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DS312_09 参数 Datasheet PDF下载

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型号: DS312_09
PDF下载: 下载PDF文件 查看货源
内容描述: 的Spartan- 3E FPGA系列:介绍和订购信息 [Spartan-3E FPGA Family: Introduction and Ordering Information]
分类和应用:
文件页数/大小: 233 页 / 5527 K
品牌: XILINX [ XILINX, INC ]
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R
Functional Description  
RAM Data  
Table 25: Block RAM Function Table (Continued)  
Input Signals  
Output Signals  
DOP DO  
Write RAM, Simultaneous Read Operation  
addr pdata Data WRITE_MODE = WRITE_FIRST  
GSR EN SSR WE CLK ADDR  
DIP  
DI  
Parity  
Data  
0
1
0
1
pdata  
RAM(data)  
No Chg  
data  
RAM(addr)  
pdata  
RAM(addr)  
data  
WRITE_MODE = READ_FIRST  
RAM(data)  
RAM(addr)  
pdata  
RAM(addr)  
pdata  
WRITE_MODE = NO_CHANGE  
No Chg  
RAM(addr)  
RAM(addr)  
pdata  
pdata  
There are a number of different conditions under which data  
can be accessed at the DO outputs. Basic data access  
always occurs when the WE input is inactive. Under this  
condition, data stored in the memory location addressed by  
the ADDR lines passes through a output latch to the DO  
outputs. The timing for basic data access is shown in the  
portions of Figure 33, Figure 34, and Figure 35 during  
which WE is Low.  
Data also can be accessed on the DO outputs when assert-  
ing the WE input based on the value of the WRITE_MODE  
attribute as described in Table 26.  
Table 26: WRITE_MODE Effect on Data Output Latches During Write Operations  
Effect on Opposite Port  
(dual-port only with same address)  
Write Mode  
Effect on Same Port  
WRITE_FIRST  
Read After Write  
Data on DI and DIP inputs is written into  
specified RAM location and simultaneously  
appears on DO and DOP outputs.  
Invalidates data on DO and DOP outputs.  
READ_FIRST  
Read Before Write  
Data from specified RAM location appears on  
DO and DOP outputs.  
Data from specified RAM location appears on  
DO and DOP outputs.  
Data on DI and DIP inputs is written into  
specified location.  
NO_CHANGE  
No Read on Write  
Data on DO and DOP outputs remains  
unchanged.  
Invalidates data on DO and DOP outputs.  
Data on DI and DIP inputs is written into  
specified location.  
DS312-2 (v3.8) August 26, 2009  
www.xilinx.com  
41  
Product Specification  
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