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XC3S1600E-4FGG320C 参数 Datasheet PDF下载

XC3S1600E-4FGG320C图片预览
型号: XC3S1600E-4FGG320C
PDF下载: 下载PDF文件 查看货源
内容描述: 的Spartan- 3E FPGA系列 [Spartan-3E FPGA Family]
分类和应用: 现场可编程门阵列可编程逻辑时钟
文件页数/大小: 193 页 / 1733 K
品牌: XILINX [ XILINX, INC ]
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Functional Description  
block RAM’s shared connectivity with the multipliers are  
located in XAPP463.  
Block RAM  
Spartan-3E devices incorporate 4 to 36 dedicated block  
RAMs, which are organized as dual-port configurable  
18 Kbit blocks. Functionally, the block RAM is identical to  
the Spartan-3 architecture block RAM. Block RAM synchro-  
nously stores large amounts of data while distributed RAM,  
previously described, is better suited for buffering small  
amounts of data anywhere along signal paths. This section  
describes basic block RAM functions. For detailed imple-  
mentation information, refer to XAPP463: "Using Block  
RAM in Spartan-3 Series FPGAs".  
The Internal Structure of the Block RAM  
The block RAM has a dual port structure. The two identical  
data ports called A and B permit independent access to the  
common block RAM, which has a maximum capacity of  
18,432 bits, or 16,384 bits with no parity bits (see parity bits  
description in Table 19). Each port has its own dedicated  
set of data, control, and clock lines for synchronous read  
and write operations. There are four basic data paths, as  
shown in Figure 27:  
Each block RAM is configurable by setting the content’s ini-  
tial values, default signal value of the output registers, port  
aspect ratios, and write modes. Block RAM can be used in  
single-port or dual-port modes.  
1. Write to and read from Port A  
2. Write to and read from Port B  
3. Data transfer from Port A to Port B  
4. Data transfer from Port B to Port A  
Arrangement of RAM Blocks on Die  
The block RAMs are located together with the multipliers on  
the die in one or two columns depending on the size of the  
device. The XC3S100E has one column of block RAM. The  
Spartan-3E devices ranging from the XC3S250E to  
XC3S1600E have two columns of block RAM. Table 18  
shows the number of RAM blocks, the data storage capac-  
ity, and the number of columns for each device. Row(s) of  
CLBs are located above and below each block RAM col-  
umn.  
3
Write  
Read  
Read  
Write  
4
Spartan-3E  
Dual-Port  
Block RAM  
Write  
Write  
2
1
Read  
Read  
Table 18: Number of RAM Blocks by Device  
DS312-2_01_020705  
Total  
Number of  
RAM  
Total  
Addressable  
Locations  
(bits)  
Figure 27: Block RAM Data Paths  
Number  
of  
Columns  
Number of Ports  
Device  
Blocks  
A choice among primitives determines whether the block  
RAM functions as dual- or single-port memory. A name of  
the form RAMB16_S[wA]_S[wB] calls out the dual-port prim-  
itive, where the integers wA and wB specify the total data  
path width at ports A and B, respectively. Thus, a  
RAMB16_S9_S18 is a dual-port RAM with a 9-bit Port A  
and an 18-bit Port B. A name of the form RAMB16_S[w]  
identifies the single-port primitive, where the integer w  
specifies the total data path width of the lone port A. A  
RAMB16_S18 is a single-port RAM with an 18-bit port.  
XC3S100E  
XC3S250E  
XC3S500E  
XC3S1200E  
XC3S1600E  
4
73,728  
221,184  
368,640  
516,096  
663,552  
1
2
2
2
2
12  
20  
28  
36  
Immediately adjacent to each block RAM is an embedded  
18x18 hardware multiplier. The upper 16 bits of the block  
RAM's Port A Data input bus are shared with the upper 16  
bits of the A multiplicand input bus of the multiplier. Similarly,  
the upper 16 bits of Port B's data input bus are shared with  
the B multiplicand input bus of the multiplier. Details on the  
Port Aspect Ratios  
Each port of the block RAM can be configured indepen-  
dently to select a number of different possible widths for the  
data input (DI) and data output (DO) signals as shown in  
Table 19.  
DS312-2 (v1.1) March 21, 2005  
www.xilinx.com  
27  
Advance Product Specification