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參數(shù)資料
| 型號： | TLV320AIC27IPFB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 38/54頁 |
| 文件大?。?/td> | 732K |
| 代理商： | TLV320AIC27IPFB |
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TLV320AIC27
STEREO AUDIO CODEC
SLAS253A – MARCH 2000 – REVISED SEPTEMBER 2000
43
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
register 3Eh – extended modem status control
The extended modem status and control register functions similarly to the original AC’97 power-down
control/status register, located at index 26h. The (A)MC ’97 Codec must restrict modem and handset
power-down control/status to this register since all of the functions are provided here. Therefore, the (A)MC’97
codec (and AC’97 digital controller, of course) must ignore bits MDM and PR7 in register 26h and use what is
included here. When the GPIO section is powered down, all outputs must be 3-state and input slot 12 should
be marked invalid when the ac link is active. When slot 12 is invalid, register 54h (GPIO pin status register) will
report 0s. In addition the codec should force SDATA_IN slot 12 to all 0s. Bits 7 to 0 are read only, 1 indicates
modem AFE subsystem readiness
D GPIO = 1 indicates GPIO ready
D MREF = 1 indicates modem VREFs up to nominal level
D ADC1 = 1 indicates modem line1 ADC ready
D DAC1 = 1 indicates modem line1 DAC ready
D ADC2 = 1 indicates modem line2 ADC ready – supported on TLV320AIC27 when in DLM is set
D DAC2 = 1 indicates modem line2 DAC ready –supported on TLV320AIC27 when DLM is set
D HADC = 1 indicates handset ADC ready – not supported on TLV320AIC27
D HDAC = 1 indicates handset DAC ready – not supported on TLV320AIC27
Bits 15 to 8 are read/write and control modem AFE subsystem power down. TLV320AIC27 power-up/down
functions are entirely controlled from register 26h. However, the following registers are aliased onto the
appropriate control bits in registers 26h.
D PRA = 1 indicates GPIO power-down
D PRB = 1 indicates modem VREF off – no separate modem VREF on TLV320AIC27, aliases from PR3
D PRC = 1 indicates modem line1 ADC off – aliases from PR0
D PRD = 1 indicates modem line1 DAC off – aliases from PR1
D PRE = 1 indicates modem line2 ADC off – not supported on TLV320AIC27
D PRF = 1 indicates modem line2 DAC off – not supported on TLV320AIC27
D PRG = 1 indicates handset ADC off – not supported on TLV320AIC27
D PRH = 1 indicates handset DAC off – not supported on TLV320AIC27
Bits 7 to 0 are read only, 1 indicates modem AFE subsystem readiness. Bits 15 to 8 are read/write and control
modem AFE subsystem power down. Writing ENABLES (0) to the above aliased PR bits is allowed and will write
enable to appropriate PRN bit. However, writing DISABLES (1) is not allowed.
register 40h – line1 ADC DAC sample rate
This read/write register 40h controls the modem DAC and ADC sample rate. This register is only functional if
modem mode1 = 1 is selected from pins 30 and 40. The ADC will only use this sample rate if in addition, the
input to the Record Mux is selected, as Right ADC is PHONE in register 1Ah. Note only the recommended
sample rates are supported. If alternative sample rates are selected the rate will default to the nearest sample
rate supported, and that value will be read back
register 46h to 48h – line1 and line2 ADC level
These registers are not supported in TLV320AIC27, register 04h being used to control TX modem level.
register 56h – miscellaneous modem AFE status/control
This read/write register defines the loop back modes available for the modem line and handset ADCs/DACs
described in the Intel specification. Line1 ADC loopback mode 001 L1B0 is supported.
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