24-8
MC9328MX1 Reference Manual
MOTOROLA
SDRAM Memory Controller
24.5 Programming Model
The SDRAM controller includes four 32-bit registers. Table 24-5 summarizes these registers and their
addresses. Registers are accessible in supervisor mode only. Attempts to access the registers in user mode
will result in a transfer error (TEA) being returned on the ARM920T processor’s local bus.
The SDRAM arrays are mapped according to Table 24-6. A 64 Mbyte space is allocated to each
chip-select. Memories smaller than the allocated region are redundantly mapped throughout the remainder
of the region. Attempted accesses to a disabled chip-select region (SDE bit of the SDCTLx = 0) and User
accesses to a protected (SP bit of the SDCTL = 1) region will result in a transfer error.
SDBA [4:0]
Multiplexed with
A [15:11]
Internal signal from SDRAMC, asserted for SDRAM accesses
SDIBA [3:0]
Multiplexed with
A [19:16]
Internal signal from SDRAMC, asserted for SDRAM accesses
DQM3
Not multiplexed
DQM2
Not multiplexed
DQM1
Not multiplexed
DQM0
Not multiplexed
SDWE
Not multiplexed
RAS
Not multiplexed
CAS
Not multiplexed
RESET_SF
Not multiplexed
Table 24-5. SDRAM Module Register Memory Map
Description
Name
Address
SDRAM 0 Control Register
SDCTL0
0x00221000
SDRAM 1 Control Register
SDCTL1
0x00221004
SDRAM Reset Register
SDRST
0x00221018
Miscellaneous Register
MISCELLANEOUS
0x00221014
Table 24-6. SDRAM Array Memory Map
Address
Use
Access
0x0800 0000 – 0x0BFF FFFF
SDRAM 0 Memory array
R/W
0x0C00 0000 – 0x0FFF FFFF
SDRAM 1 Memory array
R/W
Table 24-4. Pin Configuration (Continued)
Pin
Setting
Set-Up Procedure
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