Cypress CY7C144, CY7C145 manual Semaphore Read After Write Timing, Either Side25

Page 10

 

 

 

CY7C145, CY7C144

Switching Waveforms (continued)

 

 

 

Figure 10. Semaphore Read After Write Timing, Either Side[25]

 

 

tAA

tOHA

A0−A 2

VALID ADDRESS

VALID ADDRESS

 

 

tAW

tACE

 

 

tHA

 

SEM

 

 

tSCE

tSOP

 

 

 

 

tSD

 

 

I/O0

DATA IN VALID

 

DATA OUT VALID

 

 

tSA

tHD

 

 

tPWE

 

 

R/W

 

 

 

 

tSWRD

tDOE

 

OE

 

tSOP

 

 

WRITE CYCLE

READ CYCLE

 

 

Figure 11. Semaphore Contention[26, 27, 28]

 

A0L−A 2L

MATCH

 

 

R/WL

SEML

A0R−A 2R

tSPS

MATCH

R/WR

SEMR

Notes

25.CE = HIGH for the duration of the above timing (both write and read cycle).

26.I/O0R = I/O0L = LOW (request semaphore); CER = CEL = HIGH

27.Semaphores are reset (available to both ports) at cycle start.

28.If tSPS is violated, the semaphore will definitely be obtained by one side or the other, but there is no guarantee which side will control the semaphore.

Document #: 38-06034 Rev. *D

Page 10 of 21

[+] Feedback

Page 9 Page 11
Image 10
Page 9 Page 11
Contents Functional Description FeaturesLogic Block Diagram Cypress Semiconductor Corporation 198 Champion CourtPin Configurations Pin Plcc Top ViewSelection Guide Description Pin Definitions Left Port Right Port DescriptionUnit Maximum Ratings Electrical Characteristics Over the Operating RangeOperating Range Capacitance Parameter Description Test Conditions Max UnitSwitching Characteristics Over the Operating Range9 7C144-35 7C144-55 Parameter Description 7C145-15 Switching Characteristics Over the Operating Range7C144-15 7C145-35 7C145-55 Unit MinSwitching Waveforms Read Cycle No Either Port Address Access15CY7C145, CY7C144 Semaphore Read After Write Timing, Either Side25 Read with Busy M/S=HIGH20 CER Valid First Right Address Valid FirstRight Side Sets INT L Left Side Sets INT RRight Side Clears INT R Left Side Clears IntlArchitecture Interrupt Operation Example assumes = High Non-Contending Read/Write Inputs OutputsOperation Function Left Port Right PortTypical DC and AC Characteristics Pin Plastic Leaded Chip Carrier CY7C144-15JXC Ordering Information8K x8 Dual-Port Sram Pin Plastic Leaded Chip Carrier CY7C144-55JXC8K x9 Dual-Port Sram Pin Plastic Leaded Chip Carrier CY7C145-35JXCPackage Diagrams Pin Thin Plastic Quad Flat Pack 14 x 14 x 1.4 mm A65Pin Thin Plastic Quad Flat Pack A80 Worldwide Sales and Design Support Products PSoC Solutions Sales, Solutions and Legal InformationDocument History

CY7C145, CY7C144 specifications

Cypress Semiconductor is renowned for its advanced memory solutions, and two of its noteworthy products are the CY7C144 and CY7C145, both of which serve as emerging leaders in the field of synchronous dynamic random-access memory (SDRAM). These memory chips provide high-speed data access, making them ideal for various applications, including networking, automotive, and industrial electronics.

The CY7C144 is a 4-Mbit SRAM, while its counterpart, the CY7C145, is an 8-Mbit SRAM. Both chips utilize a synchronous interface, which allows them to operate at clock rates that significantly enhance data retrieval speeds. Designed for low power consumption, these devices feature several power-saving modes, making them suitable for battery-operated applications.

One of the main features of the CY7C144 and CY7C145 is their support for burst read and write operations. This function enables the memory to deliver multiple bits of data sequentially with a single command, substantially increasing throughput. Additionally, both models come with a wide data bus, typically 16 bits, allowing for efficient data handling and alignment with a variety of systems.

The technology behind these chips includes static CMOS processes, which promote high performance and reliability under various operating environments. The CY7C144 and CY7C145 both guarantee a high level of data integrity, thanks to advanced error detection and correction features. This makes them especially valuable in applications where data accuracy is critical.

Another critical aspect is the integration of an on-chip address decoder for efficient memory addressing, minimizing delays during data access. This characteristic plays a crucial role in optimizing the overall system performance, particularly in high-bandwidth applications.

In terms of environmental resilience, these memories are designed to withstand a range of temperatures, making them robust enough for industrial applications. The CY7C144 and CY7C145 also comply with several industry standards, ensuring compatibility with a wide array of devices and systems.

In summary, the CY7C144 and CY7C145 by Cypress Semiconductor stand out due to their blend of high speed, low power consumption, and robust reliability. With advanced features like burst read/write capabilities, error detection, and temperature resilience, these memory chips are exceptional choices for modern electronic applications demanding speed and efficiency. Their continued evolution reflects Cypress's commitment to innovation in the semiconductor industry, catering to the growing needs of a data-driven world.
Top Page Image Contents