mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 434

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Bus Control Signals
Table 19-6 shows how BS[3:0] should be connected to DQMx for 16- and 32-bit SDRAM
configurations.
19-20
Table 19-5. Byte Strobe Operation for 16-Bit Data Bus—SDRAM Cycles
Table 19-4. Byte Strobe Operation for 16-Bit Data Bus—SRAM Cycles
In 16-bit bus mode, longword accesses are performed as two
sequential word accesses.
BS3 BS2 BS1 BS0
Table 19-3. Byte Strobe Operation for 32-Bit Data Bus
1
1
1
1
0
1
0
0
1
1
1
0
1
0
0
1
1
1
0
1
1
0
0
1
1
0
1
1
0
0
1
1
0
1
1
0
1
0
1
0
1
1
0
1
0
BS1 BS0 Access Size Data Located On
BS3 BS2
1
1
0
0
1
1
0
0
1
0
1
1
1
0
1
0
0
1
1
1
0
1
0
1
0
1
0
1
0
1
0
MCF5272 User’s Manual
FLASH/SRAM
FLASH/SRAM
FLASH/SRAM
FLASH/SRAM
FLASH/SRAM
FLASH/SRAM
FLASH/SRAM
Access Type
SDRAM
SDRAM
SDRAM
SDRAM
SDRAM
SDRAM
SDRAM
None
Access
None
Word
None
Word
Type
Byte
Byte
Byte
Byte
NOTE
Access Size Data Located On
Data Located On
Longword
Longword
None
Word
Word
Byte
Byte
D[31:24]
D[23:16]
D[31:16]
D[23:16]
D[31:24]
D[31:16]
—
—
D[31:24]
D[23:16]
D[31:16]
D[23:16]
D[31:24]
D[31:16]
D[15:8]
D[15:0]
D[31:0]
D[15:8]
D[15:0]
D[31:0]
D[7:0]
D[7:0]
—
MOTOROLA