SMS02GDFB5E NUMONYX, SMS02GDFB5E Datasheet - Page 23

• Manufacturer Part Number: SMS02GDFB5E
• Description: MICROSD CARD SMS 2GB FLASH MEM
• Manufacturer: NUMONYX

Specifications of SMS02GDFB5E

• Memory Size: 2GB
• Memory Type: SD (Secure Digital)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SMSxxxDF
3.5
Table 11.
3.6
Bit position
Description
Width
Value
Commands
Four types of commands are used to control the SD memory card:
1.
2.
3.
4.
All commands have a fixed code length of 48 bits for a transmission time of 1.92 µs at
25 MHz and 0.96 µs at 50 MHz. All commands and responses are sent over the CMD line of
the SD memory card. Command transmission always starts with the most significant bit
(MSB) of the command codeword. All commands are protected by a CRC. All command
codewords are terminated by the end bit (always '1').
All commands and their arguments are specified in the SD memory card specification.
SD card command format
Responses
All responses are sent via the command line CMD. Response transmission always starts
with the leftmost bit of the response codeword. The code length depends on the response
type. A response always starts with a start bit (always '0'), followed by the bit indicating the
direction of transmission (from card = '0').
A value denoted by 'X' in
entry.
All responses (except for R3 responses) are protected by a CRC. All response codewords
are terminated by the end bit (always '1').
There are six types of responses. Their formats are defined as follows:
1.
Broadcast commands (bc), no response: the broadcast feature is available only if all
the CMD lines are interconnected at the level of the host. If they are not interconnected
then each individual card will accept the command in turn
Broadcast commands with response (bcr): since there is no open drain mode in SD
memory cards, this type of command is used only if the host does not use a common
CMD line. The command is accepted by every individual card and the responses from
all cards are sent simultaneously
Addressed (point-to-point) commands (ac): there is no data transfer on DAT.
Addressed (point-to-point) data transfer commands (adtc): there is a data transfer
on DAT.
R1 (normal response command): the code length is 48 bits. Bits 45 to 40 indicate the
index of the command to respond to. The index is a binary coded number (between 0
and 63). The status of the card is coded in 32 bits (see
Note that if data transfer to the card takes place, then a busy signal may appear on the
data line after the transmission of each block of data. The host has to check for busy
after data block transmission
Start bit
47
‘0’
1
Transmission
46
‘1’
bit
1
Table
12,
Command
Table
45:40
index
6
x
13,
Table 14
Argument
Secure digital memory card interface
39:8
32
Table 11
x
and
Table 15
Table
shows the command format.
12).
CRC7
7:1
indicates a variable
7
x
End bit
'1'
0
1
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