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UPD77533 Datasheet(PDF) 49 Page - Renesas Technology Corp

Part # UPD77533
Description  MOS INTEGRATED CIRCUIT
PDF  104 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD77533 Datasheet(HTML) 49 Page - Renesas Technology Corp

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Data Sheet S15671EJ4V0DS
47
µµµµPD77533
14.1.3 Server commands
When sending server commands to the
µPD77533, do not send the next command until a command response is
returned.
Multiple commands may be sent consecutively from the LS, but in this case, pool the commands from the LS on
the host CPU side and make sure that only one command is sent to the
µPD77533 at a time.
For command response, because packet transmission/reception can be managed via ACK and NACK, there is no
problem as long as the packet from the
µPD77533 is received without delay in the one-packet buffer provided on the
host CPU side.
Figure 14-3. Server Command Flow (with No Hardware Flow Control)
PD77533
µ
Host CPU
LS
Response
The PD77533 sends the next
packet after receiving ACK.
Before this, a response is sent to the LS.
µ
Command
ACK
ACK
Response
Command
Response 1
Command 1
ACK
ACK
Response 2
Command 2
ACK
ACK
Command 1
Command 2
Response 2
Response 1
If command 2 is sent before a response
to command 1 is returned, command 2 is
held pending.
The next command can be sent now.



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