s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 308

• Manufacturer Part Number: s3c4510b
• Description: 16/32-bit Risc Microcontroller
• Manufacturer: Samsung Semiconductor, Inc.

HDLC CONTROLLERS
RECEIVE BUFFER DESCRIPTOR
8-22
31
O
Reserved
30
29 28
[30:0] Buffer Data Pointer
[31] Ownership (O)
0 = CPU
[15:0] Buffer Length
Received buffer lengths are wrote to this buffer descriptor
Rx Status Bits
This 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 reveived.
[19] Over-run (OV)
0 = Normal
1 = The reveived 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 first to the frame.
[24] Frame Length Violation (FLV)
0 = Normal
1 = This received frame length exceeds the value of the maximum frame length register.
[31:0] Next Buffer Descriptor Pointer
The address of the next buffer descriptor
27
26
25 24
V
F
L
23
L F
22
Figure 8-11. Receive Buffer Descriptor
21 20
A
B
T
M
Next Buffer Descriptor Pointer
D
T
1 = DMA
1 = CD lost occurs
1 = DPLL two miss clock occurs.
19
O
V
18 17
O
N
Buffer Data Pointer
C
D
Reserved
16
15
14
13
12
11
10
Buffer Length
9
8
7
6
5
4
3
2
1
0
S3C4510B