参数资料
型号: XCV405E-7BG560C
厂商: Xilinx Inc
文件页数: 41/118页
文件大小: 0K
描述: IC FPGA 1.8V C-TEMP 560-MBGA
产品变化通告: FPGA Family Discontinuation 18/Apr/2011
标准包装: 1
系列: Virtex®-E EM
LAB/CLB数: 2400
逻辑元件/单元数: 10800
RAM 位总计: 573440
输入/输出数: 404
门数: 129600
电源电压: 1.71 V ~ 1.89 V
安装类型: 表面贴装
工作温度: 0°C ~ 85°C
封装/外壳: 560-LBGA,金属
供应商设备封装: 560-MBGA(42.5x42.5)
Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays
DS025-2 (v3.0) March 21, 2014
Module 2 of 4
25
R
— OBSOLETE — OBSOLETE — OBSOLETE — OBSOLETE —
Operating Modes
Virtex-E block SelectRAM+ memory supports two operating
modes.
Read Through
Write Back
Read Through (one clock edge)
The read address is registered on the read port clock edge
and data appears on the output after the RAM access time.
Some memories might place the latch/register at the out-
puts, depending on the desire to have a faster clock-to-out
versus set-up time. This is generally considered to be an
inferior solution, since it changes the read operation to an
asynchronous function with the possibility of missing an
address/control line transition during the generation of the read
pulse clock.
Write Back (one clock edge)
The write address is registered on the write port clock edge
and the data input is written to the memory and mirrored on
the output.
Block SelectRAM+ Characteristics
1.
All inputs are registered with the port clock and have a
set-up to clock timing specification.
2.
All outputs have a read through or write back function
depending on the state of the port WE pin. The outputs
relative to the port clock are available after the
clock-to-out timing specification.
3.
The block SelectRAM elements are true SRAM
memories and do not have a combinatorial path from
the address to the output. The LUT SelectRAM+ cells in
the CLBs are still available with this function.
4.
The ports are completely independent from each other
(i.e., clocking, control, address, read/write function, and
data width) without arbitration.
5.
A write operation requires only one clock edge.
6.
A read operation requires only one clock edge.
The output ports are latched with a self-timed circuit to guar-
antee a glitch-free read. The state of the output port does
not change until the port executes another read or write
operation.
Library Primitives
Figure 31 and Figure 32 show the two generic library block
SelectRAM+ primitives. Table 14 describes all of the avail-
able primitives for synthesis and simulation.
Figure 31: Dual-Port Block SelectRAM+ Memory
Figure 32: Single-Port Block SelectRAM+ Memory
Table 14:
Available Library Primitives
Primitive
Port A Width
Port B Width
RAMB4_S1
RAMB4_S1_S1
RAMB4_S1_S2
RAMB4_S1_S4
RAMB4_S1_S8
RAMB4_S1_S16
1N/A
1
2
4
8
16
RAMB4_S2
RAMB4_S2_S2
RAMB4_S2_S4
RAMB4_S2_S8
RAMB4_S2_S16
2N/A
2
4
8
16
RAMB4_S4
RAMB4_S4_S4
RAMB4_S4_S8
RAMB4_S4_S16
4N/A
4
8
16
RAMB4_S8
RAMB4_S8_S8
RAMB4_S8_S16
8N/A
8
16
RAMB4_S16
RAMB4_S16_S16
16
N/A
16
WEB
ENB
RSTB
CLKB
ADDRB[#:0]
DIB[#:0]
WEA
ENA
RSTA
CLKA
ADDRA[#:0]
DIA[#:0]
DOA[#:0]
DOB[#:0]
RAMB4_S#_S#
ds022_032_121399
ds022_033_121399
DO[#:0]
WE
EN
RST
CLK
ADDR[#:0]
DI[#:0]
RAMB4_S#
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