Output signals on the SerDes interfa" />
參數(shù)資料
型號(hào)： KMPC8313EVRAFFB
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 88/99頁(yè)
文件大?。?/td> 0K
描述： IC MPU POWERQUICC II 516-PBGA
標(biāo)準(zhǔn)包裝： 2
系列： MPC83xx
處理器類型： 32-位 MPC83xx PowerQUICC II Pro
速度： 333MHz
電壓： 0.95 V ~ 1.05 V
安裝類型： 表面貼裝
封裝/外殼： 516-BBGA 裸露焊盤
供應(yīng)商設(shè)備封裝： 516-PBGAPGE（27x27）
包裝： 托盤
MPC8313E PowerQUICC II Pro Processor Hardware Specifications, Rev. 4
Freescale Semiconductor
89
Output signals on the SerDes interface are fed from the XPADVDD power plane. Input signals and
sensitive transceiver analog circuits are on the XCOREVDD supply.
Power: XPADVDD consumes less than 300 mW; XCOREVDD +SDAVDD consumes less than
750 mW.
22.3
Decoupling Recommendations
Due to large address and data buses, and high operating frequencies, the device can generate transient
power surges and high frequency noise in its power supply, especially while driving large capacitive loads.
This noise must be prevented from reaching other components in the MPC8313E system, and the
MPC8313E itself requires a clean, tightly regulated source of power. Therefore, it is recommended that
the system designer place at least one decoupling capacitor at each VDD, NVDD, GVDD, LVDD, LVDDA,
and LVDDB pin of the device. These decoupling capacitors should receive their power from separate VDD,
NVDD, GVDD, LVDD, LVDDA, LVDDB, and VSS power planes in the PCB, utilizing short traces to
minimize inductance. Capacitors may be placed directly under the device using a standard escape pattern.
Others may surround the part.
These capacitors should have a value of 0.01 or 0.1 F. Only ceramic SMT (surface mount technology)
capacitors should be used to minimize lead inductance, preferably 0402 or 0603 sizes.
In addition, it is recommended that there be several bulk storage capacitors distributed around the PCB,
feeding the VDD, NVDD, GVDD, LVDD, LVDDA, and LVDDB planes, to enable quick recharging of the
smaller chip capacitors. These bulk capacitors should have a low ESR (equivalent series resistance) rating
to ensure the quick response time necessary. They should also be connected to the power and ground
planes through two vias to minimize inductance. Suggested bulk capacitors—100 to 330 F (AVX TPS
tantalum or Sanyo OSCON). However, customers should work directly with their power regulator vendor
for best values and types of bulk capacitors.
22.4
SerDes Block Power Supply Decoupling Recommendations
The SerDes block requires a clean, tightly regulated source of power (XCOREVDD and XPADVDD) to
ensure low jitter on transmit and reliable recovery of data in the receiver. An appropriate decoupling
scheme is outlined below.
Only SMT capacitors should be used to minimize inductance. Connections from all capacitors to power
and ground should be done with multiple vias to further reduce inductance.
First, the board should have at least 10
10-nF SMT ceramic chip capacitors as close as possible
to the supply balls of the device. Where the board has blind vias, these capacitors should be placed
directly below the chip supply and ground connections. Where the board does not have blind vias,
these capacitors should be placed in a ring around the device as close to the supply and ground
connections as possible.
Second, there should be a 1-F ceramic chip capacitor from each SerDes supply (XCOREVDD and
XPADVDD) to the board ground plane on each side of the device. This should be done for all
SerDes supplies.
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