IAR-KSK-IMX25 Freescale Semiconductor, IAR-KSK-IMX25 Datasheet - Page 61

• Manufacturer Part Number: IAR-KSK-IMX25
• Description: KIT DEVELOPMENT I.MX257, ARM926
• Manufacturer: Freescale Semiconductor
• Series: i.MX25r
• Type: MCUr

Specifications of IAR-KSK-IMX25

• Contents: Board, Cables, CD, Debugger, Power Supply
• Processor To Be Evaluated: I.MX257
• Processor Series: i.MX25
• Data Bus Width: 16 bit
• Interface Type: UART, JTAG, USB, Ethernet, SD/MMC
• Core: ARM926EJ-S
• Silicon Manufacturer: Freescale
• Core Architecture: ARM
• Core Sub-architecture: ARM9
• Silicon Core Number: I.MX2
• Silicon Family Name: I.MX25
• Mcu Supported Families: I.MX25
• For Use With/related Products: i.MX25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1
Freescale Semiconductor
SD10 and SD11 are determined by SDRAM controller register settings.
SD10
SD11
SD1
SD2
SD3
SD6
SD7
ID
SDCLK
CAS
CKE
ADDR
RAS
WE
CS
SDRAM clock high-level width
SDRAM clock low-level width
SDRAM clock cycle time
Address setup time
Address hold time
Precharge cycle period
Auto precharge command period
The clock continues to run unless CKE is low. Then the clock is stopped in
low state.
Don’t care
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 8
BA
Figure 28. SDRAM Self-Refresh Cycle Timing Diagram
Parameter
Table 46. SDRAM Refresh Timing Parameters
1
SD16
1
NOTE
Symbol
tCH
tRC
tCK
tAS
tAH
tRP
tCL
SD16
Min.
3.4
3.4
7.5
1.8
1.8
1
2
Max.
4.1
4.1
20
—
—
—
4
clock
clock
Unit
ns
ns
ns
ns
ns
61