External Interface
MOTOROLA
SDRAM Memory Controller
24-7
24.4.10 CAS—Column Address Strobe
The column address strobe is the third signal comprised in the command field. It generally signifies a
column oriented command. When CAS is asserted (low), the column address has changed. Table 24-51 on
page 24-69 provides details on SDRAM command encoding.
24.4.11 RESET_SF—Reset or Powerdown
This output signal is only used for SyncFlash memories. When asserted low, the SyncFlash memory state
machines are reset and the device is placed in the lowest power operating mode. Bringing this signal high
returns the device to a normal operating condition, ready to accept commands following a stabilization
delay.
Three conditions force the RESET_SF pin to be asserted: SDRAM reset (SD_RST), disabling the
chip-select via the SDE bit in the SDCTL1 control register, and entering one of the low-power modes. In
each case, the system integrator must guarantee that the SyncFlash stabilization period between
RESET_SF negation and the first access to the device has been met.
NOTE:
Programming hardware-protected blocks within the SyncFlash requires
RESET_SF to be raised to 5V +/-10%. This feature is not supported by the
SDRAM Controller.
24.4.12 Pin Configuration for SDRAMC
Table 24-2 lists the pins used for the SDRAM controller. These pins are multiplexed with other functions
on the device, and must be configured for SDRAM operation.
NOTE:
The user must ensure that the data direction bits in the GPIO are set to the
correct direction for proper operation. See Section 32.5.1, “Data Direction
Registers,” on page 32-9 for details.
Table 24-4. Pin Configuration
Pin
Setting
Set-Up Procedure
SDCLK
Not multiplexed
SDCKE0
Not multiplexed
SDCKE1
Not multiplexed
CSD0
Alternate function of CS2/CSD0
pin
Set bit 0 (SDCS0_SEL) in the Function Multiplexing Control
register of the System Control module.
CSD1
Alternate function of CS3/CSD1
pin
Set bit 1 (SDCS1_SEL) in the Function Multiplexing Control
register of the System Control module.
MA [11:10]
Not multiplexed
MA [9:0]
Multiplexed with
A [10:1]
Internal signal from SDRAMC, asserted for SDRAM accesses
Содержание DragonBall MC9328MX1
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Страница 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
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