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參數(shù)資料
| 型號(hào)： | W3100A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | i2Chip W3100A |
| 中文描述： | i2Chip W3100A |
| 文件頁(yè)數(shù)： | 33/63頁(yè) |
| 文件大小： | 557K |
| 代理商： | W3100A |
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port set prior to this transmission are different to the destination IP and port to be used for the transmission,
the values need to be updated before executing the send command.
UDP
UDP starting point
Cx_TW_PR = A
Cx_TR_PR = A
FBS >
SDS(send
data size)
UDP sendto
cal FBS(free
buffer size)
FBS <=
Cx_TW_PR -
Cx_TR_PR
write data
update Cx_TW_PR
send command
Send bit ==
'1'
Yes
No
No
Yes
check previous
send comand
write data from
Cx_TW_PR
Cx_TW_PR <=
Cx_TW_PR + SDS
if need, update
DIP, DPort
0x0000
0x2000
CH3
CH2
CH1
CH0
0x0800
0x1000
0x1800
0x0000
Since transmission memory is
2KB, mask is 0x000007FF
0x0800
0x0000
0x0800
0x0200
Cx_TR_PR
Tx
data
0x0000
0x0800
0x0200
Cx_TW_PR
Pointer Management during UDP Transmission
2KB allocated at
each channel
Cx_TW_PR and
Cx_TA_PR are
equal
(0x00123000
assumed)
Cx_TW_PR is
increased to
0x00123200
(MCU)
Cx_TR_PR is
increased to
0x00123200
(W3100A)
When MCU records the
transmission data for transmission
and Cx_TW_PR is increased
When W3100A
completes the
transmission
Above diagram illustrates the change in Cx_TW_PR and Cx_TA_PR when actual data transmission is made
after 2KB of transmission memory is set at CH0.
UDP Data Reception
W3100A’s UDP reception is similar to TCP reception. The difference is that the header information for
UDP processing is included in the received data in addition to the data. The header is structured as below.
TLEN
SIP
SPort
0
2
6
8
4
UDP data
xx
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