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參數(shù)資料
| 型號： | PCI1221GHK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | KPT 11C 11#16 SKT PLUG |
| 中文描述： | PC卡控制器 |
| 文件頁數(shù)： | 28/123頁 |
| 文件大小： | 1659K |
| 代理商： | PCI1221GHK |
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PCI1221 GHK/PDV
PC CARD CONTROLLERS
SCPS042 – JULY 1998
28
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
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 0 (card A) activity, and LEDA2 indicates
socket 1 (card B) activity. The LED_SKT output indicates socket activity to either socket 0 or socket 1. Refer
to the multifunction routing registerdescription
on page 62 for details on configuring the multifunction terminals.
The LED signal is active high and is driven for 64-ms durations. When the LED is not being driven high, it is driven
to a low state. Either of the two circuits shown in Figure 7 can be implemented to provide LED signaling, and
it is left for the board designer to 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.
PCI1221
Application-
Specific Delay
Current Limiting
R
≈
500
LED
PCI1221
Current Limiting
R
≈
500
LED
Figure 7. 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, the counter is reset and the LED signal remains
driven. If socket activity is frequent (at least once every 64 ms), the LED signals remain driven.
CardBus socket registers
The PCI1221 contains all registers for compatibility with the latest PCI-to-PCMCIA CardBus bridge
specification. These registers exist as the CardBus socket registers, and are listed in Table 7.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCI1221PDV | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| PCI1225 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:PC CARD CONTROLLERS |
| PCI1225GHK | 制造商:Texas Instruments 功能描述: |
| PCI1225PDV | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| PCI-1240U | 制造商:ADVANTECH 制造商全稱:Advantech Co., Ltd. 功能描述:4-axis Stepping and Servo Motor Control Universal PCI Card |
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