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參數(shù)資料
| 型號： | AD9920ABBCZRL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 78/112頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PROCESSOR CCD 12BIT 105CSPBGA |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 位數(shù)： | 12 |
| 電壓 - 電源，模擬： | 1.6 V ~ 2 V |
| 電壓 - 電源，數(shù)字： | 1.6 V ~ 2 V |
| 封裝/外殼： | 105-LFBGA，CSPBGA |
| 供應(yīng)商設(shè)備封裝： | 105-CSPBGA（8x8） |
| 包裝： | 帶卷 (TR) |
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AD9920A
Rev. B | Page 68 of 112
GP LOOKUP TABLE (LUT)
The AD9920A is equipped with a lookup table for each pair
of consecutive GP signals when configured as outputs. GPO1 is
always combined with GPO2, GPO3 is always combined with
GPO4, GPO5 is always combined with GPO6, and GPO7 is
always combined with GPO8. The external GPO outputs from
each pair can output the result of the LUT or the original GP
internal signal.
GP1
LUT
1
0
1
GPO2
GPO1
GP2
GP2_USE_LUT
GP1_USE_LUT
06
87
8-
08
8
Figure 88. Internal LUT for GPO1 and GPO2 Signals
Address 0x7B configures the behavior of the LUT and which
signals receive the result. Each 4-bit LUT_FOR_GPxy register
can realize any logic combination of GPx and GPy. For example,
Table 46 shows how the register values of LUT_FOR_GP12,
Bits[11:8], are determined. XOR, NAND, AND, and OR results
are shown, but any 4-bit combination is possible. A simple
example of XOR gating is shown in Figure 89.
Table 46. LUT Results Based on GP1 and GP2 Values
GP2
GP1
LUT: XOR
LUT: NAND
LUT: AND
LUT: OR
0
1
0
1
0
1
0
1
0
1
0
1
GP1
GP2
GPO2
NOTES
1. LOGIC COMBINATION (XOR) OF PROGRAMMED TOGGLES
GP1 AND GP2.
LUT_FOR_GP12[11:8] = 0x06
GP2_USE_LUT = 1
GP1_USE_LUT = 0
GPO1
06
87
8-
08
9
Figure 89. LUT Example for GP1 XOR GP2
Field Counter and GPO Limitations
The following is a summary of the known limitations of the
field counters and GPO signals.
The field counter trigger (PRIMARY_ACTION and
SECOND_ACTION registers, Address 0x70) is
automatically reset at the start of every VD period.
Therefore, there must be one VD period between
sequential programming to that address.
If GPx_PROTOCOL = 1, it must be manually reset to
GPx_PROTOCOL = 0 one VD period before it can be
used again. If manual toggles are desired in sequential
fields, the MANUAL_TRIG register should be used in
conjunction with GPx_PROTOCOL = 1.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AD9920BBCZ | 制造商:Analog Devices 功能描述: |
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