AMIS-49587_P2 Datasheet, PDF (30/55 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
http://onsemi.com
30