參數(shù)資料
型號： TMS320DM355_07
廠商： Texas Instruments, Inc.
英文描述： Digital Media System-on-Chip (DMSoC)
中文描述： 數(shù)字媒體系統(tǒng)芯片（DMSoC）
文件頁數(shù)： 113/158頁
文件大小： 1319K
代理商： TMS320DM355_07
www.ti.com
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5.8 MMC/SD
5.8.1
MMC/SD Electrical Data/Timing
TMS320DM355
Digital Media System-on-Chip (DMSoC)
SPRS463B–SEPTEMBER 2007–REVISED OCTOBER 2007
The DM355 includes two separate MMC/SD Controllers which are compliant with MMC V3.31, Secure
Digital Part 1 Physical Layer Specification V1.1 and Secure Digital Input Output (SDIO) V1.0
specifications.
The DM355 MMC/SD Controller has following features:
MultiMediaCard (MMC).
Secure Digital (SD) Memory Card.
MMC/SD protocol support.
SDIO protocol support.
Programmable clock frequency.
256 bit Read/Write FIFO to lower system overhead.
Slave EDMA transfer capability.
The DM355 MMC/SD Controller does not support SPI mode.
Table 5-15. Timing Requirements for MMC/SD Module
(see
Figure 5-20
and
Figure 5-22
)
DM355
NO.
FAST MODE
MIN
6
2.5
(1)
6
2.5
STANDARD MODE
MIN
5
5
5
5
UNIT
MAX
MAX
1
2
3
4
t
su(CMDV-CLKH)
t
h(CLKH-CMDV)
t
su(DATV-CLKH)
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
ns
ns
ns
ns
(1)
For this parameter, you may include margin in your board design so that the toh = 2.5 ns of the MMC/SD device is not degraded at the
DM355 input pin.
Table 5-16. Switching Characteristics Over Recommended Operating Conditions for MMC/SD Module
(see
Figure 5-19
through
Figure 5-22
)
DM355
STANDARD
MODE
MIN
NO.
PARAMETER
FAST MODE
UNIT
MIN
MAX
MAX
7
8
9
f
(CLK)
f
(CLK_ID)
t
W(CLKL)
t
W(CLKH)
t
r(CLK)
t
f(CLK)
t
d(CLKL-
CMD)
t
d(CLKL-DAT)
Operating frequency, SD_CLK
Identification mode frequency, SD_CLK
Pulse width, SD_CLK low
Pulse width, SD_CLK high
Rise time, SD_CLK
Fall time, SD_CLK
0
0
7
7
50
400
0
0
25
400
MHz
KHz
ns
ns
ns
ns
10
10
10
11
12
3
3
10
10
13
Delay time, SD_CLK low to SD_CMD transition
-7.5
4
-7.5
14
ns
14
Delay time, SD_CLK low to SD_DATx transition
-7.5
4
-7.5
14
ns
Submit Documentation Feedback
DM355 Peripheral Information and Electrical Specifications
113
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