參數(shù)資料
型號： MSC8254SVT1000B
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 數(shù)字信號處理
英文描述： 0-BIT, OTHER DSP, PBGA783
封裝： 29 X 29 MM, LEAD FREE, PLASTIC, FCBGA-783
文件頁數(shù)： 21/68頁
文件大小： 909K
代理商： MSC8254SVT1000B
MSC8254 Quad-Core Digital Signal Processor Data Sheet, Rev. 4
Electrical Characteristics
Freescale Semiconductor
28
2.5.1.4
DDR Reference Current Draw
Table 9 lists the current draw characteristics for MVREF.
Note:
Values when used at recommended operating conditions (see Table 3).
2.5.2
High-Speed Serial Interface (HSSI) DC Electrical Characteristics
The MSC8254 features an HSSI that includes two 4-channel SerDes ports used for high-speed serial interface applications (PCI
Express, Serial RapidIO interfaces, and SGMII). This section and its subsections describe the common portion of the SerDes
DC, including the DC requirements for the SerDes reference clocks and the SerDes data lane transmitter (Tx) and receiver (Rx)
reference circuits. The data lane circuit specifications are specific for each supported interface, and they have individual
subsections by protocol. The selection of individual data channel functionality is done via the Reset Configuration Word High
Register (RCWHR) SerDes Protocol selection fields (S1P and S2P). Specific AC electrical characteristics are defined in
2.5.2.1
Signal Term Definitions
The SerDes interface uses differential signaling to transfer data across the serial link. This section defines terms used in the
description and specification of differential signals. Figure 4 shows how the signals are defined. For illustration purposes only,
one SerDes lane is used in the description. Figure 4 shows the waveform for either a transmitter output (SR[1–2]_TX and
SR[1–2]_TX) or a receiver input (SR[1–2]_RX and SR[1–2]_RX). Each signal swings between A volts and B volts where
A>B.
Table 9. Current Draw Characteristics for MVREF
Parameter / Condition
Symbol
Min
Max
Unit
Current draw for MVREFn
DDR2 SDRAM
DDR3 SDRAM
IMVREFn
—
300
250
μA
Figure 4. Differential Voltage Definitions for Transmitter or Receiver
Differential Swing, VID or VOD = A – B
A Volts
B Volts
Differential Peak Voltage, VDIFFp = |A – B|
Differential Peak-Peak Voltage, VDIFFpp = 2 × VDIFFp (not shown)
SR[1–2]_TX or
SR[1–2]_RX
SR[1–2]_TX or
SR[1–2]_RX
Vcm = (A + B)/2
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