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| 型號： | PONE-000-01 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | The ideal device for simple nodes, such as switches, actuators and sensor |
| 中文描述： | 在簡單的節(jié)點，如交換機，執(zhí)行器和傳感器的理想設(shè)備 |
| 文件頁數(shù)： | 17/56頁 |
| 文件大?。?/td> | 432K |
| 代理商： | PONE-000-01 |
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March 2000
CEWay
PL-One Data Sheet
D-CW-0100-04
Page 17 of 56
PLSES State Transition Table
State
Description
INIT State
The SES block goes into INIT state only after a hardware reset, or after
the PL-One firmware sets the Ph_Request_Reg
hw_reset
bit. Two
steps are required for the PL-One firmware to fully initialize the PLSES
and get it to the IDLE state.
1. The PLSE registers must be initialized by writing the following
sequence of bytes:
Write DC hex to Ph_Tx_Buffer
Write 30 hex to Ph_Request_Reg
Write DC hex to Ph_Tx_Buffer
Write 30 hex to Ph_Request_Reg
Write 14 hex to Ph_Tx_Buffer
Write 30 hex to Ph_Request_Reg
Write 20 hex to Ph_Request_Reg
Write 00 hex to Ph_Request_Reg
2. Second, an initial Preamble value must be written to Ph_Tx_Buffer,
which is used as-is for the first transmitted packet. It is also used
as a seed for the generation of pseudo-random Preamble values
for subsequent transmitted frames.
After these two steps, the SES finishes its initialization routine and
goes into the IDLE state.
IDLE State
In this state the SES has been initialized, is not transmitting a frame,
and the channel is quiet. For each unit symbol time (UST) that passes,
the SES block will send a PLSES Handshake Interrupt to the PL-One
firmware, indicating that there is no activity on the channel.
Transition
The SES block will go from IDLE to XMIT_PRE_SYM when the
command to transmit a PEOF is written to Ph_Request_Reg (101X
0110 bin).
Transition
The SES block will go from IDLE to RCV_PRE_SYM when a
SUPERIOR state has been detected on the channel.
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