参数资料
型号: LFXP15C-4FN256C
厂商: LATTICE SEMICONDUCTOR CORP
元件分类: FPGA
中文描述: FPGA, 1932 CLBS, PBGA256
封装: 17 X 17 MM, LEAD FREE, FPBGA-256
文件页数: 39/130页
文件大小: 1312K
代理商: LFXP15C-4FN256C
2-13
Architecture
Lattice Semiconductor
LatticeXP Family Data Sheet
Figure 2-14. sysMEM Memory Primitives
The EBR memory supports three forms of write behavior for single port or dual port operation:
1.
Normal – data on the output appears only during read cycle. During a write cycle, the data (at the current
address) does not appear on the output. This mode is supported for all data widths.
2.
Write Through -a copy of the input data appears at the output of the same port during a write cycle.This
mode is supported for all data widths.
3.
Read-Before-Write – when new data is being written, the old content of the address appears at the output.
This mode is supported for x9, x18 and x36 data widths.
Memory Core Reset
The memory array in the EBR utilizes latches at the A and B output ports. These latches can be reset asynchro-
nously. RSTA and RSTB are local signals, which reset the output latches associated with Port A and Port B respec-
tively. The Global Reset (GSRN) signal resets both ports. The output data latches and associated resets for both
ports are as shown in Figure 2-15.
EBR
AD[12:0]
DI[35:0]
CLK
CE
RST
WE
CS[2:0]
DO[35:0]
Single Port RAM
EBR
True Dual Port RAM
Pseudo-Dual Port RAM
ROM
AD[12:0]
CLK
CE
DO[35:0]
RST
CS[2:0]
EBR
ADA[12:0]
DIA[17:0]
CLKA
CEA
RSTA
WEA
CSA[2:0]
DOA[17:0]
ADB[12:0]
DIB[17:0]
CLKB
CEB
RSTB
WEB
CSB[2:0]
DOB[17:0]
ADW[12:0]
DI[35:0]
CLKW
CEW
ADR[12:0]
DO[35:0]
CER
CLKR
WE
RST
CS[2:0]
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