Receive Buffer Descriptor - Samsung S3C2500B User Manual

HDLC CONTROLLER

8.6.2 RECEIVE BUFFER DESCRIPTOR

31
O
[31:0] Buffer Data Pointer
[15:0] Buffer Length
Rx Status Bits
These bits may be regarded as valid when L bit(in Rx status bit) is set
[16] CD Lost (CD)
0 = Normal
[17] CRC Error (CE)
0 = Normal
1 = CRC error occurs to the frame received
[18] Non-octet Aligned Frame (NO)
0 = Normal
1 = Non-octet aligned frame is received
[19] Overrun (OV)
0 = Normal
1 = The received frame overruns
[20] DPLL Two Miss (DTM)
0 = Normal
[21] Rx Abort (ABT)
0 = Normal
1 = The received frame aborted
[22] First In Frame (F)
0 = This buffer descriptor status is not the first to the frame
1 = This buffer descriptor status is the first to the frame
[23] Last In Frame (L)
0 = This buffer descriptor status is not the last to the frame
1 = This buffer descriptor status is the last to the frame
[24] Frame Length Violation (FLV)
0 = Normal
1 = This received frame length exceeds the value of the maximum frame length register
[31] Ownership (O)
0 = CPU
8-22
24 23
Buffer Pointer
Rx Control Bits
1 = CD lost occurs
1 = DPLL two miss clock occurs
1 = DMA
Figure 8-11. Receive Buffer Descriptor
16 15
Buffer Length
S3C2500B
0