參數(shù)資料
型號： PCI1510ZVF
廠商： Texas Instruments, Inc.
英文描述： PC CARD CONTROLLERS
中文描述： PC卡控制器
文件頁數(shù)： 46/128頁
文件大小： 735K
代理商： PCI1510ZVF
38
3.5.7
SPKROUT and CAUDPWM Usage
SPKROUT carries the digital audio signal from the PC Card to the system. When a 16-bit PC Card is configured for
I/O mode, the BVD2 terminal becomes SPKR. This terminal is also used in CardBus binary audio applications, and
is referred to as CAUDIO. SPKR passes a TTL-level digital audio signal to the controller. The CardBus CAUDIO signal
also can pass a single-amplitude binary waveform. The binary audio signal from the PC Card socket is used in the
controller to produce SPKROUT. This output is enabled by bit 1 (SPKROUTEN) in the card control register (PCI offset
91h, see Section 4.32).
Older controllers support CAUDIO in binary or PWM mode but use the same terminal (SPKROUT). Some audio chips
may not support both modes on one terminal and may have a separate terminal for binary and PWM. The
implementation includes a signal for PWM, CAUDPWM, which can be routed to an MFUNC terminal. Bit 2
(AUD2MUX), located in the card control register, is programmed to route a CardBus CAUDIO PWM terminal to
CAUDPWM. See Section 4.30,
Multifunction Routing Register
, for details on configuring the MFUNC terminals.
Figure 36 provides an illustration of a sample application using SPKROUT and CAUDPWM.
Speaker
Subsystem
BINARY_SPKR
System
Core Logic
PCI1510
CAUDPWM
SPKROUT
PWM_SPKR
Figure 36. Sample Application of SPKROUT and CAUDPWM
3.5.8
LED Socket Activity Indicators
The socket activity LED is provided to indicate when a PC Card is being accessed. The LED_SKT signal can be routed
to the multifunction terminals. When configured for LED output, this terminal outputs an active high signal to indicate
socket activity. See Section 4.30,
Multifunction Routing Register
,
for details on configuring the multifunction
terminals.
The active-high LED signal is driven for 64-ms. When the LED is not being driven high, it is driven to a low state. Either
of the two circuits shown in Figure 37 can be implemented to provide LED signaling, and the board designer must
implement the circuit that best fits the application.
The LED activity signal is valid when a card is inserted, powered, and not in reset. For PC Card-16, the LED activity
signal is pulsed when READY/IREQ is low. For CardBus cards, the LED activity signal is pulsed if CFRAME, IRDY,
or CREQ are active.
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