s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 335

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

S3C4510B
DMA RX BUFFER DESCRIPTOR POINTER REGISTER
The DMA receive buffer descriptor pointer register contains the address of the Rx buffer data pointer on the data
to be received. During a DMA operation, the buffer descriptor pointer is updated by the next buffer data pointer.
MAXIMUM FRAME LENGTH REGISTER
The HDLC controller checks the length of an incoming frame against the user-defined value in DMA mode. If the
frame received exceeds this register value, the frame is discarded, and FLV(Frame Length Violated) bit is set in
the buffer descriptor belonging to that frame.
HDMARXPTRA
HDMARXPTRB
Registers
Registers
HMFLRA
HMFLRB
31
31
30
30
29
29
28
28
27
27
26
26
0x703c
0x803c
25
25
Table 8-19. DMA Rx Buffer Descriptor Pointer Registers
Offset
0x7040
0x8040
Offset
Table 8-20. HDMATXCNT and HDMARXCNT Registers
24
24
Figure 8-26. DMA Rx Buffer Descriptor Pointer
Figure 8-27. Maximum Frame Length Register
23
23
[25:0] DMA Rx Buffer Descriptor Pointer
22
22
21 20
21 20
[15:0] Maximum Frame Length
R/W
R/W
R/W
R/W
R/W
R/W
19
19
18 17
18 17
DMA Rx Buffer Descriptor Pointer
DMA Rx Buffer Descriptor Pointer
DMA Rx Buffer Descriptor Pointer
Maximum Frame Length
Maximum Frame Length
16
16
15
15
14
14
13
13
Description
12
12
Description
Maximum Frame Length
11
11
10
10
9
9
8
8
7
7
6
6
5
5
4
4
HDLC CONTROLLERS
3
3
0xFFFFFFFF
0xFFFFFFFF
Reset Value
2
0xXXXX0000
0xXXXX0000
2
Reset Value
1
1
0
0
8-49