s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 307

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

S3C4510B
BUFFER DESCRIPTOR
TRANSMIT BUFFER DESCRIPTOR
31
O
Reserved
30
29 28
[30:0] Buffer Data Pointer
[31] Ownership (O)
0 = CPU
Tx Control Bits
[0] Preamable (P)
0 = No preamble
[1] TxNoCRC Mode (N)
0 = CRC mode
[2] Little-Endian Mode (E)
0 = Big-endian
[3] Last (L)
0 = This is not the last buffer in the frame.
1 = This is the last buffer in the frame.
[4] Buffer Data Pointer Decrement (D)
0 = Increment
[6:5] Widget Aligment Control (WA)
00 = No invalid bytes
10 = 2 invalid bytes
[23:0] Buffer Length
Tx Status Bit
These bit may be regarded as valid when the L bit (in Tx control bit) is set.
[26] Transmission Completion (T)
0 = Normal
[31:0] Next Buffer Descriptor Pointer
The address of the next buffer descriptor
27
26
T
25 24
23
Figure 8-10. Transmit Buffer Descriptor
22
21 20
Reserved
Next Buffer Descriptor Pointer
1 = DMA
1 = Preamble
1 = No CRC mode
1 = Little-endian
1 = Decrement
01 = 1 invalid bytes
11 = 3 invalid bytes
1 = One frame completed
19
18 17
Buffer Data Pointer
16
15
Buffer Length
14
13
12
11
10
9
8
7
6
WA D L E N P
5
4
HDLC CONTROLLERS
3
2
1
0
8-21