AMIS-49587_15 Datasheet, PDF (31/56 Pages) ON Semiconductor – Power Line Carrier Modem

T_REQ
AMIS−49587
t_POLL
TxD
Status Message
tSR
ACK
t ACK
RxD
Local Frame from Base Micro
Figure 26. Transfer from Application Microcontroller to AMIS−49587
If the length and the checksum of the local frame are both
correct, the AMIS−49587 acknowledges with an <ACK>
character. In other cases, it answers with a <NAK>
character. In case of <NAK> response, or no
acknowledgement from AMIS−49587 in the t_ACK time−out,
a complete sequence must be restarted to repeat the frame.
6.4.6 Transfer from AMIS−49587 to Application
Microcontroller
When the AMIS−49587 wants to send a frame, it can
directly send it without any previous request.
T_REQ
TxD
Local Frame from
AMIS−49587
Local Frame from
AMIS−49587
Local Frame from
AMIS−49587
t_ACK
t _WBC
t_ACK
t_WBC
RxD
NAK
ACK
Figure 27. Transfer from AMIS−49587 to Application Microcontroller
If the length and the checksum of the local frame are both
correct, the application micro controller acknowledges with
an <ACK> character. In other cases, it answers with a
<NAK> character. In case of <NAK> response from the
Application micro controller, the AMIS−49587 will repeat
the frame only once after a delay corresponding to t_WBC
(Wait Before Continue). A non response from the
application micro controller or a framing error when an
<ACK> character is awaited is considered as an
acknowledgment.
6.4.7 Character Time−out in Reception
The time between two consecutive characters in a local
frame should not exceed t_IC (Time−out Inter Character):
t_IC
Character
Character
t
Figure 28. Character Time−out
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