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IA63484 参数 Datasheet PDF下载

IA63484图片预览
型号: IA63484
PDF下载: 下载PDF文件 查看货源
内容描述: 高级CRT控制器 [Advanced CRT Controller]
分类和应用: 控制器
文件页数/大小: 32 页 / 147 K
品牌: INNOVASIC [ INNOVASIC, INC ]
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IA63484  
Data Sheet  
Advanced CRT Controller  
I/O SIGNAL DESCRIPTION:  
The diagram below describes the I/O characteristics for each signal on the IC. The signal names  
correspond to the signal names on the pinout diagrams provided.  
I/O Characteristics:  
Signal Name  
res_n  
I/O  
I
Group  
Description  
ACRTC reset:  
Data bus (three state): are the bidirectional data bus to the host mpu or dmac. D0 -D  
are used in 8-bit data bus mode.  
I/O  
d[15,0]  
rw_n  
cs_n  
I
I
Read/write strobe: controls the direction of host/ACRTC transformers.  
Chip Select: enables transfers between the host and the ACRTC.  
Register Select: selects the ACRTC register to be accessed. It is usually connected to  
the least significant bit of the host address bus.  
MPU  
Interface  
I
rs  
Data transfer acknowledge (three state): output provides asynchronous bus cycle  
timing. It is compatible with the HD68000 mpu dtack output.  
Interrupt request (open drain): output generates interrupt service requests to the  
host MPU.  
DMA request: recieves DMA acknowledge timing from the host DMAC.  
DMA acknoledge:  
O
O
dtack_n  
irq_n  
dreq_n  
dack  
I
DMAC  
I/O  
Interface DMA done: terminates DMA transfer. It is compatible with the HD68450 DMAC  
DONE signal.  
I
I/O  
O
done_n  
clk_2  
ARTC clock: is the baasic operating clock, twice the frequency of the dot clock.  
Multiplexed frame buffer address/data bus: are the multiplexed frame buffer  
address/data bus.  
Address strobe: output demultiplexes the address/data bus.  
Higer-order address bits/character screen rastar address:MA16/R0- MA19/RA3 are  
the upper bits of the graphics screen ddress multiplexed with th lower bits of the  
character screen raster address.  
mad[15,0]  
as_n  
O
MA16/R0-*  
MA19/RA3  
O
Higer-order character screen rastar address bit: is the high bit of the character screen  
raster address (up to 32 rasters.)  
O
O
RA4  
chr  
Graphic or character screen access: output indicates whether a graphic or character  
screen is being accessed.  
Frame buffer memory acess timing signal: is the frame buffer access timing output,  
CRT  
O
O
O
mcyc  
mrd  
1/2 the frequency of clk_2.  
Interface  
Frame buffer memory read: output controls the frame buffer data bus direction.  
Draw/refresh signal: output differentiates between drawing and CRT displayrefresh  
cycles.  
draw_n  
Display enable: programmable display enable outputs can enable, disable, and blanck  
logical screens.  
O
disp1, disp2  
Coursor Display: outputs provides cursor timing programmed by ACRTC parameters  
such as cursor definition, cursor mode, cursor address, etc.  
CRT vertical sync pulse: outputs the crt vertical synchronization pulse.  
CRT horizontal sync pulse: outputs the crt horizontal synchronization pulse.  
External sync:allows synchronization between multiple ACRTSs and other videro  
signal generators.  
cud1, cud2  
vsync_n  
hsync_n  
O
I/O  
I
exsync_n  
lpstb  
Lightpen strobe: is the lightpen input  
Copyright ã 2001  
innovASIC  
ENG 21101041200  
www.innovasic.com  
Customer Support:  
The End of Obsolescenceä  
Page 4 of 32  
1- 888- 824- 4184