參數(shù)資料
型號(hào)： TMS320AV220
廠商： Texas Instruments, Inc.
英文描述： Video CD MPEG Decoder(視頻CD MPEG編碼器)
中文描述： 視頻CD MPEG解碼器（視頻光盤(pán)的MPEG編碼器）
文件頁(yè)數(shù)： 5/31頁(yè)
文件大?。?/td> 612K
代理商： TMS320AV220
TMS320AV220
VIDEO CD MPEG DECODER
SCSS016A – JUNE 1994 – REVISED JANUARY 1996
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions (Continued)
TERMINAL
NAME
I/O
DESCRIPTION
NO.
PD23
PD22
PD21
PD20
PD19
PD18
PD17
PD16
PD15
PD14
PD13
PD12
PD11
PD10
PD9
PD8
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
158
156
155
154
153
151
150
149
148
146
145
144
142
140
139
138
136
133
132
131
130
128
127
126
O
Pixel data bus. The ’AV220 transmits pixel data to the video display subsystem using PD23–PD0.
Each 24-bit word on PD23–PD0 contains eight bits each of blue (PD23–PD16), green (PD15–PD8),
and red (PD7–PD0). The highest bit of each component is most significant; (i.e., blue7 corresponds
to PD23).
The ’AV220 can be configured to output the pixel data in the YCbCr color space. When the YCbCr
format is selected, the luminance (Y) values are output on PD15–PD8. The Cb and Cr coefficients
alternate on successive VCLK periods and are output on PD7–PD0. PD23–PD16 are not used when
YCbCr is selected.
PD23–PD0 tie directly to the D23–D0 inputs of the TMS320AV420 NTSC encoder.
RAS1
RAS0
48
49
O
DRAM row-address strobe. The ’AV220 asserts these signals to latch the row address into the local
DRAM array. RAS0 (active low) latches the row address. RAS1 is reserved and should not be
connected.
RD
89
I
Read strobe, active low. RD is used by the host when reading ’AV220 registers.
RESET
78
I
Reset, active low. RESET is required to first initialize the device on power up. RESET low clears all
buffers, resets the video decoder core, downloads microcode, and initializes registers. The host can
not read or write registers or memory (DRAM) until the reset sequence is completed, in not more then
25 ms. If a register access is attempted during the reset period, the chip activates the WAIT line until
the reset is completed. The CD interface does not accept data during this time. The ’AV220 does not
activate CDREAD until the reset sequence is completed. RESET low causes ARESET to pulse low
resetting the audio decoder.
SMODE
53
O
Audio data/timing information select. SMODE is low when output data on ASOUT is compressed
audio. SMODE is high when output data on ASOUT is either a (PTS) (bit 33 low) or a SCR (bit 33 high).
SMODE ties directly to the SMODE input of the TMS320AV120.
SREQ
57
I
Audio serial-data request input, active low. SREQ is the handshake signal provided by the audio
decoder that requests the ’AV220 to output more audio data. SREQ ties directly to the TMS320AV120
SREQ output.
SYSCLK
76
I
System clock, 40 MHz. The ’AV220 uses SYSCLK to clock the internal processor and the DRAM
controller. For proper operation of the ’AV220, SYSCLK must have a nominal frequency of 40 MHz.
All local DRAM accesses are synchronized to this clock. VCLK is limited to half the frequency of
SYSCLK. The use of a precision 40-MHz oscillator for SYSCLK is strongly recommended. Other
information in this data sheet regarding the performance and speed of the ’AV220 is based on a 40-MHz
SYSCLK frequency.
TEST1
TEST0
43
44
I
Test-mode select. Tie TEST1 and TEST0 low for normal operation.
UCAS
46
O
Upper-byte column-address strobe, active low. UCAS latches the column address in DRAM for the
upper memory data byte, MD15–MD8.
UCASIN
33
I
Upper data-latch enable. The ’AV220 latches data coming from the high data byte of the DRAM
(MD15–MD8) on the rising edge of UCASIN. Typically, UCASIN is connected to the DRAM CAS
terminal mechanically farthest from the ’AV220.
相關(guān)PDF資料
PDF描述
TMS320AV410 Digital NTSC/PAL Encoder(數(shù)字NTSC/PAL編碼器)
TMS320AV411 Digital NTSC/PAL Encoder(數(shù)字NTSC/PAL編碼器)
TMS320AV420 Digital NTSC Encoder(數(shù)字NTSC編碼器)
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TMS320C6455ZTZ Fixed-Point Digital Signal Processor
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TMS320AV220PCM 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Audio/Video Decoder for MPEG
TMS320AV410 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit
TMS320AV410PJM 制造商:Rochester Electronics LLC 功能描述:- Bulk
TMS320AV411 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit
TMS320AV411PJM 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:
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