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參數(shù)資料
| 型號(hào)： | romr0002 |
| 廠商： | SIEMENS AG |
| 英文描述： | MultiMediaCard R0002 2 Mbyte ROM(多媒體卡 R0002 2 Mbyte ROM) |
| 中文描述： | 多媒體R0002 2字節(jié)的光盤（多媒體卡R0002 2字節(jié)光盤） |
| 文件頁數(shù)： | 20/41頁 |
| 文件大?。?/td> | 207K |
| 代理商： | ROMR0002 |
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Siemens
Product Manual R0002
Semiconductor Group
20
3.1
The broadcast command SET_DSR (CMD4) configures the driver stages of all identified cards. It
programs their DSR registers corresponding to the application bus layout (length) and the number of
cards on the bus and the data transfer frequency. The clock rate is also switched from f
OD
to f
PP
at
that point.
The command SELECT_DESELECT_CARD (CMD7) is used to select one card and place it in the
Transfer State If a previously selected card is in the Transfer Stateits connection with the host is
released and it will move back to the Stand-by State. Only one card can be, at any time, in the
Transfer State.A selected card is responding the CMD7, the deselected one does not respond to
this command.
When CMD7 is sent including the reserved relative card address “0x0000”, all cards transfer back to
Stand-by State
. This command is used to identify new cards without resetting other already
acquired cards. Cards to which an RCA has already been assigned, do not respond to the identifi-
cation command flow in this state.
All the data communication in the Data Transfer Mode is consequently a point-to point communica-
tion between the host and the selected card (using addressed commands). All addressed com-
mands are acknowledged by a response on the CMD line.
All read commands (data is sent from the card via data lines) can be interrupted at any time, by a
stop command.
The DAT bus line value is ‘1’ when no data is transmitted. A transmitted data block consists of a
start bit (LOW), followed by a continuous data stream. The data stream contains the net payload
data (and error correction bits if an off-card ECC is used). The data stream ends with an end bit
(HIGH). The data transmission is synchronous to the clock signal.
The payload for block oriented data transfer is protected by a CRC check sum (see "Chapter 7:
Error handling").
Stream read
There is a stream oriented data transfer controlled by READ_DAT_UNTIL_STOP (CMD11). This
command instructs the card to send its payload, starting at a specified address, until the host sends
a STOP_TRANSMISSION command (CMD12). Please note that the host stop command has an
execution delay due to the serial command transmission. The data transfer stops after the end bit of
the next command with interrupt ability.
If the end of the memory range is reached while sending data and no stop command has yet been
sent by the host, the data transfer will continued. The data sent than is undefined. The host has to
observe the boundaries of the memory range.
Block read
Block read is similar to stream read, except the basic unit of data transfer is a block whose maxi-
mum size is defined in the CSD (READ_BLK_LEN). READ_BLK_PARTIAL is set, thus smaller
blocks whose starting and ending address are wholly contained within one physical block (as
defined by READ_BLK_LEN) may also be transmitted. Unlike stream read, a CRC is appended to
the end of each block ensuring data transfer integrity. READ_SINGLE_BLOCK (CMD17) starts a
block read and after a complete transfer the card goes back to Transfer State
READ_MULTIPLE_BLOCK (CMD18) starts a transfer of several consecutive blocks. Blocks will be
continuously transferred until a stop command is issued. Block misalignment is also allowed for the
R0002.
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