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UPD77533 Fiches technique(PDF) 46 Page - Renesas Technology Corp

No de pièce UPD77533
Description  MOS INTEGRATED CIRCUIT
PDF  104 Pages
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Fabricant  RENESAS [Renesas Technology Corp]
Site Internet  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD77533 Fiches technique(HTML) 46 Page - Renesas Technology Corp

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Data Sheet S15671EJ4V0DS
44
µµµµPD77533
13.2.2 ACK, NACK in case of extension command
Some extension commands use ACK and NACK, and some do not.
If NACK is sent from the host CPU to the
µPD77533, the same packet is re-sent. The µPD77533 can send the
next packet after receiving ACK from the host CPU.
When a flow point is output from the
µPD77533 to the host CPU, the host CPU must send either ACK or NACK.
The
µPD77533 stops outputting packets until this ACK or NACK is received.
Table 13-5. ACK, NACK for Extension Commands
Command type
EXT-ID
ACK, NACK Control
Flow point setting command
0x00
Not controlled
Flow point output
Other than 0x00
Controlled
(1) Flow point setting command
See Figure 13-1 Local Command Flow.
(2) Flow point output
Figure 13-2. Flow Point Flow
PD77533
µ
Host CPU
Flow point output
Packet re-sent
Example of
normal flow
ACK (format 2)
Flow point output
Timeout or
error occurrence
Flow point output
ACK (format 2)
NACK
Example of
abnormal flow



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