S D R A M

NS7520 signal

16M SDRAM signal

64M SDRAM signal

 

 

 

A3

A3

A3

 

 

 

A4

A4

A4

 

 

 

A5

A5

A5

 

 

 

A6

A6

A6

 

 

 

A7

A7

A7

 

 

 

A8

A8

A8

 

 

 

A9

A9

A9

 

 

 

A10

 

 

 

 

 

A11

 

A11

 

 

 

A13

 

 

 

 

 

A19

BA

 

 

 

 

A20

 

BA0

 

 

 

A21

 

BA1

 

 

 

 

 

 

BCLK

CLK

CLK

 

 

 

VCC

CKE

CKE

 

 

 

 

 

 

D31-D16

D15-00

D15-00

 

 

 

Table 44: x8 SDRAM interconnect

SDRAM A10/AP support

The SDRAM A10/AP signal multiplexes one of the RAS signals with an auto-precharge command indicator. During the active command, the A10/AP signal must provide the DRAM A10 logical RAS address value. During the read and write commands, the AP signal provides the auto-precharge command indicator. The NS7520 drives 0 during read and write commands. During the precharge command, the A10/AP signal indicates whether all banks should be precharged. The NS7520 always causes all banks to be precharged.

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Digi NS7520 manual Sdram A10/AP support