器件名称: W199
功能描述: Spread Spectrum FTG for VIA Apollo Pro-133
文件大小: 154.42KB 共14页
简 介:PRELIMINARY
W199
Spread Spectrum FTG for VIA Apollo Pro-133
Features
Maximized EMI suppression using Cypress’s Spread Spectrum Technology Single-chip system frequency synthesizer for VIA Apollo Pro-133 Two copies of CPU output Six copies of PCI output One 48-MHz output for USB One 24-MHz output for SIO Two buffered reference outputs One IOAPIC output 13 SDRAM outputs provide support for 3 DIMMs Supports frequencies up to 150 MHz I2C interface for programming Power management control inputs Available in 48-pin SSOP Table 1. Mode Input Table Mode 0 1 Table 2. Pin Selectable Frequency Input Address FS3 1 1 1 1 1 1 1 1 0 CPU Cycle-to-Cycle Jitter: ......................................... 250 ps CPU to CPU Output Skew: ........................................ 175 ps PCI to PCI Output Skew: ............................................ 500 ps VDDQ3: .................................................................... 3.3V±5% VDDQ2: .................................................................... 2.5V±5% SDRAMIN to SDRAM0:11 Delay: ..........................3.7 ns typ. SDRAM0:11 (leads) to SDRAM_F Skew: ..............0.4 ns typ. 0 0 0 0 0 0 0 FS2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 FS1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0
[1]
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 VDDQ2 IOAPIC REF1/FS2* GND CPU_F CPU1 VDDQ2 CLK_STOP# SDRAM_F GND SDRAM0 SDRAM1 VDDQ3 SDRAM2 SDRAM3 GND SDRAM4 SDRAM5 VDDQ3 SDRAM6 SDRAM7 VDDQ3 48MHz/FS0* 24MHz/FS1*
Pin 2 PCI_ST……
