S-7600A Datasheet, PDF (43/55 Pages) Seiko Instruments Inc – Hardware Specification (TCP/IP Network Stack LSI)

S-7600A
Hardware Specification
Table 7-40
Socket Interrupt High Register Description
Bit
Bit Name
7 URG
6 RST
5 Term
4 ConU
Access
R/W
R/W
R/W
R/W
Description
This interrupt is generated when urgent data arrives.
The system interface should read the Urgent Data
Pointer register to see the location of the data.
Writing a “1” to this bit clears the interrupt.
This interrupt is generated when a TCP peer sends
the socket RST flag indicating that the current TCP
session is not valid. Writing a “1” to this bit clears this
interrupt. When this condition occurs, the hardware
no longer operates and re-initializing the socket is
recommended.
This interrupt is generated when the socket
connection is terminated and a TCP FIN flag is
received. Writing a “1” to this bit clears the interrupt.
This interrupt is generated when a connection is
established. Writing a “1” to this bit clears the
interrupt.
7.3.23. Socket Data Register (0x2E)
(Memory Mapped Read/Write, Default 0x00)
This register is used by a system controller to read incoming data packets and write outgoing data.
Data transmissions start for TCP connections only after a write occurs at 0x30.
7.3.24. TCP Data Send and Buffer Out Length Registers (0x30 - 0x31)
(Read/Write, Default 0x03FF)
When read, these registers report the amount of space available in the outgoing buffer. Register 0x30
stores the least significant byte; 0x31 stores the most significant byte. Writing any data to 0x30 causes
data transmissions to start on TCP connections.
7.3.25. Buffer In Length Registers (0x32-0x33)
(Read-Only, Default 0x0000)
These read-only registers report the amount of data available in the received data buffer. 0x32 stores
the least significant byte; 0x33 stores the most significant byte.
7.3.26. Urgent Pointer / UDP Datagram Size Registers (0x34-0x35)
(Read-Only, Default 0x0000)
These read-only registers report the offset to the start of urgent data (as marked through the TCP
header) relative to the incoming data buffer. Register 0x34 stores the least significant byte; 0x35 stores
the most significant byte. When a socket is configured as a UDP socket, these registers indicate the
size of the current UDP datagram. The least significant byte is stored in 0x34 and the most significant
byte is stored in 0x35.
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