参数资料
型号: MK20N512VLQ100R
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 100 MHz, RISC MICROCONTROLLER, PQFP144
封装: 20 X 20 MM, LQFP-144
文件页数: 57/74页
文件大小: 1849K
代理商: MK20N512VLQ100R
6.8.9 SDHC specifications
The following timing specs are defined at the chip I/O pin and must be translated
appropriately to arrive at timing specs/constraints for the physical interface.
Table 41. SDHC switching specifications
Num
Symbol
Description
Min.
Max.
Unit
Operating voltage
2.7
3.6
V
Card input clock
SD1
fpp
Clock frequency (low speed)
0
400
kHz
fpp
Clock frequency (SD\SDIO full speed)
0
25
MHz
fpp
Clock frequency (MMC full speed)
0
20
MHz
fOD
Clock frequency (identification mode)
0
400
kHz
SD2
tWL
Clock low time
7
ns
SD3
tWH
Clock high time
7
ns
SD4
tTLH
Clock rise time
3
ns
SD5
tTHL
Clock fall time
3
ns
SDHC output / card inputs SDHC_CMD, SDHC_DAT (reference to SDHC_CLK)
SD6
tOD
SDHC output delay (output valid)
-5
6.5
ns
SDHC input / card inputs SDHC_CMD, SDHC_DAT (reference to SDHC_CLK)
SD7
tTHL
SDHC input setup time
5
ns
SD8
tTHL
SDHC input hold time
0
ns
SD2
SD3
SD1
SD6
SD8
SD7
SDHC_CLK
Output SDHC_CMD
Output SDHC_DAT[3:0]
Input SDHC_CMD
Input SDHC_DAT[3:0]
Figure 26. SDHC timing
Peripheral operating requirements and behaviors
K20 Sub-Family Data Sheet Data Sheet, Rev. 4, 3/2011.
60
Preliminary
Freescale Semiconductor, Inc.
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