參數(shù)資料
型號: PCI6611
廠商: Texas Instruments, Inc.
英文描述: DUAL/SINGLE SOCKET CARDBUS AND ULTRAMEDIA CONTROLLER
中文描述: 雙/單插槽CardBus和UltraMedia控制器
文件頁數(shù): 56/204頁
文件大?。?/td> 860K
代理商: PCI6611
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38
Speaker
Subsystem
BINARY_SPKR
System
Core Logic
PCI6x21/
PCI6x11
CAUDPWM
SPKROUT
PWM_SPKR
Figure 34. SPKROUT Connection to Speaker Driver
3.5.9
LED Socket Activity Indicators
The socket activity LEDs are provided to indicate when a PC Card is being accessed. The LEDA1 and LEDA2 signals
can be routed to the multifunction terminals. When configured for LED outputs, these terminals output an active high
signal to indicate socket activity. LEDA1 indicates socket A (card A) activity, and LEDA2 indicates socket B (card B)
activity. The LED_SKT output indicates socket activity to either socket A or socket B. See Section 4.36,
Multifunction
Routing Status 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 35 can be implemented to provide LED signaling, and the board designer must
implement the circuit that best fits the application.
The LED activity signals are valid when a card is inserted, powered, and not in reset. For PC Card-16, the LED activity
signals are pulsed when READY(IREQ) is low. For CardBus cards, the LED activity signals are pulsed if CFRAME,
IRDY, or CREQ are active.
PCI6x21/
PCI6x11
Current Limiting
R
150
Socket A
LED
MFUNCx
Current Limiting
R
150
Socket B
LED
MFUNCy
Figure 35. Two Sample LED Circuits
As indicated, the LED signals are driven for a period of 64 ms by a counter circuit. To avoid the possibility of the LEDs
appearing to be stuck when the PCI clock is stopped, the LED signaling is cut off when the SUSPEND signal is
asserted, when the PCI clock is to be stopped during the clock run protocol, or when in the D2 or D1 power state.
If any additional socket activity occurs during this counter cycle, then the counter is reset and the LED signal remains
driven. If socket activity is frequent (at least once every 64 ms), then the LED signals remain driven.
3.5.10 CardBus Socket Registers
The PCI6x21/PCI6x11 controller contains all registers for compatibility with the
PCI Local Bus Specification
and the
PC Card Standard
. These registers, which exist as the CardBus socket registers, are listed in Table 36.
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