參數(shù)資料
型號: PCI1520-EP
英文描述: Military Enhanced Plastic PC Card Controllers Data Manual
中文描述: 軍事增強塑料PC卡控制器數(shù)據(jù)手冊
文件頁數(shù): 34/125頁
文件大?。?/td> 716K
代理商: PCI1520-EP
3
6
CRT
VGA
Controller
Audio
Codec
PCI1520
19
4
Zoomed Video
Port
PCM
Audio
Input
PCI Bus
PC Card
Interface
Video
Audio
19
4
PC Card
Motherboard
Speakers
Figure 3
4. Zoomed Video Implementation Using the PCI1520
Not shown in Figure 3
4 is the multiplexing scheme used to route either socket 0 or socket 1 ZV source to the graphics
controller. The PCI1520 provides ZVSTAT, ZVSEL0, and ZVSEL1 signals on the multifunction terminals to switch
external bus drivers. Figure 3
5 shows an implementation for switching between three ZV streams using external
logic.
ZVSTAT
ZVSEL0
ZVSEL1
PCI1520
2
0
1
Figure 3
5. Zoomed Video Switching Application
Figure 3
5 illustrates an implementation using standard three-state bus drivers with active-low output enables.
ZVSEL0 is an active-low output indicating that the socket 0 ZV mode is enabled, and ZVSEL1 is an active-low output
indicating that socket 1 ZV is enabled. When both sockets have ZV mode enabled, the PCI1520 by defaults indicates
socket 0 enabled through ZVSEL0; however, bit 5 (PORT_SEL) in the card control register (see Section 4.32) allows
software to select the socket ZV source priority. Table 3
3 illustrates the functionality of the ZV output signals.
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