參數(shù)資料
型號(hào): XC3S1000
廠商: Xilinx, Inc.
英文描述: Spartan-3 FPGA Family: Complete Data Sheet
中文描述: 的Spartan - 3 FPGA系列:完整的數(shù)據(jù)手冊(cè)
文件頁(yè)數(shù): 21/198頁(yè)
文件大?。?/td> 1605K
代理商: XC3S1000
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Spartan-3 FPGA Family: Functional Description
14
www.xilinx.com
DS099-2 (v1.3) August 24, 2004
Preliminary Product Specification
40
R
Figure 8:
Block RAM Primitives
DS099-2_13_082104
WEA
ENA
SSRA
CLKA
ADDRA[r
A
–1:0]
DIA[w
A
–1:0]
DIPA[3:0]
DOPA[p
A
–1:0]
DOA[w
A
–1:0]
RAM16_w
A
_w
B
(a) Dual-Port
(b) Single-Port
DOPB[p
B
–1:0]
DOB[w
B
–1:0]
WEB
ENB
SSRB
CLKB
ADDRB[r
B
–1:0]
DIB[w
B
–1:0]
DIPB[3:0]
WE
EN
SSR
CLK
ADDR[r–1:0]
DI[w–1:0]
DIP[p–1:0]
DOP[p–1:0]
DO[w–1:0]
RAM16_Sw
Notes:
1.
2.
3.
4.
w
A
and w
B
are integers representing the total data path width (i.e., data bits plus parity bits) at ports A and B, respectively.
p
A
and p
B
are integers that indicate the number of data path lines serving as parity bits.
r
A
and r
B
are integers representing the address bus width at ports A and B, respectively.
The control signals CLK, WE, EN, and SSR on both ports have the option of inverted polarity.
Table 9:
Block RAM Port Signals
Signal
Description
Port A
Signal
Name
Port B
Signal
Name
Direction
Function
Address Bus
ADDRA
ADDRB
Input
The Address Bus selects a memory location for read or write
operations. The width (w) of the port’s associated data path
determines the number of available address lines (r).
Data Input Bus
DIA
DIB
Input
Data at the DI input bus is written to the addressed memory
location addressed on an enabled active CLK edge.
It is possible to configure a port’s total data path width (w) to be
1, 2, 4, 9, 18, or 36 bits. This selection applies to both the DI and
DO paths of a given port. Each port is independent. For a port
assigned a width (w), the number of addressable locations will
be 16,384/(w-p) where "p" is the number of parity bits. Each
memory location will have a width of "w" (including parity bits).
See the DIP signal description for more information of parity.
Parity Data
Input(s)
DIPA
DIPB
Input
Parity inputs represent additional bits included in the data input
path to support error detection. The number of parity bits "p"
included in the DI (same as for the DO bus) depends on a port’s
total data path width (w). See
Table 10
.
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