24-24
MC9328MX1 Reference Manual
MOTOROLA
SDRAM Memory Controller
whether a single bank, or all banks, are precharged by the command. (See Figure 24-18). Accessing an
address with the SDRAM address A10 low will precharge only the bank selected by the bank address.
Conversely, accesses with A10 high will precharge all banks regardless of the bank address. Note that A10
is the SDRAM pin, not the ARM920T processor’s address. Translation of the SDRAM A10 address bit to
the corresponding ARM920T processor’s address is dependent on the memory configuration. The
precharge command access is two clocks in length on the AHB, and one cycle to the SDRAM controller.
Figure 24-18. Precharge Bank Timing Diagram
Figure 24-19. Precharge All Timing Diagram
24.6.4 Auto-Refresh Mode (SMODE = 010)
The Auto-Refresh Mode (SMODE = 010) is used to manually request SDRAM refresh cycles. It is
normally used only during device initialization because the SDRAM Controller will automatically
generate refresh cycles when properly configured. The auto-refresh command refreshes all banks in the
device, so the address supplied during the refresh command only needs to specify the correct SDRAM
device. The lower address lines are ignored. Either a read or write cycle may be used. If a write is used, the
data will be ignored and the external data bus will not be driven. The cycle will be 2 clocks on the AHB
and a single clock to the SDRAM device.
RAS,
CAS,
SDWE
CSDx
DATA
ADDR
PRE
NOP
NOP
NOP
ACT
t
RP
Min applies only to same bank.
SDRAMx,
with A10-0
SDRAMx
Row
SDCLK
SDCLK
RAS,
CAS,
SDWE
CSDx
DATA
ADDR
PRE
NOP
NOP
NOP
ACT
t
RP
Min
SDRAMx
with A10 = 1
SDRAMx
Row
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 ...