参数资料
型号: QL8150-6PT280I
厂商: QUICKLOGIC CORP
元件分类: FPGA
英文描述: FPGA, 640 CLBS, 188946 GATES, PBGA280
封装: 0.80 MM PITCH, LFBGA-280
文件页数: 89/96页
文件大小: 1607K
代理商: QL8150-6PT280I
2007 QuickLogic Corporation
Eclipse II Family Data Sheet Rev. Q
9
PLL Signals
Table 7 summarizes the key signals in QuickLogic PLLs.
NOTE: Because PLLCLK_IN and PLL_RESET signals have PLL_INPAD, and PLLPAD_OUT has OUTPAD,
you do not need to add additional pads to your design.
I/O Cell Structure
Eclipse II features a variety of distinct I/O pins to maximize performance, functionality, and flexibility with bi-
directional I/O pins and input-only pins. All input and I/O pins are 1.8 V, 2.5 V, and 3.3 V tolerant and comply
with the specific I/O standard selected. For single ended I/O standards, VCCIO specifies the input tolerance
and the output drive. For voltage referenced I/O standards (e.g SSTL), the voltage supplied to the INREF pins
in each bank specifies the input switch point. For example, the VCCIO pins must be tied to a 3.3 V supply to
provide 3.3 V compliance. Eclipse II can also support the LVDS and LVPECL I/O standards with the use of
external resistors (see Table 8).
As designs become more complex and requirements more stringent, several application-specific I/O standards
have emerged for specific applications. I/O standards for processors, memories, and a variety of bus
applications have become commonplace and a requirement for many systems. In addition, I/O timing has
Table 7: QuickLogic PLL Signals
Signal Name
Description
PLLCLK_IN
Input clock signal.
PLL_RESET
Active High Reset If PLL_RESET is asserted, then CLKNET_OUT and PLLPAD_OUT are reset
to 0. This signal must be asserted and then released in order for the LOCK_DETECT to work.
ONn_OFFCHIP
This is a reserved signal. It can be connected to VCC or GND.
CLKNET_OUT
Out to internal gates This signal bypasses the PLL logic before driving the clock tree. Note that
this signal cannot be used in the same quadrant where the PLL signal is used (PLLCLK_OUT).
PLLCLK_OUT
Out from PLL to internal gates This signal can drive the clock tree after going through the PLL.
PLLPAD_OUT
Out to off-chip This outgoing signal is used off-chip. The PLLPAD_OUT is always active, driving
the PLL-derived clock signal out through the pad. The PLLPAD_OUT will not oscillate if
PLL_RESET is asserted, or if the PLL is powered down.
LOCK_DETECT
Active High Lock detection signal
NOTE: For simulation purposes, this signal gets asserted after 10 clock cycles. However, it can take
a maximum of 200 clock cycles to sync with the input clock upon release of the PLL_RESET signal.
Table 8: I/O Standards and Applications
I/O Standard
Reference Voltage
Output Voltage
Application
LVTTL
n/a
3.3 V
General Purpose
LVCMOS25
n/a
2.5 V
General Purpose
LVCMOS18
n/a
1.8 V
General Purpose
PCI
n/a
3.3 V
PCI Bus Applications
GTL+
1
n/a
Backplane
SSTL3
1.5
3.3 V
SDRAM
SSTL2
1.25
2.5 V
SDRAM
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