データシートサーチシステム
Selected language   Japanese  ▼

Delete All
ON OFF
ALLDATASHEET.JP

X  

Preview PDF Download HTML

MC68340 データシート(PDF) 90 Page - Freescale Semiconductor, Inc

部品番号. MC68340
部品情報  Integrated Processor with DMA User’s Manual
ダウンロード  441 Pages
Scroll/Zoom Zoom In 100% Zoom Out
メーカー  FREESCALE [Freescale Semiconductor, Inc]
ホームページ  http://www.freescale.com
Logo 

MC68340 Datasheet(HTML) 90 Page - Freescale Semiconductor, Inc

Zoom Inzoom in Zoom Outzoom out
 90 / 441 page
background image
MOTOROLA
MC68340 USER’S MANUAL
3- 41
Figure 3-22 is a flowchart showing bus arbitration for a single device. This technique
allows processing of bus requests during data transfer cycles. Refer to Figures 3-23 and
3-24 for bus arbitration timing diagrams.
BR is negated at the time that BGACK is asserted. This type of operation applies to a
system consisting of the MC68340 and one device capable of bus mastership. In a system
having a number of devices capable of bus mastership,
BR from each device can be wire-
ORed to the MC68340. In such a system, more than one bus request could be asserted
simultaneously.
BG is negated a few clock cycles after the transition of BGACK. However,
if bus requests are still pending after the negation of
BG, the MC68340 asserts another BG
within a few clock cycles after it was negated. This additional assertion of
BG allows
external arbitration circuitry to select the next bus master before the current bus master
has finished using the bus. The following paragraphs provide additional information about
the three steps in the arbitration process. Bus arbitration requests are recognized during
normal processing,
HALT assertion, and a CPU32 halt caused by a double bus fault.
GRANT BUS ARBITRATION
1. ASSERT BG
TERMINATE ARBITRATION
1. NEGATE BG (AND WAIT FOR
BGACK TO BE NEGATED)
RE-ARBITRATE OR RESUME
PROCESSOR OPERATION
PROCESSOR
REQUESTING DEVICE
REQUEST THE BUS
1. ASSERT BR
ACKNOWLEDGE BUS MASTERSHIP
1. EXTERNAL ARBITRATION DETERMINES
NEXT BUS MASTER
2. NEXT BUS MASTER WAITS FOR BGACK
TO BE NEGATED
3. NEXT BUS MASTER ASSERTS BGACK
TO BECOME NEW MASTER
4. BUS MASTER NEGATES BR
OPERATE AS BUS MASTER
RELEASE BUS MASTERSHIP
1. NEGATE BGACK
1. PERFORM DATA TRANSFERS (READ AND
WRITE CYCLES) ACCORDING TO THE
SAME RULES THE PROCESSOR USES
Figure 3-22. Bus Arbitration Flowchart for Single Request
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


Html ページ

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79  80  81  82  83  84  85  86  87  88  89  90  91  92  93  94  95  96  97  98  99  100   ...More


Datasheet Download



関連電子部品番号

部品番号コンポーネントの説明Html Viewメーカー
HMC585MS8GHIGH IP3 GaAs MMIC MIXER with INTEGRATED LO AMPLIFIER 400 - 650 MHz 1 2 3 4 5 MoreHittite Microwave Corporation
ADA4412-3Integrated Triple Video Filter with Selectable Cutoff Frequencies for RGB HD/SD 1 2 3 4 5 MoreAnalog Devices
LMX2531LQ1500EHigh Performance Frequency Synthesizer System with Integrated VCO 1 2 3 4 5 MoreNational Semiconductor (TI)
MSP34X1GMultistandard Sound Processor Family with Virtual Dolby Surround 1 2 3 4 5 MoreMicronas
ADN2804622 Mbps Clock and Data Recovery IC with Integrated Limiting Amplifier 1 2 3 4 5 MoreAnalog Devices
AD999212-Bit CCD Signal Processor with Precision Timing Generator 1 2 3 4 5 MoreAnalog Devices
ADE7768Energy Metering IC with Integrated Oscillator and Positive Power Accumulation 1 2 3 4 5 MoreAnalog Devices
CS5302Two−Phase Buck Controller with Integrated Gate Drivers and 4−Bit DAC 1 2 3 4 5 MoreON Semiconductor
CS5303Three−Phase Buck Controller with Integrated Gate Drivers 1 2 3 4 5 MoreON Semiconductor
CS5308Two−Phase PWM Controller with Integrated Gate Drivers for VRM 8.5 1 2 3 4 5 MoreON Semiconductor

リンク URL



Privacy Policy
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   ブックマーク
   |   リンク交換   |   メーカーリスト
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn