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| 型號： | TDA9950TT/C2,512 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, SOT360-1, MO-153, TSSOP-20 |
| 文件頁數(shù)： | 23/24頁 |
| 文件大小： | 112K |
| 代理商： | TDA9950TT/C2,512 |
TDA9950_1
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 01 — 16 November 2007
8 of 24
NXP Semiconductors
TDA9950
CEC/I2C-bus translator
8.5 Data register protocol
Communication between the TDA9950 and the host using the CEC Data Registers is
carried out using frames of information. The host is the master of all data transfers; the
TDA9950 uses the INT line to inform the host that it has data available.
Before a frame is read or written, the host must set the REG_PTR eld in the Address
Pointer Register to the base CEC Data Register address. Successive reads or writes
automatically increment the REG_PTR as the frame is transferred. Message transfers can
only start from the rst CEC Data Register at address 07h and not from higher addresses,
as messages must be transferred complete and not in fragments.
Each frame consists of a byte count, a service selector and then zero or more (up to 17)
parameters as shown in Figure 3.
Table 12.
ACKL - CEC Address ACK Low register (address 05h) bit description
(Read/Write)
Bit
Symbol
Description
7 to 0
ACKL[7:0]
CEC Address ACK Low register
For each bit:
0 = messages to the corresponding logical address will not be
acknowledged.
1 = messages to the corresponding logical address are
acknowledged and forwarded to the host.
Table 13.
CCONR - CEC Conguration Register (address 06h) bit description (Read/Write)
Bit
Symbol
Description
7 to 5
-
not used
4
ENABLE_ERROR
ENABLE_ERROR:
0 = no specic action.
1 = notify the host of all errors via the TDA9950 Error Register
and via the CECData.err service (see Section 8.5.4).
3
-
not used
2 to 0
RETRY[2:0]
RETRY[2:0]: retry count to be used by the TDA9950. The
maximum value is 5; values greater than 5 will still give 5
retries.
Table 14.
CDR[0:18] - CEC Data Registers (addresses 07h to 19h) bit description
(Read/Write)
Bit
Symbol
Description
7 to 0
FrameByteCount/
ServiceSelector/
Parameters[7:0]
FrameByteCount/ServiceSelector/Parameters:
Length of message in B, Type of message, 17 B for message
content; see Section 8.5 “Data register protocol”.
Fig 3.
Frame format for the data register protocol
001aag924
FrameByteCount
ServiceSelector
[Parameters]
Register CDR0
Register CDR1
Register CDR2
[...]
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