参数资料
型号: AD9992BBCZRL
厂商: Analog Devices Inc
文件页数: 51/92页
文件大小: 0K
描述: IC CCD SGNL PROC 12BIT 105CSPBGA
产品变化通告: AD9992 Discontinuation 22/Feb/2012
标准包装: 2,000
类型: CCD 信号处理器,12 位
输入类型: 逻辑
输出类型: 逻辑
接口: 3 线串口
电流 - 电源: 27mA
安装类型: 表面贴装
封装/外壳: 105-LFBGA,CSPBGA
供应商设备封装: 105-CSPBGA(8x8)
包装: 带卷 (TR)
AD9992
Rev. C | Page 55 of 92
GP LOOK-UP TABLES (LUT)
The AD9992 is equipped with a look-up table for each pair of
consecutive GP signals when configured as outputs. GP1 is
always combined with GP2, GP3 is always combined with GP4,
GP5 is always combined with GP6, and GP7 is always combined
with GP8. 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
05
89
1-
06
4
Figure 63. Internal LUT for GP1 and GP2 Signals
Address 0x79 dictates 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 24 shows how the register values of LUT_FOR_GP12 [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 64.
Table 24. 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
0
589
1-
0
65
Figure 64. 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 that dictate usability:
The field counter trigger (PRIMARY_ACTION and
SECONDARY_ACTION registers, Address 0x70) is self-reset
at the start of every VD period. Therefore, there must be one
VD period between sequential programming to that address.
If GP*_PROTOCOL = 1, it must be manually reset to
GP*_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
GP*_PROTOCOL = 1.
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