Programming Model

 

 

 

 

 

 

 

 

 

 

 

RSIZ2

RSIZ1

RSIZ0

DRAM Array Size

 

 

 

 

 

 

0

0

0

4MB using one 144-bit wide

 

 

 

 

block of 256Kx4 DRAMs

 

 

 

 

 

 

0

0

1

8MB using two 144-bit wide

 

 

 

 

blocks of 256Kx4 DRAMs

 

 

 

 

 

 

0

1

0

16MB using one 144-bit wide

 

 

 

 

block of 1Mx4 DRAMs

 

 

 

 

 

 

0

1

1

32MB using two 144-bit wide

 

 

 

 

blocks of 1Mx4 DRAMs

 

 

 

 

 

 

1

0

0

64MB using one 144-bit wide

 

 

 

 

block of 4Mx4 DRAMs

 

 

 

 

 

 

1

0

1

128MB using two 144-bit wide

 

 

 

 

blocks of 4Mx4 DRAMs

 

 

 

 

 

 

1

1

0

Reserved

 

 

 

 

 

 

1

1

1

Reserved

 

 

 

 

 

The states of RSIZ2-0 after power-up, soft, or local reset, match those of the RSIZ2-0 bits from the reset serial bit stream.

SELI1, SELI0

The SELI1, SELI0 control bits determine the base address at which the control and status registers respond as shown below:

SELI1

SELI0

Register Base Address

 

 

 

0

0

$FFF43000

 

 

 

0

1

$FFF43100

 

 

 

1

0

$FFF43200

 

 

 

1

1

$FFF43300

 

 

 

The states of SELI1 and SELI0 after power-up, soft, or local reset, match those of the SELI1 and SELI0 bits from the reset serial bit stream.

FSTRD The FSTRD control bit determines the speed at which DRAM reads occur. When it is 1, DRAM reads happen at full speed. When it is 0, DRAM reads are slowed by one

5

http://www.mcg.mot.com/literature

5-35

Page 325
Image 325
Motorola MVME172 manual SELI1, SELI0, Dram Array Size, Register Base Address