fined in the AC ’97 Specification: Cold AC ’97" />
參數資料
型號: CS4299-BQZ
廠商: Cirrus Logic Inc
文件頁數: 27/52頁
文件大?。?/td> 0K
描述: IC CODEC AC'97 W/SRC 48LQFP
標準包裝: 250
系列: SoundFusion™
類型: 音頻編解碼器 '97
數據接口: 串行
分辨率(位): 18 b,20 b
ADC / DAC 數量: 1 / 1
三角積分調變:
動態(tài)范圍,標準 ADC / DAC (db): 80 / 85
電壓 - 電源,模擬: 4.75 V ~ 5.25 V
電壓 - 電源,數字: 4.75 V ~ 5.25 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 48-LQFP
供應商設備封裝: 48-LQFP(7x7)
包裝: 托盤
其它名稱: 598-1626
CS4299-BQZ-ND
CS4299
33
5. POWER MANAGEMENT
5.1
AC ’97 Reset Modes
The CS4299 supports three reset methods, as de-
fined in the AC ’97 Specification: Cold AC ’97 Re-
set, Warm AC ’97 Reset, Register AC ’97 Reset. A
Cold Reset results in all AC ’97 logic (registers in-
cluded) initialized to its default state. A Warm Re-
set leaves the contents of the AC ’97 register set
unaltered. A Register Reset initializes only the
AC ’97 registers to their default states.
5.1.1
Cold AC ‘97 Reset
A Cold Reset is achieved by asserting RESET# for
a minimum of 1 s after the power supply rails
have stabilized. This is done in accordance with the
minimum timing specifications in the AC ’97 Seri-
al Port Timing section on page 7. Once deasserted,
all of the CS4299 registers will be reset to their de-
fault power-on states and the BIT_CLK and
SDATA_IN signals will be reactivated.
5.1.2
Warm AC ’97 Reset
A Warm Reset allows the AC-link to be reactivated
without losing information in the CS4299 registers.
A Warm Reset is required to resume from a D3hot
state, where the AC-link had been halted yet full
power had been maintained. A primary codec
Warm Reset is initiated when the SYNC signal is
driven high for at least 1 s and then driven low in
the absence of the BIT_CLK clock signal. The
BIT_CLK clock will not restart until at least 2 nor-
mal BIT_CLK clock periods (162.8 ns) after the
SYNC signal is deasserted. A Warm Reset of the
secondary codec is recognized when the primary
codec on the AC-link resumes BIT_CLK genera-
tion. The CS4299 will wait for BIT_CLK to be sta-
ble to restore SDATA_IN activity and/or S/PDIF
transmission on the following frame.
5.1.3
Register AC ’97 Reset
The third reset mode provides a Register Reset to
the CS4299. This is available only when the
CS4299 AC-link is active and the Codec Ready bit
is ‘set’. The audio (including extended audio) reg-
isters (Index 00h - 38h) and the vendor specific reg-
isters (Index 5Ah - 7Ah) are reset to their default
states by a write of any value to the Reset Register
(Index 00h).
DS319PP6
33
CS4299
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