Memory Controller
15-26 MPC823e REFERENCE MANUAL MOTOROLA
MEMORY CONTROLLER
15
15.3.1.7 MEMORY DATA REGISTER. The memory data register (MDR) contains the data
to be written to or read from the RAM array for UPM command operations. This register must
be set up before you issue a write command to the memory command register.
MD—Memory Data
This field contains the RAM array word.
15.3.1.8 MEMORY ADDRESS REGISTER. The memory address register (MAR) contains
an address to be output on the address lines that are controlled by the AMX field in the RAM
word of the RAM array.
MA—Memory Address
This field contains a 32-bit address to be output on the address bus if the AMX field is equal
to 11. Refer to Section 15.5.4 The RAM Array for more information.
MDR
BIT 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
FIELD MD
RESET 0
R/W R/W
ADDR (IMMR & 0xFFFF0000) + 0x17C
BIT 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
FIELD MD
RESET 0
R/W R/W
ADDR (IMMR & 0xFFFF0000) + 0x17E
MAR
BIT 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
FIELD MA
RESET 0
R/W R/W
ADDR (IMMR & 0xFFFF0000) + 0x164
BIT 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
FIELD MA
RESET 0
R/W R/W
ADDR (IMMR & 0xFFFF0000) + 0x166
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