mcf5282 Freescale Semiconductor, Inc, mcf5282 Datasheet - Page 292

• Manufacturer Part Number: mcf5282
• Manufacturer: Freescale Semiconductor, Inc

Synchronous DRAM Controller Module
15.3.1
To interface this component to the DRAM controller, use the connection table that corresponds to a 32-bit
port size with 8 columns
Table 15-26
15.3.2
At power-up, the DCR has the following configuration if synchronous operation and SDRAM address
multiplexing are desired.
This configuration results in a value of 0x0026 for DCR, as shown in
15.3.3
As shown in
1-Mbyte partition in the SDRAM (each 16 Mbytes). The starting address of the SDRAM is 0xFF88_0000.
Continuous page mode feature is used.
15-20
Processor Pins A15
SDRAM Pins
10–9
Bits
8–0
15
14
13
12
11
Setting
(hex)
Field
Name
RTIM
NAM
COC
SDRAM Interface Configuration
DCR Initialization
DACR Initialization
RC
—
—
IS
shows the proper hardware connections.
Figure
—
15
A0
Setting
—
14
0x26
15-12, the SDRAM is programmed to access only the second 512-Kbyte block of each
00
0
0
0
0
0
NAM COC
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
A14
13
A1
Reserved.
Reserved.
Indicating SDRAM controller multiplexes address lines internally
SCKE is used as clock enable instead of command bit because user is not multiplexing
address lines externally and requires external command feed.
At power-up, allowing power self-refresh state is not appropriate because registers are being
set up.
Because t
Specification indicates auto-refresh period for 4096 rows to be 64 mS or refresh every 15.625
µs for each row, or 625 bus clocks at 40 MHz. Because DCR[RC] is incremented by 1 and
multiplied by 16, RC = (625 bus clocks/16) -1 = 38.06 = 0x38
(Table
12
Table 15-26. SDRAM Hardware Connections
A13
A2
Figure 15-11. Initialization Values for DCR
15-24). Two pins select one of four banks when the part is functional.
Table 15-27. DCR Initialization Values
RC
11
IS
A12
value is 70 ns, indicating a 3-clock refresh-to-
A3
10
A11
RTIM
A4
0000_0000_0010_0110
9
A10
A5
8
0026
A9
A6
Description
A17
A7
A18
A8
Table
A19
A9
RC
ACTV
15-27.
timing.
A10 = CMD
A20
Freescale Semiconductor
BA0
A21
0
BA1
A22