參數(shù)資料
型號(hào): ADV212BBCZ-115
廠商: ANALOG DEVICES INC
元件分類: 消費(fèi)家電
英文描述: JPEG 2000 Video Codec
中文描述: SPECIALTY CONSUMER CIRCUIT, PBGA121
封裝: 12 X 12 MM, LEAD FREE, MO-192ABD-1, CSPBGA-121
文件頁數(shù): 30/44頁
文件大?。?/td> 374K
代理商: ADV212BBCZ-115
ADV212
PLL
The ADV212 uses the PLL_HI and PLL_LO direct registers to
configure the PLL. Any time the PLL_LO register is modified,
the host must wait at least 20 μs before reading from or writing
to another register. If this delay is not implemented, erratic
behavior might result.
MCLK is the input clock to the ADV212 PLL and is used to
generate the internal JCLK (JPEG 2000 processor clock) and
HCLK (embedded CPU clock).
The PLL can be programmed to have any possible final
multiplier value as long as
JCLK > 50 MHz and < 150 MHz (144-pin version).
JCLK > 50 MHz and < 115 MHz (121-pin version).
HCLK < 81 MHz (121-pin version), or HCLK < 108 MHz
(144-pin version).
JCLK ≥ 2 × VCLK for single-component input.
JCLK ≥ 2 × VCLK for YCbCr [4:2:2] input.
In JDATA mode (JDATA), JCLK must be 4 × MCLK
or higher.
The maximum burst frequency for external DMA modes is
≤ 0.36 JCLK.
Rev. 0 | Page 30 of 44
For MCLK frequencies greater than 50 MHz, the input clock
divider must be enabled, that is, IPD must be set to 1.
IPD cannot be enabled for MCLK frequencies below 20 MHz.
Deinterlace modes require JCLK ≥ 4 × MCLK.
It is not recommended to use an LLC output from a video
decoder as a clock source for MCLK.
To achieve the lowest power consumption, an MCLK frequency
of 27 MHz is recommended for a standard definition CCIR 656
input. The PLL circuit is recommended to have a multiplier of 3.
This sets JCLK and HCLK to 81 MHz.
LPF
PHASE
DETECT
VCO
JCLK
HCLK
÷2
HCLKD
÷PLLMULT
÷2
LFB
÷2
÷2
÷2
IPD
BYPASS
MCLK
0
Figure 32. PLL Architecture and Control Functions
Table 20. Recommended PLL Register Settings
IPD
LFB
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
PLLMULT
N
N
N
N
N
N
N
N
HCLKD
0
1
0
1
0
1
0
1
HCLK
N × MCLK
N × MCLK/2
2 × N × MCLK
N × MCLK
N × MCLK/2
N × MCLK/4
N × MCLK
N × MCLK/2
JCLK
N × MCLK
N × MCLK
2 × N × MCLK
2 × N × MCLK
N × MCLK/2
N × MCLK/2
N × MCLK
N × MCLK
Table 21. Recommended Values for PLL_HI and PLL_LO Registers
Video Standard
SMPTE 125M or ITU-R BT.656 (NTSC or PAL)
SMPTE 293M (525p)
ITU-R BT.1358 (625p)
SMPTE 274M (1080i)
CLKIN Frequency on MCLK
27 MHz
27 MHz
27 MHz
74.25 MHz
PLL_HI
0x0008
0x0008
0x0008
0x0008
PLL_LO
0x0004
0x0004
0x0004
0x0084
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ADV212XBCZ-150 制造商:Analog Devices 功能描述:JPEG2000 VIDEO CODEC - Bulk