CY2305 Cypress Semiconductor, CY2305 Datasheet - Page 10

• Manufacturer Part Number: CY2305
• Description: CY2305 and CY2309 as PCI and SDRAM Buffers
• Manufacturer: Cypress Semiconductor

The Self Adjusting Solution:
© Cypress Semiconductor Corporation, 1997. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor does not authorize
its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges.
• This solution will automatically compensate for different
• CLKOUT must drive CK0 on the SDRAM module 1 and
SDRAM input loads (only on Module 1 and Module 3).
module 3 so that CLKOUT is always fully loaded (pin 42
on the SDRAM module).
CPUCLK
Decoding
Decoding
Logic
Logic
REF
S1
S2
CY2309
Zero Delay
Buffer
REF
S1
S2
CY2309
Zero Delay
Buffer
CLKOUT
CLKA1
CLKA2
CLKA3
CLKA4
CLKB1
CLKB2
CLKB3
CLKB4
CLKOUT
CLKA1
CLKA2
CLKA3
CLKA4
CLKB1
CLKB2
CLKB3
CLKB4
CY2305 and CY2309 as PCI and SDRAM Buffers
• SDRAM modules must be installed in order (module 1 first
• Clocks are three-stated when that SDRAM module is not
and module 4 last).
present, but CLKOUT will continue to run.
SDRAM Module 1
SDRAM Module 2
SDRAM Module 3
SDRAM Module 4
Module Sense
Module Sense
Module Sense
Module Sense