mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 198

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

Number of devices
Total size
Total page size
Number of banks
Refresh count in 64 mS
Interface to SDRAM Devices
Table 9-2 shows how BS[3:0] should be connected to DQMx for 16- and 32-bit SDRAM
configurations.
9.3 Interface to SDRAM Devices
The following tables describes possible memory configurations using most common
SDRAM devices for 16- and 32-bit wide data buses.
A device’s data bus width affects its connection to SDRAM address pins. A device can be
configured for external data bus width of 16 or 32 bits by appropriate configuration of the
WSEL signal during reset. See Section 19.18, “Operating Mode Configuration Pins.” The
following tables describe address pin connections and internal address multiplexing.
9-4
Parameter
Number of devices
Total size
Total page size
Number of banks
Refresh count in 64 mS
Parameter
16 Bit 32 Bit
8 Mbytes
BS3
BS2
16 Mbits
2 Kbytes
NC
NC
4K
Table 9-3. Configurations for 16-Bit Data Bus
Table 9-4. Configurations for 32-Bit Data Bus
5272
2
Table 9-2. Connecting BS[3:0] to DQMx
BS3
BS2
BS1
BS0
8-Bit
4
16 Mbits
4 Mbytes
32 Mbytes
1 Kbyte
2 Kbytes
64Mbits
4K
2
4K
DQMH
DQML
16 Bit
4
NC
NC
8-Bit
2
MCF5272 User’s Manual
16 Mbytes
64 Mbits
1 Kbyte
16 Mbits
4 Mbytes
32 Bit (2 x 16) 32 Bit (1 x 32)
1 Kbyte
4K
4
4K
2
DQMH
DQMH
DQML
DQML
SDRAM
512 Kbytes 512 Kbytes
16 Mbytes
16 Mbits
2 Mbytes
64 Mbits
1 Kbyte
4K
4K
2
4
16-Bit
DQM3
DQM2
DQM1
DQM0
2
128 Mbits
32 Mbytes
2 Kbytes
64 Mbits
8 Mbytes
4K
4K
4
4
16-Bit
Data Signals
1
D[31:24]
D[23:16]
D[15:8]
256 Mbits
64 Mbytes
D[7:0]
128 Mbits
16 Mbytes
2 Kbytes
1 Kbyte
8K
4K
4
4
64 Mbits
8 Mbytes
256 Mbits
32 Mbytes
1 Kbyte
1 Kbyte
4K
4
8K
4
MOTOROLA
32-Bit
1
16 Mbytes
128 Mbits
1 Kbyte
8K
4