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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)： 34/63頁(yè)
文件大小： 557K
代理商： W3100A
The header is comprised of (1) TLEN Field displaying the size of 2Byte Header + data, (2) 4Byte SIP
displaying the sender IP that transmitted UDP data, and (3) SPort displaying the sender Port. MCU uses
such information to determine whether the data needs to be processed by MCU before processing.
UDP
UDP starting point
Cx_RW_PR = A
Cx_RR_PR = A
RDS >=
recv LEN
UDP receivefrom
cal RDS(recv
data size)
RDS <=
Cx_RW_PR -
Cx_RR_PR
read data
update Cx_RR_PR
recv command
Yes
No
read data from
Cx_RR_PR
Cx_RR_PR <=
Cx_RR_PR +
LEN
recv LEN
processing
UDP data
Above diagram illustrates the MCU processing flow for UDP data. Excluding the header processing for the
UDP data, the basic flow is identical to TCP reception.
0x0000
0x2000
CH3
CH2
CH1
CH0
0x0800
0x1000
0x1800
0x0000
0x0800
0x0200
0x0000
0x0800
0x0200
Cx_RR_PR
Rx
Data
head
0x0000
0x0800
0x0200
Cx_RW_PR
0x0400
0x0400
0x0000
0x0800
0x0200
Cx_RR_PR
Rx
Data
head
0x0400
Rx
Data
head
0x0580
Rx
Data
head
0x0580
0x0000
0x0800
Cx_RW_PR
0x0580
UDP Reception Memory Management for Each Channel
2KB allocated at
each channel
Since reception
memory is 2KB, mask
is 0x000007FF
Cx_RW_PR and
Cx_RR_PR are
equal (0x00123200
assumed)
Cx_RW_PR is
increased to
0x00123400
(W3100A)
Cx_RW_PR is
increased to
0x00123580
(W3100A)
Cx_RR_PR is
increased to
0x00123400
(MCU)
Cx_RR_PR is
increased to
0x00123580
(MCU)
When MCU completes
the processing of the
received data and
Cx_RR_PR is increased
When MCU completes
the processing of the
received data and
Cx_RR_PR is increased
When Cx_RW_PR is
increased by receiving
data from the peer at
W3100A
When Cx_RW_PR is
increased by receiving
data from the peer at
W3100A
At UDP reception buffer, many different data may exist between Cx_RW_PR and Cx_RR_PR. Therefore,
the header information is used to differentiate and process such data. Above diagram illustrates the process
where 2 UDP’s receive the data and processed by MCU.
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