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UM0934 Datasheet(PDF) 44 Page - STMicroelectronics

Part # UM0934
Description  ST7570 S-FSK power line networking System-on-Chip
PDF  113 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0934 Datasheet(HTML) 44 Page - STMicroelectronics

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Host interface
UM0934
44/113
Doc ID 17389 Rev 2
In the case of an NAK response from the external host, the ST7570 repeats the frame only
once after a delay corresponding to TWBC (wait before continue).
A missed response from the external host or a framing error when an ACK character is
awaited is considered as an acknowledgment.
5.2.3
Host interface timeouts
All the default values of host interface time-outs are reported in Table 14
.
5.3
Command codes
Each command frame exchanged between the host controller and the ST7570 carries a
command, identified by a unique command code (declared in the command code field as in
Figure 15
).
It is possible to distinguish three different commands types:
●
Request commands sent by the external host to use an ST7570 service
●
Confirm/Error commands sent by the ST7570 to answer a previous request command
●
Indication commands sent by the ST7570 to inform the external host of a change on its
services; these are unsolicited commands not following any request.
Table 15
lists all the available commands, grouped according to the different types of
services offered by the ST7570.
Table 14.
Host interface timeout values
Timeout
Default value [ms]
TACK
40
TPOLL
20
TSR
200
TWBC
5
TIC
10
Table 15.
List of available command codes
Group
Command
Code
Synchronization
CMD_SynchroIndication
10h
CMD_DesynchroRequest
11h
CMD_SynchroStatus
85h
Reset
CMD_ResetRequest
21h
MIB
CMD_WriteDBRequest
41h
CMD_WriteDBConfirm
42h
CMD_WriteDBError
43h
CMD_ReadDBRequest
90h
CMD_ReadDBConfirm
91h
CMD_ReadDBError
92h



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