M E M O R Y C O N T RO L L E R

SDRAM Initialization

Left-shift value table: 32-bit wide data bus SDRAM (RBC)

10Set the SDRAMInit value in the Dynamic Control register to 01 — Issue SDRAM Mode command.

11Program the SDRAM memory 10-bit mode register. The mode register enables these parameters to be programmed:

Bit

Parameter

Parameter description

 

 

 

02:00

Burst length

4 for a 32-bit wide external bus

 

 

8 for a 16-bit wide external bus

 

 

 

03

Burst type

Sequential

 

 

 

06:04

CAS latency

Dependent on the SDRAM device and operating

 

 

frequency

 

 

 

08:07

Operating mode

Standard operation

 

 

 

09

Write burst mode

Programmed burst length

 

 

 

A read transaction from the SDRAM memory programs the mode register. The transfer address contains the value to be programmed. Address bits 31:28 determine the chip select of the specific SDRAM that is being programmed. The 10-bit mode value must be shifted left per the specific device being programmed; see the tables following this procedure to determine the left shift value.

All other address bits must be set to 0.

12Set the SDRAMInit value in the Dynamic Control register to 00 — Issue SDRAM nor- mal operation command.

13Enable the buffers by writing a 1 to the buffer enable bit in the Dynamic Config- uration N register.

The SDRAM is now ready for normal operation.

Device size

Configuration

Load Mode register left shift

 

 

 

16M

2 x 1M x 16

11

 

 

 

 

4 x 2M x 8

12

 

 

 

64M

1 x 2M x 32

12

 

 

 

 

2 x 4M x 16

12

 

 

 

 

4 x 8M x 8

13

 

 

 

128M

1 x 4M x 32

12

 

 

 

 

2 x 8M x 16

13

 

 

 

 

4 x 16M x 8

14

226Hardware Reference NS9215

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Digi NS9215 manual Left-shift value -bit wide data bus Sdram RBC, Bit Parameter Parameter description

NS9215 specifications

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