Section 21 Ethernet Controller Direct Memory Access Controller (E-DMAC)
Rev. 1.00 Mar. 12, 2008 Page 825 of 1178
REJ09B0403-0100
(b) Receive Descriptor 1 (RD1)
RD1 specifies the receive buffer length (maximum 64 kbytes).
Bit Bit
Name
Initial
value
R/W Description
31 to 16
RBL
All 0
R/W
Receive Buffer Length
These bits specify the maximum reception byte length
in the corresponding receive buffer.
The transfer byte length must align with a 16-byte
boundary (bits 19 to 16 cleared to 0). The maximum
receive frame length with one frame per buffer is
1,514 bytes, excluding the CRC data. Therefore, for
the receive buffer length specification, a value of
1,520 bytes (H'05F0) that takes account of a 16-byte
boundary is set as the maximum receive frame
length.
15 to 0
RDL
All 0
R/W
Receive Data Length
These bits specify the data length of a receive frame
stored in the receive buffer.
The receive data transferred to the receive buffer
does not include the 4-byte CRC data at the end of
the frame. The receive frame length is reported as the
number of words (valid data bytes) not including this
CRC data.
(c)
Receive Descriptor 2 (RD2)
RD2 specifies the 32-bit receive buffer start address. The receive buffer start address must be on a
longword boundary.
Summary of Contents for H8S Family
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Page 70: ...Section 1 Overview Rev 1 00 Mar 12 2008 Page 22 of 1178 REJ09B0403 0100...
Page 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
Page 116: ...Section 3 MCU Operating Modes Rev 1 00 Mar 12 2008 Page 68 of 1178 REJ09B0403 0100...
Page 152: ...Section 5 Interrupt Controller Rev 1 00 Mar 12 2008 Page 104 of 1178 REJ09B0403 0100...
Page 206: ...Section 6 Bus Controller BSC Rev 1 00 Mar 12 2008 Page 158 of 1178 REJ09B0403 0100...
Page 420: ...Section 9 14 Bit PWM Timer PWMX Rev 1 00 Mar 12 2008 Page 372 of 1178 REJ09B0403 0100...
Page 476: ...Section 12 Watchdog Timer WDT Rev 1 00 Mar 12 2008 Page 428 of 1178 REJ09B0403 0100...
Page 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Page 712: ...Section 18 I2 C Bus Interface IIC Rev 1 00 Mar 12 2008 Page 664 of 1178 REJ09B0403 0100...
Page 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Page 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
Page 964: ...Section 24 RAM Rev 1 00 Mar 12 2008 Page 916 of 1178 REJ09B0403 0100...
Page 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Page 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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