status of pins while using CY62157EV as 1Mx8 or 512Kx16

Question: What should be the state of the pins while using CY62157EV30LL as 1Mx8 or 512Kx16

 

Answer:

Some of our SRAM parts can be configured as 512x16 or 1Mx8. 

The state of the related pins should be as follows to choose between 512x16 and 1Mx8-

 

                                                                                         
   

      

  
   

     Status of the pin

  
   

     Name of the pin

  
   

     Mode : 512Kx16

  
   

     Mode: 1Mx8

  
   

     /BYTE

  
   

     HIGH

  
   

     LOW

  
   

     /BHE and /BLE

  
   

     Refer to the Truth table given in the datasheet

  
   

     Do Not Connect these pins, keep them floating

  
   

     Pin 45

  
   

     IO15

  
   

     A19

  

 

Note: In the datasheet of CY62157EV30LL, the pin numbers 10 & 13 are shown as DNU but their actual status is NC, i.e. they are not connected to die. Hence when replacing CY62167EV30 with CY62157EV30, pins 9, 10 and 13 can be either left floating or tied to VCC/GND.