TMS320DM6446_07 Datasheet, PDF (157/231 Pages) Texas Instruments – Digital Media System-on-Chip

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6.12.2 MMC/SD/SDIO Electrical Data/Timing
TMS320DM6446
Digital Media System-on-Chip
SPRS283E – DECEMBER 2005 – REVISED MARCH 2007
Table 6-44. Timing Requirements for MMC/SD/SDIO Module
(see Figure 6-43 and Figure 6-45)
NO.
1
t_{su(CMDV-CLKH)}
2
t_h(CLKH-CMDV)
3
t_{su(DATV-CLKH)}
4
t_h(CLKH-DATV)
Setup time, SD_CMD valid before SD_CLK high
Hold time, SD_CMD valid after SD_CLK high
Setup time, SD_DATx valid before SD_CLK high
Hold time, SD_DATx valid after SD_CLK high
-594
STANDARD MODE
MIN
MAX
5
5
5
5
UNIT
ns
ns
ns
ns
Table 6-45. Switching Characteristics Over Recommended Operating Conditions for MMC/SD/SDIO
Module⁽¹⁾ (see Figure 6-42 through Figure 6-45)
NO.
PARAMETER
7
f_(CLK)
Operating frequency, SD_CLK
8
f_{(CLK_ID)}
Identification mode frequency, SD_CLK
9
t_W(CLKL)
Pulse width, SD_CLK low
10
t_W(CLKH)
Pulse width, SD_CLK high
11
t_r(CLK)
Rise time, SD_CLK
12
t_f(CLK)
Fall time, SD_CLK
13
t_d(CLKLL-CMD)
Delay time, SD_CLK low to SD_CMD transition
14
t_{dis(CLKL-DAT)}
Disable time, SD_CLK low to SD_DATx transition
(1) P = Period of SD_CLK (SYSCLK5), in nanoseconds (ns).
SD_CLK
13
SD_CMD
9
7
10
13
START
XMIT
Valid
13
Valid
Valid
-594
STANDARD MODE
MIN
MAX
0
25
0
400
10
10
10
10
-7.5
13
-7.5
13
UNIT
MHz
KHz
ns
ns
ns
ns
ns
ns
13
END
Figure 6-42. MMC/SD/SDIO Host Command Timing
SD_CLK
SD_CMD
9
7
10
START
XMIT
1
Valid
2
Valid
Valid
END
Figure 6-43. MMC/SD/SDIO Card Response Timing
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Peripheral and Electrical Specifications 157