MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 346

• 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

DDR Memory Controller
9-22
17–23
24–25
Bits
14
15
16
26
27
28
29
BA_INTLV_CTL
x32_EN
PCHB8
2T_EN
NCAP
Name
HSE
—
—
—
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
Table 9-12. DDR_SDRAM_CFG Field Descriptions (continued)
precharge. If one of these devices is used, then this bit will need to be set if auto precharge is used.
0 DRAMs in system support concurrent auto-precharge.
1 DRAMs in system do not support concurrent auto-precharge.
Reserved
Enable 2T timing.
0 1T timing is enabled. The DRAM command/address are held for only 1 cycle on the DRAM bus.
1 2T timing is enabled. The DRAM command/address are held for 2 full cycles on the DRAM bus
Note that RD_EN and 2T_EN must not both be set at the same time.
(‘ x ’ denotes a don’t care bit value. All unlisted field values are reserved.)
0000000 No external memory banks are interleaved
1000000 External memory banks 0 and 1 are interleaved
0100000 External memory banks 2 and 3 are interleaved
1100000 External memory banks 0 and 1 are interleaved together and
xx 00100 External memory banks 0 through 3 are all interleaved together
Reserved
0 Either x8 or x16 discrete DRAM chips are used. In this mode, each data byte has a dedicated
1 x32 discrete DRAM chips are used. In this mode, DQS0 will be used to capture DQ[0:31], DQS4
0 MA[10] will be used to indicate the auto-precharge and precharge all commands.
1 MA[8] will be used to indicate the auto-precharge and precharge all commands.
If x32_EN is cleared, then PCHB8 should be cleared as well.
Sets I/O driver impedance to half strength. This impedance will be used by the MDIC,
address/command, data, and clock impedance values, but only if automatic hardware calibration is
disabled and the corresponding group's software override is disabled in the DDR control driver
register(s) described in
0 I/O driver impedance will be configured to full strength.
1 I/O driver impedance will be configured to half strength.
Reserved
Non-concurrent auto-precharge. Some older DDR DRAMs do not support concurrent auto
Bank (chip select) interleaving control. Set this field only if you wish to use bank interleaving.
x32 enable.
Precharge bit 8 enable.
Global half-strength override
for every DRAM transaction. However, the chip select is only held for the second cycle.
corresponding data strobe.
will be used to capture DQ[32:63] and DQS8 will be used to capture ECC[0:7].
banks 2 and 3 are interleaved together
Section 19.4.1.21, “DDR Control Driver Register (DDRCDR).”
Description
S
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