External Interface
MOTOROLA
SDRAM Memory Controller
24-5
24.4.1 SDCLK—SDRAM Clock
The SDCLK output provides the timing reference for the memory devices. All other SDRAM interface
signals are referenced to this clock. SDCLK is synchronous to the system clock, however it is gated off
during low-power operating modes when both SDCKE0 and SDCKE1 are negated.
24.4.2 SDCKE0, SDCKE1—SDRAM Clock Enables
The SDCKE0 and SDCKE1 pins are clock enable outputs to the SDRAM memory devices. SDCKE0
corresponds to SDRAM array 0 and SDCKE1 to SDRAM array 1. When these pins are asserted high, the
memory’s clock input is active, which means that a stable clock is being supplied. The low assertion
deactivates the memory’s clock input. A low assertion of SDCKEx initiates Powerdown, Self Refresh, and
Suspend modes to the SDRAM.
24.4.3 CSD0, CSD1—SDRAM Chip-Select
CSD0 and CSD1 are used to select SDRAM array 0 and SDRAM array 1, respectively. When a valid
command is present on the other control signals, the chip-select signals are used to indicate which device
the command is directed towards.
MA [9:0]
A [10:1]
Multiplexed Address
Output
Low
SDBA [4:0]
/ A [25:21]
A [15:11]
Non-multiplexed Address
Output
Low
SDIBA [3:0]
/ A [12:9]
A [19:16]
Non-multiplexed Address
Output
Low
DQM3
DQM3
Data Qualifier Mask byte 3 (D [31:24])
Output
Low
DQM2
DQM2
Data Qualifier Mask byte 2 (D [23:16])
Output
Low
DQM1
DQM1
Data Qualifier Mask byte 1 (D [15:8])
Output
Low
DQM0
DQM0
Data Qualifier Mask byte 0 (D [7:0])
Output
Low
DQ[31:0]
D[31:0]
Data bus
I/O
High
SDWE
SDWE
Write Enable
Output
High
RAS
RAS
Row Address Strobe
Output
High
CAS
CAS
Column Address Strobe
Output
High
RESET_SF
RESET_SF
SyncFlash Reset/Powerdown
Output
Low
Table 24-2. SDRAM Interface Pin Characteristics (Continued)
SDRAMC
Signal
Name
MC9328MX1
Pin Name
Function
Direction
Reset State
Summary of Contents for DragonBall MC9328MX1
Page 68: ...1 12 MC9328MX1 Reference Manual MOTOROLA Introduction ...
Page 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
Page 116: ...3 30 MC9328MX1 Reference Manual MOTOROLA Memory Map ...
Page 126: ...4 10 MC9328MX1 Reference Manual MOTOROLA ARM920T Processor ...
Page 160: ...8 8 MC9328MX1 Reference Manual MOTOROLA System Control ...
Page 272: ...13 32 MC9328MX1 Reference Manual MOTOROLA DMA Controller ...
Page 281: ...Programming Model MOTOROLA Watchdog Timer Module 14 9 ...
Page 282: ...14 10 MC9328MX1 Reference Manual MOTOROLA Watchdog Timer Module ...
Page 300: ...15 18 MC9328MX1 Reference Manual MOTOROLA Analog Signal Processor ASP ...
Page 438: ...18 16 MC9328MX1 Reference Manual MOTOROLA Serial Peripheral Interface Modules SPI 1 and SPI 2 ...
Page 478: ...19 40 MC9328MX1 Reference Manual MOTOROLA LCD Controller ...
Page 574: ...21 32 MC9328MX1 Reference Manual MOTOROLA Memory Stick Host Controller MSHC Module ...
Page 598: ...23 16 MC9328MX1 Reference Manual MOTOROLA Real Time Clock RTC ...
Page 670: ...24 72 MC9328MX1 Reference Manual MOTOROLA SDRAM Memory Controller ...
Page 726: ...25 56 MC9328MX1 Reference Manual MOTOROLA SmartCard Interface Module SIM ...
Page 736: ...26 10 MC9328MX1 Reference Manual MOTOROLA General Purpose Timers ...
Page 854: ...29 18 MC9328MX1 Reference Manual MOTOROLA I2C Module ...
Page 900: ...30 46 MC9328MX1 Reference Manual MOTOROLA Synchronous Serial Interface SSI ...
Page 942: ...32 26 MC9328MX1 Reference Manual MOTOROLA GPIO Module and I O Multiplexer IOMUX ...