參數(shù)資料
型號(hào)： MX53L06402L-50
廠商： MACRONIX INTERNATIONAL CO LTD
元件分類： PROM
英文描述： FLASH 2.7V PROM CARD, XMA7
封裝： CRAD-7
文件頁(yè)數(shù)： 8/55頁(yè)
文件大小： 262K
代理商： MX53L06402L-50
16
P/N: PM1043
REV. 1.0, NOV. 25, 2003
MX53L06402
6.3 Operating voltage range validation
The MultiMediaCard standards operating range validation is intended to support reduced voltage range MultiMediaCards.
The MX53L06402 supports the full range of 2.7 to 3.6V supply voltage. So the MX53L06402 sends a R3 response
to CMD1 which contains an OCR value of 0x00FF8000 (see "Chapter 6.5: Responses").
6.4 Data transfer mode
When in Standby State, both CMD and DAT lines are in the push-pull mode. As long as the content of all CSD registers
is not known, the f
PushPull clock rate is equal to the slow f OpenDrain clock rate. SEND_CSD (CMD9) allows the host to get
the Card Specific Data (CSD register), e.g. ECC type, block length, card storage capacity, maximum clock rate etc.
The host starts the card identification process in open drain mode with the identification clock rate f
OD (generated by
a push pull driver stage). The open drain driver stages on the CMD line allow the parallel card operation during card
identification.
After the bus is activated the host will request the cards to send their valid operation conditions with the command
SEND_OP_COND(CMD1). Since the bus is in open drain mode, as long as there is more than one card with operating
conditions restrictions, the host gets in the response to the CMD1 a "Wired or" operation condition restrictions of those
cards. The host then must pick a common denominator for operation and notify the application that cards with out of
range parameters (from the host perspective) are connected to the bus. Incompatible cards go into Inactive State.
After an operating mode is established, the host asks all cards for their unique card identification (CID) number with
the broadcast command ALL_SEND_CID (CMD2). All not already identified cards (i.e. those which are in Ready State)
simultaneously start sending their CID numbers serially, while bit-wise monitoring their outgoing bit stream. Those
cards, whose outgoing CID bits do not match the corresponding bits on the command line in any one of the bit periods,
stop sending their CID immediately and must wait for the next identification cycle (cards stay in the Ready State).
There should be only one card which successfully sends its full CID-number to the host. This card then goes into the
Identification State. The host assigns to this card (using CMD3, SET_RELATIVE_ADDR) a relative card address
(RCA, shorter than CID), which will be used to address the card in future communication (faster than with the CID).
Once the RCA is received the card transfers to the Standby State and does not react to further identification cycles.
The card also switches the output drivers from the open-drain to the push-pull mode in this state.
The host repeats the identification process as long as it receives a response (CID) to its identifica-tion command
(CMD2). When no card responds to this command, all cards have been identified. The time-out condition to recognize
this, is waiting for the start bit for more than 5 clock periods after sending CMD2.
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