not be changed.
6
DE
0
R/W
E-DMAC Data Endian Convert
Selects whether or not the endian format is converted
on data transfer by the E-DMAC. However, the
endian format of the descriptors and E-DMAC register
values are not converted regardless of this bit setting.
0: Endian format not converted (big endian)
1: Endian format converted (little endian)
5
4
DL1
DL0
0
0
R/W
R/W
Transmit/Receive Descriptor Length
These bits specify the transmit/receive descriptor
length.
00: 16 bytes
01: 32 bytes
10: 64 bytes
11: Setting prohibited
3 to 1
All
0
R
Reserved
These bits are always read as 0. The initial value
should not be changed.
Содержание H8S Family
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Страница 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Страница 588: ...Section 15 Serial Communication Interface with FIFO SCIF Rev 1 00 Mar 12 2008 Page 540 of 1178 REJ09B0403 0100...
Страница 632: ...Section 17 Synchronous Serial Communication Unit SSU Rev 1 00 Mar 12 2008 Page 584 of 1178 REJ09B0403 0100...
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Страница 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Страница 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
Страница 964: ...Section 24 RAM Rev 1 00 Mar 12 2008 Page 916 of 1178 REJ09B0403 0100...
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