Memories Forum Discussions

Hi Team,

I am working on CY62157EV30LL 45ZXi SRAM chip on imx53 processor connected through EIM interface.
1.When I write data , it hsows as written proper data but when reading it shows same 2 byte data reading for other 2 bytes also.
Example, 0x12345678 is written , when read backs it shows as 0x12341234

2. When I read for next address and so on , it shows the previously read value only like 0x12341234 as shown below
debian@arm:~$ sudo ./devmem2 0xf0000000 w 0x12345678
/dev/mem opened.
Memory mapped at address 0xb6fed000.
Value at address 0xF0000000 (0xb6fed000): 0xABCDABCD
Written 0x12345678; readback 0x12341234
debian@arm:~$ 
debian@arm:~$ 
debian@arm:~$ 
debian@arm:~$ sudo ./devmem2 0xf0000000
/dev/mem opened.
Memory mapped at address 0xb6ff0000.
Value at address 0xF0000000 (0xb6ff0000): 0x12341234
debian@arm:~$ 
debian@arm:~$ 
debian@arm:~$ 
debian@arm:~$ 
debian@arm:~$ sudo ./devmem2 0xf0000004
/dev/mem opened.
Memory mapped at address 0xb6fde000.
Value at address 0xF0000004 (0xb6fde004): 0x12341234
debian@arm:~$ sudo ./devmem2 0xf0000008
/dev/mem opened.
Memory mapped at address 0xb6fbe000.
Value at address 0xF0000008 (0xb6fbe008): 0x12341234

3.Can anyine tell me what are the working timing parameters to be configured on imx side for cy6215 sram chip.

4.How to change the EIM frequency

Hello,

The customer is considering reducing the power consumption of equipment that is in standby mode for a long period of time.
The power supply to Sync SRAM cannot be stopped because it is shared with other devices.
Therefore, I'm thinking of stopping the clock signal from FPGA to SRAM to reduce power consumption.

1) What is the current consumption of SRAM in Standby: Clock stopped?
2) This SRAM has DOFF# (PLL turn off).
Is it possible to reduce power consumption by setting this pin to High as well?
What is the current consumption with Clock stopped and PLL turned off?

MPN: CY7C2265KV18-550BZXI

Best regards,

Naoaki Morimoto

Please help to check the chip, may i know the whether the chip construction is correct

CY62157EV30LL-45ZSXIT       DC 2237                Lot# 612226025                   COO: Philippines

Part Number:CY62187EV30LL-55BAXI

Date Code:：2243; 2231、2225

Problem description：The part number is CY62187EV30LL-55BAXI. Part Dies with date codes 2231 and 2225 are shown in pictures 1, 2 and 3. The part die with date code 2243 is shown in pictures 4, 5 and 6.
Are both kinds of die applicable to this part?

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