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參數資料
型號： W9967BCF
廠商： WINBOND ELECTRONICS CORP
英文描述： JPEG USB Camera Chip(運用JPEG壓縮技術和通用串行總線結構技術的照相電路數字處理芯片的攝像照相機接口控制器)
中文描述： USB相機的JPEG芯片（運用的JPEG壓縮技術和通用串行總線結構技術的照相電路數字處理芯片的攝像照相機接口控制器）
文件頁數： 22/72頁
文件大?。?/td> 756K
代理商： W9967BCF
W9967BCF
- 22 -
7.2 DRAM Control and Interface
The W9967BCF supports 256K
×
16 and 1M
×
16 SDRAM or EDO DRAM in a 0.5 ~ 4 Mbytes
configuration with 16-bit data bus. A single 1M
×
16, -15 or above, SDRAM is recommended for better
cost/performance.
7.2.1 DRAM Access Arbitration
The DRAM arbiter helps to maximize performance by orchestrating memory access requests from
internal engines. Two priority levels are defined for these requests:
First priority: DRAM refresh request and SDRAM mode register write request
Second priority: Capture FIFO write request, DCT read request, VLE read request, VLE FIFO
write request, USB FIFO read request, and USB control read/write request
Programmable FIFO status are provided by the Capture FIFO, VLE FIFO, and USB FIFO such that the
DRAM Controller arbitrates according to these FIFO status to prevent any video data loss and to
achieve the best performance.
7.2.2 DRAM Interface
The DRAM controller provides many programmable controls for the DRAM operations which include:
DRAM Type: supports SDRAM and EDO DRAM
DRAM Address: programmable 9-bit (256K
×
EDO DRAM), 10-bit (1M
×
EDO DRAM or 256K
×
SDRAM), and 12-bit (1M
×
SDRAM) address
DRAM Timing: adjustable Trp, Trcd, Tras, and Tcas timings
DRAM Refresh: 1 ~ 8 refresh cycles per scan line
SDRAM Read Latency: 1 ~ 3 clocks
SDRAM Burst Type: sequential or interleaved
SDRAM Burst Length: 1, 2, 4, 8, or full page
SDRAM Self Refresh
Table 7.2 shows the interface signals for SDRAM and EDO DRAM.
Table 7.2 SDRAM and EDO DRAM Interface Signals
Pin Name
256K
′
EDO DRAM
1M
′
EDO DRAM
256K
′
SDRAM
1M
′
SDRAM
MD[15:0]
MD[15:0]
MD[15:0]
MD[15:0]
MD[15:0]
MA[10:0]
MA[8:0]
MA[9:0]
MA[8:0]
MA[10:0]
BA
BA
BA
RAS[1:0]#/CS[1:0]#
RAS[1:0]#
RAS[1:0]#
CS[1:0]#
CS[1:0]#
CAS[1:0]#/DQM[1:0]
CAS[1:0]#
CAS[1:0]#
DQM[1:0]
DQM[1:0]
相關PDF資料
PDF描述
W9967CF JPEG USB Camera Chip(運用JPEG壓縮技術和通用串行總線結構技術的照相電路數字處理芯片的攝像照相機接口控制器)
W99681CF JPEG USB Dual Mode Camera Chip(運用JPEG壓縮技術、通用串行總線結構技術、雙制式的照相電路數字處理芯片的攝像照相機接口控制器)
W9971CF Integrated Video Graphics Accelerator(集成的視頻圖形加速器)
W9980 Digital Voice Recorder(數字式錄音器)
WA08-2433A 820-980 MHz LOW NOISE BALANCE AMPLIFIER WA08-2433A
相關代理商/技術參數
參數描述
W99681CF 制造商:WINBOND 制造商全稱:Winbond 功能描述:JPEG USB Dual Mode Camera Chip
W99685 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
W99685BS 制造商:WINBOND 制造商全稱:Winbond 功能描述:SYSTEM CAMERA DEVICE
W99685FS 制造商:WINBOND 制造商全稱:Winbond 功能描述:SYSTEM CAMERA DEVICE
W9968CF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Camera
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