Section 10 Ethernet Controller Direct Memory Access Controller (E-DMAC)
Rev. 2.00 Mar 09, 2006 page 457 of 906
REJ09B0292-0200
10.3.3
Reception
When the receiver is enabled and the CPU sets the receive request bit (RR) in the E-DMAC
receive request register (EDRRR), the E-DMAC reads the descriptor following the previously
used one from the receive descriptor list (in the initial state, the descriptor indicated by the
transmission descriptor start address register (TDLAR)), and then enters the receive-standby state.
If the setting of the RACT bit is “active” and an own-address frame is received, the E-DMAC
transfers the frame to the receive buffer specified by RD2. If the data length of the received frame
is greater than the buffer length given by RD1, the E-DMAC performs write-back to the descriptor
when the buffer is full (RFP = 10 or 00), then reads the next descriptor. The E-DMAC then
continues to transfer data to the receive buffer specified by the new RD2. When frame reception is
completed, or if frame reception is suspended because of an error of some kind, the E-DMAC
performs write-back to the relevant descriptor (RFP = 11 or 01), and then ends the receive
processing. The E-DMAC then reads the next descriptor and enters the receive-standby state
again.
Note: To receive frames continuously, the receive enable control bit (RNC) must be set to 1 in
the receive control register (RCR). After initialization, this bit is cleared to 0.
Содержание SH7616
Страница 10: ...Rev 2 00 Mar 09 2006 page x of xxvi ...
Страница 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Страница 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Страница 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Страница 662: ...Section 14 Serial Communication Interface with FIFO SCIF Rev 2 00 Mar 09 2006 page 636 of 906 REJ09B0292 0200 ...
Страница 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Страница 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...