MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 671

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Note that during normal operation (read/write), a full 32-bit address that includes row and column is
generated on LAD[0:31]. However, address/data signal multiplexing implies that the address must be
latched by an external latch that is controlled by LALE. All SDRAM device address signals need to be
connected to the latched address bits and burst address bits (LA[27:31]) of the LBC, with the exception of
A10, which has a dedicated connection on LSDA10. LSDA10 is driven with the appropriate row address
bit for SDRAM commands that require A10 to be an address.
14.4.3.7
The software is responsible for setting correct values for device-specific parameters that can be extracted
from the device’s data sheet. The values are stored in the ORn and LSDMR registers. These parameters
include the following:
In addition, the LBC hardware ensures a default activate to precharge interval of 10 bus cycles. The
following sections describe SDRAM parameters programmed in LSDMR.
Freescale Semiconductor
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Precharge to activate interval (LSDMR[PRETOACT])
Activate to read/write interval (LSDMR[ACTTORW])
CAS latency, column address to first data out (LSDMR[CL] and LCRR[ECL])
Write recovery, last data in to precharge (LSDMR[WRC])
Refresh recovery interval (LSDMR[RFRC])
External buffers on the control lines present (LSDMR[BUFCMD] and LCRR[BUFCMDC])
Activate Address (RAS):
R/W Address (CAS):
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
SDRAM Device-Specific Parameters
Logical Address:
Figure 14-35. SDRAM Address Multiplexing
0
msbs
Row
Row
BS
BS
A n
BS
—
Row
Column
Column
To memory
device signals,
except A10
Local Bus Controller
lsbs
lsbs
lsbs
31
14-51