HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 464
HD6417615
Manufacturer Part Number
HD6417615
Description
Hardware Manual
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6417615.pdf
(873 pages)
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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.
449
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