
Synchronous Operation
MOTOROLA
Synchronous DRAM Controller Module
7-11
7.3.3.2 INTERFACING EXAMPLE
The tables in the previous section can be used to configure the interface in the following example. To
interface one 1M x 16-bit x 4 bank SDRAM component (8 columns) to the MCF5249, the connections
7.3.3.3 BURST PAGE MODE
SDRAM can efficiently provide data when an SDRAM page is opened. As soon as SDCAS is issued, the
SDRAM accepts a new address and asserts SDCAS every clock for as long as accesses are in that page.
In burst page mode, there are multiple read or write operations for every ACTV command in the SDRAM if
the requested transfer size exceeds the port size of the associated SDRAM. The primary cycle of the
transfer generates the ACTV and READ or WRITE commands; secondary cycles generate only READ or WRITE
commands. As soon as the transfer completes, the PALL command is generated to prepare for the next
access.
Table 7-10 SDRAM Interface (16-Bit Port, 8-Column Address Lines)
MCF5249 Pins
A16
A15
A14
A13
A12
A11
A10
A9
A17
A18
A19
A20
A21
A22
A23
Row
16
15
14
13
12
11
10
9
17
18
19
20
21
22
23
Column
12345678
SDRAM Pins
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
Table 7-11 SDRAM Interface (16-Bit Port, 9-Column Address Lines)
MCF5249 Pins
A16
A15
A14
A13
A12
A11
A10
A9
A18
A19
A20
A21
A22
A23
Row
16151413121110
9
181920212223
Column
12345678
17
SDRAM Pins
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
Table 7-12 SDRAM Interface (16-Bit Port, 10-Column Address Lines)
Pins
A16
A15
A14
A13
A12
A11
A10
A9
A18
A20
A21
A22
A23
Row
16151413121110
9
1820212223
Column
12345678
17
19
SDRAM Pins
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
Table 7-13 SDRAM Interface (16-Bit Port, 11-Column Address Lines)
Pins
A16
A15
A14
A13
A12
A11
A10
A9
A18
A20
A22
A24
Row
16151413121110
9
18202223
Column
12345678
17
19
21
SDRAM Pins
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
Table 7-14 SDRAM Hardware Connections
SDRAM Pins
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10 = CMD
A11
BA0
BA1
MCF5249 Pins
A16
A15
A14
A13
A12
A11
A10
A9
A17
A18
A19
A20
A21
A22
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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