- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄382301 > MC4GH02GNMCA-2SA00 (SAMSUNG SEMICONDUCTOR CO. LTD.) SAMSUNG MultiMediaCard PDF資料下載
參數(shù)資料
| 型號： | MC4GH02GNMCA-2SA00 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | SAMSUNG MultiMediaCard |
| 中文描述： | 三星多媒體 |
| 文件頁數(shù)： | 54/102頁 |
| 文件大?。?/td> | 1384K |
| 代理商： | MC4GH02GNMCA-2SA00 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁當(dāng)前第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁
MultiMediaCard
TM
54
Sep.22.2005
Revision 0.3
6.3 Clock Control
The MultiMediaCard bus clock signal can be used by the host to put the card into energy saving mode, or to control the
data flow (to avoid under-run or over-run conditions) on the bus. The host is allowed to lower the clock frequency or shut it
down.
There are a few restrictions the host must follow:
The bus frequency can be changed at any time (under the restrictions of maximum data transfer frequency, defined by
the card, and the identification frequency defined by the specification document).
It is an obvious requirement that the clock must be running for the card to output data or response tokens. After the
last MultiMediaCard bus transaction, the host is required, to provide
8 (eight)
clock cycles for the card to complete the
operation before shutting down the clock. Following is a list of the various bus transactions:
A command with no response. 8 clocks after the host command end bit.
A command with response. 8 clocks after the card response end bit.
A read data transaction. 8 clocks after the end bit of the last data block.
A write data transaction. 8 clocks after the CRC status token.
The host is allowed to shut down the clock of a “busy” card. The card will complete the programming operation
regardless of the host clock. However, the host must provide a clock edge for the card to turn off its busy signal.
Without a clock edge the card (unless previously disconnected by a deselect command -CMD7) will force the DAT0
line down, forever.
6.4 Cyclic Redundancy Codes (CRC)
The CRC is intended for protecting MultiMediaCard commands, responses and data transfer against transmission errors
on the MultiMediaCard bus. One CRC is generated for every command and checked for every response on the CMD line.
For data blocks one CRC per transferred block, per data line, is generated. The CRC is generated and checked as
described in the following.
CRC7
The CRC7 check is used for all commands, for all responses except type R3, and for the CSD and CID registers. The
CRC7 is a 7-bit value and is computed as follows:
x
7
x
3
+
+
=
x
n
second bit
(
)
×
+
×
=
x
7
(
)
G x
[
=
Generator polynomial
All CRC registers are initialized to zero. The first bit is the most left bit of the corresponding bit string (of the command,
response, CID or CSD). The degree
n
of the polynomial is the number of CRC protected bits decreased by one. The num-
ber of bits to be protected is 40 for commands and responses (n = 39), and 120 for the CSD and CID (n = 119).
Figure 6-3 : CRC7 Generator/Checker
G x
1
x
n
M x
first bit
(
)
1
–
…
last bit
(
)
x
0
×
+
+
CRC
6
…
0
[
]
Remainder
M x
]
data in
data out
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC206 | THIN SMD LOW/MEDIUM-FREQUENCY CRYSTAL UNIT |
| MC2300 | Navigator Motion Processor |
| MC26LS30 | Dual Differential Quad Single-Ended (EIA-423-A) Line Drivers |
| MC26LS30D | CABLE GLAND, PG29 |
| MC26LS30DR2 | Dual Differential Quad Single-Ended (EIA-423-A) Line Drivers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC4M | 制造商:G & J HALL 功能描述:STEP DRILL MULTICUT 4-12MM X 2MM 制造商:G & J HALL 功能描述:STEP DRILL, MULTICUT, 4-12MM X 2MM |
| MC-4-MALE | 制造商:Multi-Contact USA 功能描述: |
| MC4MANUAL | 制造商:Omron Corporation 功能描述: |
| MC-4R128CEE6B | 制造商:NEC 制造商全稱:NEC 功能描述:Direct Rambus DRAM RIMM Module 128M-BYTE 64M-WORD x 16-BIT |
| MC-4R128CEE6B-653 | 制造商:NEC 制造商全稱:NEC 功能描述:Direct Rambus DRAM RIMM Module 128M-BYTE 64M-WORD x 16-BIT |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。