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參數資料
型號: W9961CF
廠商: WINBOND ELECTRONICS CORP
元件分類: 消費家電
英文描述: H.263/H.261 Video Codec
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP208
封裝: 28 X 28 MM, 2.60 MM HEIGHT, PLASTIC, QFP-208
文件頁數: 22/65頁
文件大小: 344K
代理商: W9961CF
W9961CF
- 22 -
4.3 Power On Reset Initialization
During system reset and power up, state of the memory data lines MD[15:0] are latched into the
W9961CF
s internal configuration registers as video subsystem configuration information. Since each
MD[15:0] pin is internally pulled up on their I/O buffers, no external pull-up resistor is required. A 4.7K
ohm resistor to ground is recommended for pull-down. Table 4.2 shows the system power on reset
configuration definitions. 1 is the default value for each bit.
Table 4.2 W9961CF Power On Reset Definitions
MD Bit(s)
Definition
Value
Function
Control Reg.
MD[0]
Video Memory Type
0
1
EDO DRAM
SDRAM
PWON_0
MD[1]
DRAM Size
0
1
256Kx16/32 DRAM
1Mx16 DRAM
PWON_1
MD[3:2]
Analog Video Output
Mode
0X
10
11
RGB Out, TV encoder is off
Composite Video
S-Video + Composite Video
PWON_3-2
MD[5:4]
TV System
00
01
10
11
Reserved
PAL-M
PAL-B, D, G, H, N
NTSC
PWON_5-4
MD[6]
CP2/C/B DAC Control
0
1
OFF
ON
PWON_6
MD[7]
CP1/Y/G DAC Control
0
1
OFF
ON
PWON_7
MD[8]
CP0/R DAC Control
0
1
OFF
ON
PWON_8
MD[9]
VREF Control
0
1
External VREF
Internal VREF
PWON_9
MD[10]
Input Video Mode
0
1
8-bit Mode
16-bit Mode
PWON_10
MD[11]
Internal MCLK Select
0
1
From External MCLK Pin
From Internal PLL
PWON_11
MD[14:12]
Test Mode
000
001
010
PM Test (5K
×
22 bits)
DM Test (1K
×
16 bits)
Reserved
PWON_14-12
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