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參數資料
| 型號： | W3100A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | i2Chip W3100A |
| 中文描述： | i2Chip W3100A |
| 文件頁數： | 29/63頁 |
| 文件大小： | 557K |
| 代理商： | W3100A |
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TCP Transmission Memory Size Set-up
W3100A transmission memory is comprised of 8KB in total, and the size can be assigned for each channel
through TMSR register. An example of TMSR and each memory size is illustrated in the diagram below.
When the memory size from channel 0 exceeds 8KB, all ensuing memory is ignored.
0x0000
0x2000
CH3
CH2
CH1
CH0
0x0800
0x1000
0x1800
TMSR <= 0x55
0x0000
0x2000
CH3
CH2
CH1
CH0
0x0800
0x1000
0x0400
1KB, 1KB, 2KB, 4KB allocated
TMSR <= 0x90
0x0000
0x2000
CH0
0x1000
8KB allocated at channel 0
TMSR <= 0x03
Remaining channels are not used
TCP Data Transmission Process
ESTABLISHED
TCP starting point
Cx_TW_PR = A
Cx_TA_PR = A
FBS >
SDS(send
data size)
TCP send
cal FBS(free
buffer size)
FBS <=
Cx_TW_PR -
Cx_TA_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
In order to execute W3100A TCP transmission, 4Byte pointer of Cx_TW_PR (Tx Write Pointer Register of
Channel x) and Cx_TA_PR (Tx Ack Pointer Register of Channel x) is used. Cx_TW_PR is the pointer that
writes the data to be transmitted from MCU, and Cx_TA_PR is the pointer that completed W3100A
transmission. Cx_TW_PR and Cx_TA_PR become equal after connection set-up is made. In active open,
they are equally initialized under the sock_init command from MCU. In passive open, one is initialized by
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