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Board Description and Memory Maps

M_SPD[0:1]

Memory Speed. This field relays the memory speed information as follows:

M_SPD[0:1]

DRAM Speed

DRAM Type

 

 

 

0B00

70ns

Past Page

 

 

 

0B01

60ns

Fast Page

 

 

 

0B10

Reserved

Reserved

 

 

 

0B11

50ns

EDO

 

 

 

These two bits reflect the combined status of the four blocks of DRAM. Initialization software uses this information to program the ram_spd0 and ram_spd1 control bits in the Falcon’s Chip Revision register.

R_A/B_TYP[0:2]

ROM/Flash Type. This field is encoded as follows:

ROM_A/B_TYP[0:2]

ROM/Flash Type

 

 

0B000 to 0B101

Reserved

 

 

0B110

Intel 16-bit wide Flash with 16K Bottom Boot

 

Block

 

 

0B111

Unknown type (i.e. ROM/Flash sockets)

 

 

Note The device width differs from the width of the Flash bank. If the bank width is 64 bits and the device width is 16 bits, then the Flash bank consists of four Flash devices.

L2_TYPE[0:3]

L2 Memory Type. This field is encoded as follows:

L2_TYPE[0:3]

Configuration

 

 

0B0000

Late write Sync

 

 

0B0001

Pipelined Sync Burst

 

 

0B0010 to 0B1111

Reserved

 

 

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Computer Group Literature Center Web Site

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Image 52
Motorola MVME2300 Series manual MSPD01, RA/BTYP02, L2TYPE03