參數資料
型號: MCIMX31
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: Multimedia Applications Processors
中文描述: 多媒體應用處理器
文件頁數: 137/170頁
文件大?。?/td> 1562K
代理商: MCIMX31
Electrical Characteristics
i.MX31/i.MX31L Advance Information, Rev. 1.4
Freescale Semiconductor
137
Preliminary
4.3.19
SDHC Electrical Specifications
This section describes the electrical information of the SDHC.
4.3.19.1
SDHC Timing
Figure 74
depicts the timings of the SDHC, and
Table 57
lists the timing parameters.
Figure 74. SDHC Timing Diagram
.
Table 57. SDHC Interface Timing Parameters
ID
Parameter
Symbol
Min
Max
Unit
Card Input Clock
SD1
Clock Frequency (Low Speed)
f
PP1
f
PP2
f
PP3
f
OD4
0
400
kHz
Clock Frequency (SD/SDIO Full Speed)
0
25
MHz
Clock Frequency (MMC Full Speed)
0
20
MHz
Clock Frequency (Identification Mode)
100
400
kHz
SD2
Clock Low Time
t
WL
10
ns
SD3
Clock High Time
t
WH
10
ns
SD4
Clock Rise Time
t
TLH
10
ns
SD5
Clock Fall Time
t
THL
10
ns
SDHC output / Card Inputs CMD, DAT (Reference to CLK)
SD6
SDHC output / Card input Set-up Time
t
ISU
5
ns
SD7
SDHC output / Card input Hold Time
t
IH
5
ns
SD1
SD3
SD5
SD7
SD4
SD8
MMCx_CLK
MMCx_CLK
MMCx_CMD
MMCx_DAT_0
output from SDHC to card
MMCx_DAT_1
MMCx_DAT_2
MMCx_DAT_3
MMCx_CMD
MMCx_DAT_0
input from card to SDHC
MMCx_DAT_1
MMCx_DAT_2
MMCx_DAT_3
SD2
SD6
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