S7600A datasheet(45/60 Pages) SII

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TCP/IP Network Stack LSI

S-7600A

Hardware Specification Revision 1.3

Seiko Instruments Inc.

7-18

Table 7-40

Socket Interrupt High Register Description

Bit

Bit Name

Access

Description

URG

R/W

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.

RST

R/W

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.

Term

R/W

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.

ConU

R/W

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 Data Pointer 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.

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