Lattice 公司的ispClock 5400D是用于時(shí)鐘分配的在系統(tǒng)可編程的超低抖動(dòng)的零延遲通用扇出的緩沖器,集成了超低抖動(dòng)時(shí)鐘源CleanClock PLL和FlexiClock 輸出區(qū)塊,可編程差分輸出標(biāo)準(zhǔn),單個(gè)使能控制:LVDS, LVPECL, HSTL, SSTL, HCSL, MLVDS.主要用在SERDES的低成本時(shí)鐘源,ATCA, MicroTCA, AMC, PCI Express以及差分時(shí)鐘分配等.本文介紹了ispClock 5400D系列主要特性,功能方框圖,以及ispClock5400D評(píng)估板主要特性,電路圖和材料清單(BOM).
ispClock 5400D Family In-System Programmable, Ultra-Low Jitter Zero Delay and Fan-Out Buffer,Differential
The ispClock5400D family integrates a CleanClock PLL and a FlexiClock Output block. The CleanClock PLL pro-vides an ultra-low-jitter clock source to a set of four V-dividers. The FlexiClock output block receives the clock out-put from these V-dividers through an output switch matrix and distributes them to the output pin using a programmable logic interface. There are two members in the ispClock5400D family, the ispClock5410D (10-output FlexiCLock block) and the ispClock5406D (6-output FlexiClock block). Each of the outputs may be independently configured to support separate I/O standards (LVDS, LVPECL, SSTL, HSTL, MLVDS, HCSL) and output frequency. In addition, the skew of each of the outputs can be independently controlled. All configuration information is stored on-chip in non-volatile E2CMOS® memory. The ispClock5400D devices provide extremely low propagation delay (zero-delay) from input to output using the CleanClock PLL. The PLL VCO output clock frequency is divided down by a set of four V- dividers. The output fre-quencies from these V-dividers, fVCO ÷ 2, fVCO ÷ 4, fVCO ÷ 8 and fVCO ÷ 16 are connected to the output routing matrix. The output routing matrix enables any output pin to derive its clock from any of the V-dividers outputs. Addi-tionally, the reference input clock can be connected directly to any output through the output routing matrix. The FlexiClock block supports dual skew mechanisms: Phase Skew Control and Time Skew Control. These skew control mechanisms enable fixed output clock skew control during power-up and variable skew during operation. The ispClock5400D device can be configured to operate in four modes: zero delay buffer mode, dual non-zero delay buffer mode, non-zero delay buffer mode with output dividers, and combined zero-delay and non-zero delay buffer mode. The I2C interface can be used to dynamically control the ispClock5400D configuration: Output clock frequency, Phase Skew, Time skew, Fan-out buffer mode, Output enable. The core functions of both members of the ispClock5400D family are identical.
ispClock 5400D主要特性:
CleanClock™ PLL
FlexiClock™ I/O
? Ultra Low Period Jitter 2.5ps
? Ultra Low Phase Jitter 6.5ps
? Fully Integrated High-Performance PLL
•Programmable lock detect
•Four output dividers
•Programmable on-chip loop filter
•Compatible with Spread Spectrum clocks
•Internal/external feedback
? Flexible Clock Reference and External Feedback Inputs
•Programmable differential input reference/feed-back standards - LVDS, LVPECL, HSTL, SSTL, HCSL, MLVDS
•Programmable termination
•Clock A/B selection multiplexer
? 40 MHz to 400 MHz Input/Output Operation
? Dual Programmable Skew Per Output
•Programmable phase adjustment - 16 settings; minimum step size 156 ps-Up to +/- 9.4 ns skew range- Coarse and fine adjustment modes
•Programmable time delay adjustment - 16 settings; 18 ps
? Dynamic Skew Control Through I2C
? Low Output-to-Output Skew (<100ps)
? Up to 10 Programmable Fan-out Buffers
•Programmable differential output standards and individual enable controls - LVDS, LVPECL, HSTL, SSTL, HCSL, MLVDS
•Up to 10 banks with individual VCCO and GND - 1.5V, 1.8V, 2.5V, 3.3V
? All I/Os are Hot Socket Compliant
? Operating Modes
•Fan-out buffer with programmable output skew control
•Zero delay buffer with dual programmable skew controls
? Dynamic Reconfiguration through I2C
? Full JTAG Boundary Scan Test In-System Programming Support
? Exceptional Power Supply Noise Immunity
? Commercial (0°to 70℃) and Industrial (-40°to 85℃) Temperature Ranges 48-Pin and 64-pin QFNS Packages
ispClock 5400D應(yīng)用:
•Low-cost clock source for SERDES
•ATCA, MicroTCA, AMC, PCI Express
•Differential Clock Distribution
•Generic Source Synchronous Clock Management
•Zero-delay clock buffer
圖1.ispClock 5400D方框圖
圖2.ispClock5410D 功能方框圖
圖3.ispClock5406D功能方框圖
ispClock5400D評(píng)估板
This board features an ispClock5406D device that provides in-system-programmable zero delay universal fan-out buffers for use in clock distribution applications. The on-board ispClock5406D is a 6-output clock distribution IC. Differential ultra low skew outputs are organized with two banks per group. Each bank may be independently con-figured to support separate I/O standards (LVDS, LVPECL, HSTL, SSTL, HCSL, and MLVDS) and output fre-quency. In addition, each output provides independent programmable control of phase and time skew. All configuration information is stored on-chip in non-volatile E2CMOS® memory.
ispClock5400D評(píng)估板主要特性:
The ispClock5400D Evaluation Board package includes:
• ispClock5400D Evaluation Board
– The board features the following on
-board components and circuits: ispClock5406D programmable clock (ispPAC-CLK5406D-01SN48I)
– Crystal oscillator circuits
– Can oscillator circuit landing
– Resistor networks
– SMA connectors
– Power jack
Test and JTAG interface headers
• Pre-loaded Base Demo – The kit includes a pre-loaded demo design that highlights key performance character-istics of the ispClock5406D device.
• Lattice ispDOWNLOAD™ Cable (HW-USBN-2A)– The ispDOWNLOAD cable provides a hardware connection for in-system programming of the ispClock5406D device.
• User’s Guide – Provides information on powering, connecting lab equipment, and using the board as a clock source for various Lattice FPGA evaluation boards. The contents of this user’s guide include demo operation, top-level functional descriptions of the various portions of the evaluation board, descriptions of the on-board con-nectors, switches and a complete set of schematics.
• QuickSTART Guide – Provides information on connecting the evaluation board, running the pre-loaded evalua-tion demo.
圖4.ispClock5400D評(píng)估板外形圖
圖5.ispClock5400D評(píng)估板電路圖(1)
圖6.ispClock5400D評(píng)估板電路圖(2)
圖7.ispClock5400D評(píng)估板電路圖(3)
圖8.ispClock5400D評(píng)估板電路圖(4)
圖9.ispClock5400D評(píng)估板電路圖(5)
圖10.ispClock5400D評(píng)估板電路圖(6)
圖11.ispClock5400D評(píng)估板電路圖(7)
圖12.ispClock5400D評(píng)估板電路圖(8)
圖13.ispClock5400D評(píng)估板電路圖(9)
ispClock5400D評(píng)估板材料清單(BOM):
詳情請(qǐng)見(jiàn):
http://www.latticesemi.com/documents/DS1025.pdf?jsessionid=f030912b1e4f2710c9707b3c5c122a422b25
