tda9950 NXP Semiconductors, tda9950 Datasheet - Page 9

• Manufacturer Part Number: tda9950
• Description: Tda9950 Cec/i?c-bus Translator
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA9950_1
Product data sheet
8.5.1 CECData.req service
8.5.2 CECData.cnf service
The FrameByteCount indicates the number of bytes in the frame (including the
FrameByteCount itself). The service is specified by the ServiceSelector (see
The remaining bytes of the frame, if any, contain the parameters associated with a
particular service. The maximum length of a frame is 19 bytes. The TDA9950 will only
accept a single outstanding request. Reading message bytes beyond FrameByteCount
will return FFh.
Table 15
ServiceSelector is sent to the TDA9950 it will respond with the confirmation Bad .req
service (see
sections are mandatory. No service contains optional parameters.
Table 15.
This service is used to transfer CEC message data. The parameters for the service are
shown in
complete message has been received by the TDA9950 (subject to the appropriate Signal
Free Time rules being satisfied).
Table 16.
This service is used by the TDA9950 to inform the host of the success or other result of a
CECData.req service. The parameters are shown in
Table 17.
ServiceSelector
00h
01h
81h
82h
83h
Parameter
AddressByte
DataBytes
Parameter
ResultCode
shows the organization of the ServiceSelector values. If an unused
Table
CEC Data services
Parameters for CECData.req service
Parameters for CECData.cnf service
Table
16. Transmission of the CEC message commences as soon as the
Comments
A value indicating the result
of the transmission
Comments
Source and destination logical addresses in the form SSSS DDDD
Bytes of message data up to the data length indicated by FrameByteCount
17). For every service, the parameters that are defined in the following
From host to TDA9950
CECData.req
Rev. 01 — 16 November 2007
Value
00h
80h
81h
82h
83h
84h
85h
86h
From TDA9950 to host
CECData.cnf
CECData.ind
(indication, no TDA9950 error)
CECData.err
(no indication, TDA9950 error)
CECData.ier
(indication, TDA9950 error)
Table
Meaning
Success
TDA9950 in off state
Bad .req service
Failed, unable to access CEC line
Failed, arbitration error
Failed, bit timing error
Failed, destination address not
acknowledged
Failed, data byte not acknowledged
17.
CEC/I
TDA9950
© NXP B.V. 2007. All rights reserved.
2
C-bus translator
Table
Section
8.5.1
8.5.2
8.5.3
8.5.4
8.5.5
15).
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