參數(shù)資料
型號(hào)： IBM25PPC750GXEBR2532T
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 800 MHz, RISC PROCESSOR, CBGA292
封裝： 21 X 21 MM, 1 MM PITCH, LEAD FREE, CERAMIC, BGA-292
文件頁(yè)數(shù)： 41/74頁(yè)
文件大小： 1054K
代理商： IBM25PPC750GXEBR2532T
Datasheet
IBM PowerPC 750GX RISC Microprocessor
DD1.X
System Design Information
Page 46 of 73
750GX_ds_body.fm SA14-2765-02
September 2, 2005
5. System Design Information
This section provides electrical and thermal design recommendations for successful applications on the
750GX.
5.1 Core Voltage Operation
The 750GX supports a single VDD setting for a specific application condition. The AVDD supplies can be set to
the same voltage as VDD, and the PLL range (PLL_RNG[0:1]) bits are as defined in Table 5-1 on page 48.
5.2 Low Voltage Operation at Lower Frequency
Due to the relationship of power to frequency and voltage (power proportional to frequency and a square of
voltage), running the processor at an associated lower voltage and lower frequency results in significant
power savings. Low voltage application conditions will be defined after characterization is completed.
After the 750GX application condition, within the supported limits, has been selected, the 750GX’s dual PLL
feature can also be used to provide additional power savings.
5.2.1 Overview
The 750GX design includes two PLLs (PLL0 and PLL1), allowing the processor clock frequency to dynami-
cally change between the PLL frequencies via software control. Use the bits in Hardware Implementation
Dependent Register 1 (HID1) to specify:
The frequency range of each PLL
The clock multiplier for each PLL
External or internal control of PLL0
Which PLL is selected (which is the source of the processor clock at any given time)
At power-on reset, the HID1 register contains zeros for all the non-read-only bits (bits 7 to 31). This configura-
tion corresponds to the selection of PLL0 as the source of the processor clocks and selects the external
configuration and range pins to control PLL0. The external configuration and range pin values are accessible
to software using HID1 read-only bits 0-6. PLL1 is always controlled by its internal configuration and range
bits. The HID1 setting associated with hard reset corresponds to a PLL1 configuration of clock off, and selec-
tion of the medium frequency range.
As stated in the hardware specification, HRESET must be asserted during power up long enough for the
PLL(s) to lock, and for the internal hardware to be reset. Once this timing is satisfied, HRESET can be
negated. The processor now will proceed to execute instructions, clocked by PLL0 as configured via the
external pins. The processor clock frequency can be modified from this initial setting in one of two ways. First,
as with earlier designs, HRESET can be asserted, and the external configuration pins can be set to a new
value. The machine state is lost in this process, and, as always, HRESET must be held asserted while the
PLL relocks, and the internal state is reset. Second, the introduction of another PLL provides an alternative
means of changing the processor clock frequency, which does not involve the loss of machine state nor a
delay for PLL relock.
相關(guān)PDF資料
PDF描述
IBM25PPC750GXEBR2H32T 32-BIT, 800 MHz, RISC PROCESSOR, CBGA292
IBM25PPC750GXEBR5082T 32-BIT, 933 MHz, RISC PROCESSOR, CBGA292
IBM25PPC750GXEBR5H83T 32-BIT, 933 MHz, RISC PROCESSOR, CBGA292
IBM25PPC750GXEBR6592T 32-BIT, 1000 MHz, RISC PROCESSOR, CBGA292
IBM25PPC750GXEBR6H42T 32-BIT, 1000 MHz, RISC PROCESSOR, CBGA292
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IBM25PPC750GXECB2563T 制造商:IBM 功能描述:
IBM25PPC750GXECB2H33T 制造商:IBM 功能描述:
IBM25PPC750GXECB5H42V 制造商:IBM 功能描述:POLARIS 1.2 ? 21CBGA GRE2 ? HALFMODE 933MH - Trays
IBM25PPC750GXECB5H82T 制造商:IBM 功能描述:POLARIS 1.2 ? 21CBGA GRE2 LP HALFMODE 933 - Trays
IBM25PPC750GXECB5H82V 制造商:IBM 功能描述:POLARIS 1.2 ? 21CBGA GRE2 LP HALFMODE 933 - Trays
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*