Features
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor 8-3
2 bits of bank address (BA[1:0])
NOTE
In this document the Auto Precharge control signal (A10 usually), conveyed on the memory address
bus along with column address, is never included in the stated CA width; it is always in addition to
the CA width.
The Memory Controller does not support memory devices with >9 CA bits, but <13 RA bits.
RA[12:0] correspond directly with MEM_MA[12:0]. CA[7:0] correspond directly with
MEM_MA[7:0]. CA[11:8] do not correspond directly with MEM_MA[12:8].
Maximum of 2 pinned-out Chip Selects (CS).
—CS0
is pinned out all the time (i.e., a dedicated pin).
—CS1 is only available if the GPIO_WKUP6 pin is programmed to be an SDRAM chip select. The default function of the pin
is GPIO_WKUP6.
To configure the GPIO_WKUP6 pin as SDRAM chip select, write 1 to the Port Configuration register msb.Section 7.3.2.1.1,
GPS Port Configuration Register—MBAR + 0x0B00
NOTE
The GPIO_WKUP_6 pin, which can be programmed as CS1 for the SDRAM bus, is powered by the
Memory Vdd supply. When using Single Data Rate SDRAMS, the Memory Vdd supply is 3.3 volts.
When using Double Data Rate SDRAMs, the Memory Vdd supply is 2.5 volts.
If GPIO_WKUP_6 is used as a GPIO pin (as opposed to CS1), the input levels must be appropriate
for the voltage on the Memory Vdd supply. For instance, if DDR memory is used which requires a
Vdd_mem supply of 2.5 volts, then logic levels applied to GPIO_WKUP_6 must not exceed 2.5 volts.
The size of each CS space is independent. It is possible but not recommended to overlap the address space pointed to by the 2
independent chip select.
NOTE
Maximum 4 physical memory devices total, all CS.
Minimum allocatable address space 1MB:
8 bits of row address;
8 bits of column address for 32-bit interface, 9 bits of column address for 16-bit interface;
2 bits of bank address;
—1 chip select;
NOTE
Minimum allocatable address space is much smaller (8Mb) than the lowest density available (64Mb).
Excess memory bits are not used or simply wasted.
32 Byte PowerPC e300 critical word first burst transfer;
Supports PowerPC e300 bus, 2-stage address/data pipeline (one data tenure in progress, one pipelined address tenure);
Supports SDRAM Power Down and Self Refresh modes;
Supports page mode and bursting to maximize the data rate;
NOTE
The SDRAM Memory Controller (MC) does not support error detect or parity check.
8.3.1 Devices Supported
Supported SDRAM devices (SDR and DDR both) are:
• 64Mbit;
• 128Mbit;
• 256Mbit;
• 512Mbit;
1Gbit when available, assuming the same interface style;
2Gbit when available, assuming the same interface style;
The MPC5200B limits external memory to a maximum of 4 memory chips placed within 5 cm of the MPC5200B processor. Flight delay on
the board should be no more than 0.5 ns each way, and all signals must be matched. The maximum load is 20pF/pin.