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DPCLK0 参数 Datasheet PDF下载

DPCLK0图片预览
型号: DPCLK0
PDF下载: 下载PDF文件 查看货源
内容描述: 的Cyclone III器件手册 [Cyclone III Device Handbook]
分类和应用:
文件页数/大小: 274 页 / 7302 K
品牌: ALTERA [ ALTERA CORPORATION ]
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4–4  
Chapter 4: Embedded Multipliers in the Cyclone III Device Family  
Architecture  
Figure 4–2 shows the multiplier block architecture.  
Figure 4–2. Multiplier Block Architecture  
signa  
signb  
aclr  
clock  
ena  
D
Q
Q
Data A  
Data B  
ENA  
Data Out  
D
Q
CLRN  
ENA  
CLRN  
D
ENA  
Output  
Register  
Input  
Register  
CLRN  
Embedded Multiplier Block  
Input Registers  
You can send each multiplier input signal into an input register or directly into the  
multiplier in 9- or 18-bit sections, depending on the operational mode of the  
multiplier. Each multiplier input signal can be sent through a register independently  
of other input signals. For example, you can send the multiplier Data Asignal through  
a register and send the Data Bsignal directly to the multiplier.  
The following control signals are available to each input register in the embedded  
multiplier:  
clock  
clock enable  
asynchronous clear  
All input and output registers in a single embedded multiplier are fed by the same  
clock, clock enable, and asynchronous clear signals.  
Multiplier Stage  
The multiplier stage of an embedded multiplier block supports 9 × 9 or 18 × 18  
multipliers as well as other multipliers in between these configurations. Depending  
on the data width or operational mode of the multiplier, a single embedded multiplier  
can perform one or two multiplications in parallel. For multiplier information, refer to  
“Operational Modes” on page 4–5.  
Each multiplier operand is a unique signed or unsigned number. Two signals, signa  
and signb, control an input of a multiplier and determine if the value is signed or  
unsigned. If the signasignal is high, the Data Aoperand is a signed number. If the  
signasignal is low, the Data Aoperand is an unsigned number.  
Cyclone III Device Handbook  
Volume 1  
December 2011 Altera Corporation  
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