Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

CY28342OC Datasheet(PDF) 11 Page - Cypress Semiconductor

Part # CY28342OC
Description  High-performance SiS645/650 Pentium 4 Clock Synthesizer
Download  22 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CY28342OC Datasheet(HTML) 11 Page - Cypress Semiconductor

Back Button CY28342OC Datasheet HTML 7Page - Cypress Semiconductor CY28342OC Datasheet HTML 8Page - Cypress Semiconductor CY28342OC Datasheet HTML 9Page - Cypress Semiconductor CY28342OC Datasheet HTML 10Page - Cypress Semiconductor CY28342OC Datasheet HTML 11Page - Cypress Semiconductor CY28342OC Datasheet HTML 12Page - Cypress Semiconductor CY28342OC Datasheet HTML 13Page - Cypress Semiconductor CY28342OC Datasheet HTML 14Page - Cypress Semiconductor CY28342OC Datasheet HTML 15Page - Cypress Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 22 page
background image
CY28342
Document #: 38-07349 Rev. *A
Page 11 of 22
System Self-recovery Clock Management
This feature is designed to allow the system designer to
change frequency while the system is running and reboot the
operation of the system in case of a hang up due to the
frequency change.
When the system sends an SMBus command requesting
a frequency change through byte 4 or through bytes 13 and
14, it must have previously sent a command selecting which
time-out stamp the Watchdog must perform to byte 12, or the
system self-recovery feature will not be applicable. Conse-
quently this device will change frequency, and then the
Watchdog timer starts timing. Meanwhile, the system BIOS is
running its operation with the new frequency. If this device
receives a new SMBus command to clear the bits originally
programmed in byte 12, bits(3:0) (reprogram to 0000) before
Watchdog times out, this device will keep operating in its
normal condition with the new selected frequency. If the
Watchdog times out the first time before the new SMBus repro-
grams byte 12, bits(3:0) to (0000), then this device will send
a low system reset pulse, on SRESET# (see byte 12, bit 7),
and changes the Watchdog alarm (byte 12, bit 4) status to “1”
then restarts the Watchdog timer. If the Watchdog times out
a second time, this device will send another low pulse on
SRESET#, will relatch original hardware strapping frequency
(or second-to-last software-selected frequency, see byte 12,
bit6) selection, set Watchdog alarm bit (byte 12, bit4) to “1,”
then start the Watchdog timer again. The above-described
sequence will keep repeating until the BIOS clears the SMBus
byte 12 bits(3:0). Once the BIOS sets byte 12 bits(3:0) = 0000,
the Watchdog timer is turned off and the Watchdog alarm bit
(byte 12, bit 4) is reset to “0.”
S y s t e m r u nn i n g w i t h
o r ig in a lly s e le c t e d
f r eq ue nc y v i a
h a rd w a re s t ra p p i n g .
R e c e i v e F r eq ue nc y
C h ang e R e qu es t v i a
SM Bu s By t e 4 o r V i a D i a l -
a - f r eq ue nc y ?
S t a r t i n te r n a l w a tc h d o g ti m e r .
W a t c h D o g t i m e ou t ?
T u r n o f f w a t c h do g
t i m e r .
K e e p n e w fr e q u e n c y s e tti n g . S e t W D a l a r m
bi t ( b y t e 1 2 , b i t 4 ) t o ’’0 ’
1 )
S e nd a n o t h e r 3m S l o w pu l s e on S R E S E T
2 )
R e la t c h o r ig in a l h a r d w a r e s t r a p p in g s e l e c t io n
fo r r e t u r n t o o r i g i n a l fr e q u e n c y s e tti n g s .
3 ) S e t W D A l a r m
b i t ( b y t e 1 2 , B i t 4 ) to " 1 "
4 ) S t a r t W D ti m e r
F r eq ue nc y w i l l c h a n g e bu t S y s t e m
S e l f
R e c o v e r y no t a p p l i c ab l e ( n o t i m e s t am p
s e l e c t e d an d by t e 12 , b i t ( 3: 0) i s s t i l l =
" 0 000 "
No
No
Ye s
No
No
Ye s
SM Bu s b y t e 1 2 t i m e
ou t s t am p d i s a bl ed ?
Is S M B u s B y te 9 , ti m e o u t
s t am p en abl e d - ( b y t e 12 , b i t
( 3 :0 )
0 0 0 0 ) ?
C h an ge t o a n e w
f r eq ue nc y
Ye s
1 ) Se n d S R ES ET
pu l s e
2) S e t W D bi t
( b y t e1 2, bi t 4 ) t o ’1 ’
3 ) S t a r t W D t i m e r
Ye s
W a tc h D o g ti m e o u t?
No
Ye s
S M B u s b y te 9 ti m e o u t
s t am p d i s a bl ed , B y t e
1 2 , bi t ( 3 : 0) = ( 0 00 0) ?
Ye s
No


Similar Part No. - CY28342OC

ManufacturerPart #DatasheetDescription
logo
SpectraLinear Inc
CY28342OC SPECTRALINEAR-CY28342OC Datasheet
258Kb / 21P
   High-performance SiS645/650 Pentium짰 4-Clock Synthesizer
CY28342OCT SPECTRALINEAR-CY28342OCT Datasheet
258Kb / 21P
   High-performance SiS645/650 Pentium짰 4-Clock Synthesizer
More results

Similar Description - CY28342OC

ManufacturerPart #DatasheetDescription
logo
SpectraLinear Inc
CY28342 SPECTRALINEAR-CY28342 Datasheet
258Kb / 21P
   High-performance SiS645/650 Pentium짰 4-Clock Synthesizer
logo
Cypress Semiconductor
C9827H CYPRESS-C9827H Datasheet
171Kb / 25P
   High Performance Pentium 4 Clock Synthesizer
CY28381 CYPRESS-CY28381 Datasheet
143Kb / 19P
   High-Performance SiS645DX/648DX/650/651 Intel Pentium 4 Clock Synthesizer
logo
Integrated Device Techn...
IDT74FCT3907 IDT-IDT74FCT3907 Datasheet
104Kb / 7P
   3.3V PENTIUM??CLOCK SYNTHESIZER
logo
Cypress Semiconductor
C9870G CYPRESS-C9870G Datasheet
175Kb / 25P
   High Performance Pentium짰 4 Clock Synthesizer
CY2254A CYPRESS-CY2254A Datasheet
94Kb / 8P
   Pentium Processor Compatible Clock Synthesizer/Driver
logo
Maxim Integrated Produc...
MAX3674 MAXIM-MAX3674 Datasheet
314Kb / 19P
   High-Performance, Dual-Output, Network Clock Synthesizer
Rev 0; 12/07
logo
Pericom Semiconductor C...
PI6C104 PERICOM-PI6C104 Datasheet
560Kb / 14P
   Spread Spectrum Clock Synthesizer for Desktop Pentium II
logo
Texas Instruments
CDC7005 TI-CDC7005 Datasheet
397Kb / 29P
[Old version datasheet]   3.3-V HIGH PERFORMANCE CLOCK SYNTHESIZER AND JITTER CLEANER
logo
Motorola, Inc
MC12429 MOTOROLA-MC12429 Datasheet
123Kb / 12P
   HIGH FREQUENCY CLOCK SYNTHESIZER
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com