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| 型號： | SAF7843HL |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 存儲器 |
| 英文描述： | One chip CD audio device with integrated MP3-WMA decoder |
| 封裝： | SAF7843HL/M295<SOT486-1 (LQFP144)|<<http://www.nxp.com/packages/SOT486-1.html<1<Always Pb-free,;SAF7849HL/M245<SOT486-1 (LQFP144)|<<http://www.nxp.com/packages/SOT486-1.h |
| 文件頁數(shù)： | 50/93頁 |
| 文件大?。?/td> | 396K |
| 代理商： | SAF7843HL |
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SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
50 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
command byte and its full compliment of parameter bytes). At this point, the PDSIC acts
upon the command and the appropriate function is carried out based upon the values in
the stack space.
There are two special case servo commands: Write_parameter (opcode = 0xA2) and
Write_decoder_reg (opcode = 0xD1).
Write_parameter allows the microcontroller to write directly to any memory location. It
carries two parameter bytes: the memory address and the data that is to be written. When
this command is executed, the command byte is loaded into oldcom and the first
parameter byte (RAM_address) is loaded in the stack. The second parameter byte (data)
is loaded directly to the location specified by the RAM_address.
Write_decoder_reg allows decoder registers to be written to when the I
2
C-bus interface is
being used. This command carries only one parameter byte, which is the decoder
register/data pair (two nibbles). When this command is received by the PDSIC, the
register/data pair is loaded into memory location 0x4D.
The servo read commands operate slightly differently because they carry no parameter
bytes and the lower nibble of the command byte is always 0 to indicate this. When the
PDSIC receives a read command, it will make certain information available (mostly from
memory, although some status information is retrieved from the decoder) on the serial
interface for collection by the microcontroller.
If a sequence of values is being read from the servo RAM (e.g. a series of values related
to a PID loop), it is important to ensure that the values are consistent with each other by
ensuring that the servo has not updated some of the values during the period that they are
being read. To prevent this occurring, an interrupt signal is available from the servo to the
ARM which asserts an IRQ when it is safe to read related values. The interrupt generator
monitors these signals and raises an IRQ whenever the correct state is achieved. The
interrupt is cleared by applying a pulse to the Inreq_Clr register bit. If the interrupt is not
cleared, it will automatically be reset when the valid reading state is no longer true.
Figure 28
shows the operation of the IRQ signal. Int #1 shows the full duration of an
interrupt that does not get cleared by the ARM. Int #2 and Int #3 are shown being cleared
by pulses being written to the Inreq_Clr register. The time between interrupts is
approximately 15
μ
s and the total interrupt cycle time is about 60
μ
s.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAF7843HL/M295,557 | 功能描述:音頻 DSP IC AUD DECODER RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| SAF7846HL/M210,557 | 功能描述:音頻 DSP 1 chip CD Audio Dev w/Integrated decoder RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| SAF7847HL/M201,557 | 功能描述:音頻 DSP 1 chip CD Audio Dev w/Integrated decoder RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| SAF7849HL/M245,557 | 功能描述:音頻 DSP IC AUD DECODER RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| SAF7849HL/M295,557 | 功能描述:音頻 DSP IC AUD DECODER RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
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