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7.2.5 Buffer memories used for the on-demand function
This section describes the buffer memories used for channel 1 in the on-demand function.
For channels 2 to 4, store information in the same way as channel 1. ( Page 37, Section 3.4)
(1) Send request flag (buffer memory address: 5632 (1600H))
This flag requests on-demand data to be sent from the Ethernet adapter module to an external device.
(2) Send completed flag (buffer memory address: 5633 (1601
H
))
This flag checks if on-demand data has been sent from the Ethernet adapter module to an external device.
*1
*1 The on-demand function in the Ethernet adapter module does not check whether an external device has received on-
demand data because Send completed flag turns on when the data has been sent. Even when the protocol is TCP, Send
completed flag turns on before an ACK response is received from the external device.
(3) Completion code (buffer memory address: 5634 (1602
H
))
The Ethernet adapter module stores the result of the on-demand data sent to an external device (error code).
( Page 157, Section 9.5)
b15 b1 b0to
Send request bit
0: Clear
1: Send request
0
b15 b2 b1 b0to
Send completed bit
0: Clear
1: Send completed
Send error bit
0: Clear
1: Send error
0