Motorola MVME2400 Series Service Manual Page 269

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Software Considerations
http://www.mcg.mot.com/literature 3-83
3
Notes 1. Total Number of block Locations (L) is 2
R
x 2
C
x 4 where
R is the value in SPD byte 3 and C is the value in SPD byte 4.
2. Primary Device Width is from SPD byte 13.
3. Block Size is the total number of block locations (L) x 8
bytes.
4. ram_x_siz refers to ram_a_siz, ram_b_siz, ram_c_siz, etc.
(Refer to the sections titled “SDRAM Enable and Size
Register (Blocks A,B,C,D)” and “SDRAM Enable and Size
Register (Blocks E,F,G,H)” for more information.)
10. Make sure the software is no longer using SDRAM, and disable the
block that was being used.
11. Wait for at least one SDRAM refresh to complete. A simple way to
do this is to wait for the 32-bit counter to increment at least 100
times. (Refer to the section titled “32-Bit Counter” for more
Table 3-19. Programming SDRAM SIZ Bits
Total Number
of Locations
within the
Block (L)
1
Primary
Device Width
2
Block Size
3
Value to be
programmed
into the
Block’s
ram_x_siz bits
4
4M 16 32Mbytes %0001
8M 8 64Mbytes %0010
8M 16 64Mbytes %0011
16M 4 128Mbytes %0100
16M 8 128Mbytes %0101
16M 16 128Mbytes %0110
32M 4 256Mbytes %0111
32M 8 256Mbytes %1000
64M 4 512Mbytes %1001
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