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| 型号： | MSC8144ADS |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 31/80页 |
| 文件大小： | 0K |
| 描述： | ADS FOR MSC8144 DEVICE |
| 标准包装： | 1 |
| 类型： | DSP |
| 适用于相关产品： | MSC8144 |
| 所含物品： | AMC 卡、电源、缆线、USB TAP、硬件和说明文档 |
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Electrical Characteristics
2.5.2
Serial RapidIO DC Electrical Characteristics
DC receiver logic levels are not defined since the receiver is AC-coupled.
2.5.2.1
DC Requirements for SerDes Reference Clocks
The SerDes reference clocks SRIO_REF_CLK and SRIO_REF_CLK are AC-coupled differential inputs. Each differential
clock input has an internal 50 Ω termination to GND SXC . The reference clock must be able to drive this termination. The
recommended minimum operating voltage is –0.4 V; the recommended maximum operating voltage is 1.32 V; and the
maximum absolute voltage is 1.72 V.
The maximum average current allowed in each input is 8 mA. This current limitation sets the maximum common mode input
voltage to be less than 0.4 V (0.4 V/50 Ω = 8 mA) while the minimum common mode input level is GND SXC . For example, a
clock with a 50/50 duty cycle can be driven by a current source output that ranges from 0 mA to 16 mA (0–0.8 V). The input is
AC-coupled internally, so, therefore, the exact common mode input voltage is not critical.
Note:
This internal AC-couple network does not function correctly with reference clock frequencies below 90 MHz.
If the device driving the SRIO_REF_CLK inputs cannot drive 50 Ω to GND SXC , or if it exceeds the maximum input current
limitations, then it must use external AC-coupling. The minimum differential peak-to-peak amplitude of the input clock is 0.4 V
(0.2 V peak-to-peak per phase). The maximum differential peak-to-peak amplitude of the input clock is 1.6 V peak-to-peak (see
Figure 5 . The termination to GND SXC allows compatibility with HCSL type reference clocks specified for PCI-Express
applications. Many other low voltage differential type outputs can be used but will probably need to be AC-coupled due to the
limited common mode input range. LVPECL outputs can produce too large an amplitude and may need to be source terminated
with a divider network to reduce the amplitude. The amplitude of the clock must be at least a 400 mV differential peak-peak for
single-ended clock. If driven differentially, each signal wire needs to drive 100 mV around common mode voltage. The
differential reference clock (SRIO_REF_CLK/ SRIO_REF_CLK) input is HCSL-compatible DC coupled or LVDS-compatible
with AC-coupling.
SRIO_REF_CLK
50 Ω
GND SXC
50 Ω
SRIO_REF_CLK
Figure 5. SerDes Reference Clocks Input Stage
MSC8144 Quad Core Digital Signal Processor Data Sheet, Rev. 16
Freescale Semiconductor
31
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相关代理商/技术参数 |
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| MSC8144AMC-SA | 制造商:Freescale Semiconductor 功能描述:BOARD AMC SGL WIDTH MSC8144 DSP |
| MSC8144E | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Quad Core Digital Signal Processor |
| MSC8144EC | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Quad Core Digital Signal Processor |
| MSC8144ESVT1000B | 制造商:Freescale Semiconductor 功能描述:DSP 32-BIT 1GHZ 1000MIPS 783-PIN FCBGA BOX - Trays 制造商:Freescale Semiconductor 功能描述:ENCRYPTION PACSUN R2.1 783FCPBGA |
| MSC8144ESVT800A | 制造商:Freescale Semiconductor 功能描述:DSP 32BIT 800MHZ 800MIPS 783FCBGA - Trays |
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