MCF5272VF66 Freescale, MCF5272VF66 Datasheet - Page 200

• Manufacturer Part Number: MCF5272VF66
• Manufacturer: Freescale

Specifications of MCF5272VF66

• Family Name: MCF5xxx
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 66MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 3.3V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 196
• Package Type: MA-BGA
• Lead Free Status / RoHS Status: Not Compliant

SDRAM Controller
To wake up the SDRAMs, SDCR[GSL] must be cleared. SDCR[SLEEP] remains set while the SDRAM
is exiting sleep mode and is cleared when the SDRAM completes the correct sequence to exit sleep mode.
9.8
The maximum performance of the SDRAM controller is determined by the required number of cycles for
page activation and precharge. The read access is influenced by the CAS latency. All SDRAM accesses
are in page mode. The following table shows the number of required cycles including all dead cycles for
each type of read/write SDRAM access. It assumes default timing configuration using an at least
PC100-compliant SDRAM device at 66 MHz. Page miss latency includes the cycles to precharge the last
open page and activate the new page before the read/write access. There are no precharge cycles when an
address hits an open page.
In
CLT = 1.
In
9-10
Table
Table
Single-beat read
Single-beat write
Burst read
Burst write
Table 9-9. SDRAM Controller Performance, 32-Bit Port, (RCD = 0, RP = 1) or (RCD = 1, RP = 0)
9-9, the timing configuration is RTP = 61, RC = negligible, RCD = 0 (or 1), RP = 1 (or 0), and
9-10, the timing configuration is RTP = 61, RC = negligible, RCD = 0, RP = 0, and CLT = 1.
Performance
Single-beat read
Single-beat write
Burst read
Burst write
Table 9-10. SDRAM Controller Performance, 32–Bit Port, (RCD = 0, RP = 0)
SDRAM Access
MCF5272 ColdFire
SDRAM Access
Page miss
Page hit
Page miss
Page hit
Page miss
Page hit
Page miss
Page hit
®
Page miss
Page hit
Page miss
Page hit
Page miss
Page hit
Page miss
Page hit
Integrated Microprocessor User’s Manual, Rev. 3
8
5
6
3
8-1-1-1 = 11
5-1-1-1 = 8
6-1-1-1 = 9
3-1-1-1 = 6
REG = 0, INV = 0
REG = 0, INV = 0
Number of System Clock Cycles
7-1-1-1 = 10
5-1-1-1 = 8
5-1-1-1 = 8
3-1-1-1 = 6
Number of System Clock Cycles
7
5
5
3
9
6
6
3
9-1-1-1 = 12
6-1-1-1 = 9
6-1-1-1 = 9
3-1-1-1 = 6
REG = 1, INV = 0
REG = 1, INV = 0
8-1-1-1 = 11
5-1-1-1 = 8
6-1-1-1 = 9
3-1-1-1 = 6
Freescale Semiconductor
8
6
5
3