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参数资料
型号： LFEC20E-5FN484C
厂商： Lattice Semiconductor Corporation
文件页数： 91/163页
文件大小： 0K
描述： IC FPGA 19.7KLUTS 360I/O 484-BGA
标准包装： 60
系列： EC
逻辑元件/单元数： 19700
RAM 位总计： 434176
输入/输出数： 360
电源电压： 1.14 V ~ 1.26 V
安装类型： 表面贴装
工作温度： 0°C ~ 85°C
封装/外壳： 484-BBGA
供应商设备封装： 484-FPBGA（23x23）
2-30
Architecture
LatticeECP/EC Family Data Sheet
Typical I/O Behavior During Power-up
The internal power-on-reset (POR) signal is deactivated when VCC and VCCAUX have reached satisfactory levels.
After the POR signal is deactivated, the FPGA core logic becomes active. It is the user’s responsibility to ensure
that all other VCCIO banks are active with valid input logic levels to properly control the output logic states of all the
I/O banks that are critical to the application. For more information about controlling the output logic state with valid
input logic levels during power-up in LatticeECP/EC devices, see the list of technical documentation at the end of
this data sheet.
The VCC and VCCAUX supply the power to the FPGA core fabric, whereas the VCCIO supplies power to the I/O buf-
fers. In order to simplify system design while providing consistent and predictable I/O behavior, it is recommended
that the I/O buffers be powered-up prior to the FPGA core fabric. VCCIO supplies should be powered-up before or
together with the VCC and VCCAUX supplies.
Supported Standards
The LatticeECP/EC sysI/O buffer supports both single-ended and differential standards. Single-ended standards
can be further subdivided into LVCMOS, LVTTL and other standards. The buffers support the LVTTL, LVCMOS 1.2,
1.5, 1.8, 2.5 and 3.3V standards. In the LVCMOS and LVTTL modes, the buffer has individually configurable
options for drive strength, bus maintenance (weak pull-up, weak pull-down, or a bus-keeper latch) and open drain.
Other single-ended standards supported include SSTL and HSTL. Differential standards supported include LVDS,
BLVDS, LVPECL, RSDS, differential SSTL and differential HSTL. Tables 2-13 and 2-14 show the I/O standards
(together with their supply and reference voltages) supported by the LatticeECP/EC devices. For further informa-
tion about utilizing the sysI/O buffer to support a variety of standards please see the the list of technical information
at the end of this data sheet.
Table 2-13. Supported Input Standards
Input Standard
VREF (Nom.)
VCCIO
1 (Nom.)
Single Ended Interfaces
LVTTL
—
LVCMOS33
2
——
LVCMOS25
2
——
LVCMOS18
—
1.8
LVCMOS15
—
1.5
LVCMOS12
2
——
PCI
—
3.3
HSTL18 Class I, II
0.9
—
HSTL18 Class III
1.08
—
HSTL15 Class I
0.75
—
HSTL15 Class III
0.9
—
SSTL3 Class I, II
1.5
—
SSTL2 Class I, II
1.25
—
SSTL18 Class I
0.9
—
Differential Interfaces
Differential SSTL18 Class I
—
Differential SSTL2 Class I, II
—
Differential SSTL3 Class I, II
—
Differential HSTL15 Class I, III
—
Differential HSTL18 Class I, II, III
—
LVDS, LVPECL, BLVDS, RSDS
—
1. When not specified VCCIO can be set anywhere in the valid operating range.
2. JTAG inputs do not have a fixed threshold option and always follow VCCJ.
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