S-7600A Datasheet, PDF (55/60 Pages) Seiko Instruments Inc – Hardware Specification (TCP/IP Network Stack LSI)

TCP/IP Network Stack LSI
S-7600A
Hardware Specification Revision 1.3
Table 8-12
Header Structure
Byte position from head
Implication of each byte
0
The most significant byte of their IP
address
1
The second significant byte of their IP
address
2
The third significant byte of their IP
address
3
The least significant byte of their IP
address
4
The most significant byte of their port
number
5
The least significant byte of their port
number
6
The most significant byte of our port
number
7
The least significant byte of our port
number
8
The most significant byte of UDP
datagram size
9
The least significant byte of UDP
datagram size
10
The most significant byte of UDP
checksum
11
The least significant byte of UDP
checksum
Remarks
8 bytes of UDP
header are not
included here
Each time a byte of data is read out from the Socket Data register, the value of the Buffer In Length
register decrements. When all data is read out, the register value returns to 0x0000. In UDP data
reception, the incoming buffer has a maximum capacity of 2047 bytes, including the 12-byte header. The
application layer is responsible for using the header information and the buffer control to prevent any
overflow in the two incoming buffers.
Seiko Instruments Inc.
8-5