Table 3-19. Programming Sdram Siz Bits - Motorola MVME5100 Programmer's Reference Manual

Table 3-19. Programming SDRAM SIZ Bits

Total Number of
Locations within
1
the Block (L)
4M
8M
8M
16M
16M
16M
32M
32M
64M
Notes 1. Total Number of block Locations (L) is 2
6. Make sure the software is no longer using SDRAM, and disable the
7. Wait for at least one SDRAM refresh to complete. A simple way to
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Primary
2
Device Width
16
8
16
4
8
16
4
8
4
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.
block that was being used.
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
information). Note that the refdis control bit must not be set in the
ECC Control Register.
Software Considerations
3
Block Size Value to be
programmed into
the Block's
ram_x_siz bits
32MB
64MB
64MB
128MB
128MB
128MB
256MB
256MB
512MB
R
x 2
4
%0001
%0010
%0011
%0100
%0101
%0110
%0111
%1000
%1001
C
x 4 where
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