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ET1100 데이터시트(HTML) 99 Page - Beckhoff Automation GmbH & Co. KG

부품명 ET1100
상세내용  Slave Controller
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제조사  BECKHOFF [Beckhoff Automation GmbH & Co. KG]
홈페이지  https://beckhoff.com/
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ET1100 데이터시트(HTML) 99 Page - Beckhoff Automation GmbH & Co. KG

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PDI Description
Slave Controller
– ET1100 Hardware Description
III-85
6.5.4
µController connection using Byte Select signals (BSn)
In case the µController does not provide Byte High Enable, and Byte Select signals (BS2, and BS3 for
32 bit µController) are available, they can be used to distinguish between 8 and 16 bit accesses. The
signal BS3 (active low) is equivalent to ADR[0], and BS2 (active low) is equivalent to BHE (active low).
For Byte Select mode the Byte access mode configuration bit has to be set to zero (BHE or Byte
Select mode).
Table 76: Byte Select vs. A[0] and BHE
µController
EtherCAT device
Access
ADR[0]
nBS3
nBS2
ADR[0]
BHE
(act. low)
0
0
0
0
0
16 bit access (low and high byte)
0
0
1
0
1
8 bit access (low byte, even address)
1
1
0
1
0
8 bit access (high byte, odd address)
1
1
1
1
1
invalid access


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