PPC7A Product Manual
Functional Description
8-20
1
st
Edition
Certain registers are described in detail in the following pages. The others are registers in the ISA Bridge
or other major devices, which are described in the detail in the appropriate device data sheet (which will
also give the appropriate ‘Type’ column entry).
In the following register descriptions, the bit significance is shown in big-endian mode (i.e. from the
viewpoint of the PowerPC 750 programmer).
Memory Configuration Register (Port 0x0804)
This register provides information on the SDRAM fitted.
MSB = D0, LSB = D7
D0: Memory
type
1 = SDRAM
D1:
NVRAM type
0 = FRAM
1
=
NVSRAM
D2 to D4: Reserved always read as '1'
D5:
Reserved always read as '0'
D6:
SDRAM Bank 1 Fitted
0 = Fitted
1 = Not fitted
D7:
SDRAM Bank 0 Fitted, always read as ‘0’
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