DS3104数据手册集成电路（IC）的应用特定时钟/定时规格书PDF

描述 Description

The DS3104-SE is a low-cost, feature-rich timing IC for line cards with Synchronous Gigabit Ethernet (GbE), 10-Gigabit Ethernet (10GbE), and Fast Ethernet ports. ITU-T recommendation G.8261 specifies that network synchronization can be carried over packet links by synchronizing the bit clock of the physical layer as is currently done on SONET/SDH links. The DS3104 enables synchronization in Ethernet line cards in both the transmit and receive directions.

In the transmit direction, the device accepts traditional SONET/SDH system clocks such as 19.44MHz from redundant system timing cards and synthesizes frequency-locked xMII clock rates, such as the 125MHz GTX_CLK for GbE GMIIs. Each Ethernet PHY then synthesizes a transmit bit clock that is frequency-locked to the xMII clock, and thus to the system clock and network clock. In the receive direction, each PHY divides down the recovered bit clock to produce the receive xMII clock. The DS3104 accepts the xMII clock from any of several Ethernet ports and forwards a frequency-locked system clock, such as 19.44MHz, to the system timing cards. SONET/SDH ports are also supported.

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特性 Features

Timing Card to Line Card Path
• Two Input Clocks from Master and Slave Timing Cards (LVDS/LVPECL or CMOS/TTL)
• Optional Frame-Sync Inputs and Outputs
• Continuous Input Clock Quality Monitoring
• Hitless Reference Switching, Automatic or Manual
• Holdover on Loss of All Inputs
• Programmable PLL Bandwidth, 0.1Hz to 400Hz
• Frequency Conversion Between SONET/SDH Rates and Ethernet MII/GMII/XGMII Rates
• Up to 7 Output Clocks: 3 CMOS/TTL (≤ 125MHz), 2 LVDS/LVPECL (≤ 312.50MHz), and 2 Dual CMOS/TTL and LVDS/LVPECL
Line Card to Timing Card Path
• Up to 8 Input Clocks: 4 CMOS/TTL (≤ 125MHz) and 4 LVDS/LVPECL/CMOS/TTL (≤ 156.25MHz)
• Hitless Reference Switching, Automatic or Manual
• Frequency Conversion Between Ethernet MII/GMII/XGMII and SONET/SDH Rates
• Two Output Clocks to Master and Slave Timing Cards (CMOS/TTL or LVDS/LVPECL)
General
• Suitable Line Card IC for Stratum 3/3E/4, SMC, SEC
• Numerous Input Clock Frequencies Supported below:
• Ethernet xMII: 2.5, 25, 125, 156.25MHz
• SONET/SDH: 6.48, N x 19.44, N x 51.84MHz
• PDH: N x DS1, N x E1, N x DS2, DS3, E3
• Frame Sync: 2kHz, 4kHz, 8kHz
• Custom: Any Multiple of 2kHz Up to 131.072MHz, Any Multiple of 8kHz Up to 155.52MHz
• Numerous Output Clock Frequencies Supported below:
• Ethernet xMII: 2.5, 25, 125, 156.25, 312.5MHz
• SONET/SDH: 6.48, N x 19.44, N x 51.84MHz
• PDH: N x DS1, N x E1, N x DS2, DS3, E3
• Other: 10, 10.24, 13, 30.72MHz
• Frame Sync: 2kHz, 8kHz
• Custom Clock Rates: Any Multiple of 2kHz Up to 77.76MHz, Any Multiple of 8kHz Up to 311.04MHz, Any Multiple of 10kHz Up to 388.79MHz
Internal Compensation for Master Clock Oscillator
SPI™ Processor Interface
1.8V Operation with 2.5V/3.3V I/O (5V Tolerant)
Applications/Uses
• Line Cards with Any Mix of Synchronous Ethernet and SONET/SDH Ports in WAN Equipment Including MSPPs, Ethernet Switches, Routers, DSLAMs, and Wireless Base Stations

简介

DS3104属于集成电路（IC）的应用特定时钟/定时。由制造生产的DS3104应用特定时钟/定时专用时钟和计时 IC（集成电路）产品族中的产品主要用于执行与时间或频率信息生成和分配相关的各种操作，适合的设计环境较特定，例如 AMD 和 Intel 的中央处理单元 (CPU) 或图形处理单元 (GPU)、DVD 音频设备、蓝光光盘播放器、以太网设备、PCIe、SATA、光纤通道接口、车载娱乐总线等。