Motorola MVME2400 Series Wartungshandbuch PDF herunterladen (Seite 244)

100

101

3-58 Computer Group Literature Center Web Site

System Memory Controller (SMC)

rom_b_64 rom_b_64 indicates the width of ROM/Flash

device/devices being used for Block B. When rom_b_64

is cleared, Block B is 16 bits wide, where each half of the

SMC interfaces to 8 bits. When rom_b_64 is set, Block B

is 64 bits wide, where each half of the SMC interfaces to

32 bits. rom_b_64 matches the value that was on the RD3

pin at power-up reset. It cannot be changed by software.

rom b siz

The rom b siz control bits are the size of ROM/Flash for

Block B. They are encoded as shown in Table

3-14.

Table 3-14. ROM Block B Size Encoding

rom_b_rv

rom_b_rv and rom_a_rv determine which if either of

Blocks A and B is the source of reset vectors or any other

access in the range $FFF00000 - $FFFFFFFF as shown in

Table 3-12.

rom_b_rv

is initialized at power-up reset to match the

value on the RD1 pin.

rom b en

When rom b en is set, accesses to Block B ROM/Flash in

the address range selected by ROM B BASE

are enabled.

When rom b en

is cleared they are disabled.

rom b siz

BLOCK

SIZE

%000 1Mbytes

%001 2Mbytes

%010 4Mbytes

%011 8Mbytes

%100 16Mbytes

%101 32Mbytes

%110 64Mbytes

%111 Reserved

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