TMS320DM6443 Datasheet, PDF (145/202 Pages) Texas Instruments – Digital Media System on-Chip

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5.12.2 MMC/SD Electrical Data/Timing
TMS320DM6443
Digital Media System on-Chip
SPRS282 – DECEMBER 2005
Table 5-39. Timing Requirements for MMC/SD Module
(see Figure 5-38 and Figure 5-40)
NO.
3 t_{su(DATV-CLKH)} Setup time, SD_DATx valid before SD_CLK high
4 t_h(CLKH-DATV) Hold time, SD_DATx valid after SD_CLK high
-594
FAST MODE
STANDARD MODE UNIT
MIN
MAX
MIN
MAX
6
5
ns
2.5
5
ns
Table 5-40. Switching Characteristics Over Recommended Operating Conditions for MMC/SD Module⁽¹⁾
(see Figure 5-37 through Figure 5-40)
NO.
PARAMETER
7 f_(CLK)
Operating frequency, SD_CLK
8 f_{(CLK_ID)} Indentification 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 ^td(CLKLL-
CMD)
Delay time, SD_CLK low to SD_CMD transition
14 ^tdis(CLKL-
DAT)
Disable time, SD_CLK low to SD_DATx transition
(1) P = Period of SD_CLK in nanoseconds (ns).
SD_CLK
SD_CMD
9
7
10
13
13
START
XMIT
Valid
-594
FAST MODE
STANDARD
MODE
UNIT
MIN MAX
MIN MAX
0
50
0
25 MHz
0 400
0 400 KHz
7
10
ns
7
10
ns
3
10
3
10
-7.5
4
-7.5
14 ns
-7.5
4
-7.5
14 ns
13
13
Valid
Valid
END
Figure 5-37. MMC/SD Host Command Timing
SD_CLK
7
9
10
SD_CMD
START
XMIT
Valid
Valid
Valid
END
Figure 5-38. MMC/SD Card Response Timing
Peripheral and Electrical Specifications 145