Product manual

4-27 SanDisk miniSD Card Product Manual, Rev. 1.1 © 2003 SANDISK CORPORATION
R4 and R5: responses are not supported.
R6 (Published RCA response): code length 48-bit. The bits 45:40 indicate the index of the command to be
responded to—in that case it will be ‘000011’ (together with bit 5 in the status bits it means = CMD3). The 16 MSB
bits of the argument field are used for the published RCA number.
Table 4-29. R6 Response
Bit Position 47 46 [45:40] [39:8] Argument Field [7:1] 0
Width (bits) 1 1 6 16 16 7 1
Value ‘0’ ‘0’ x x x x ‘1’
Description start bit transmission bit Command
index
(‘000011’)
New published RCA
[31:16] of the card
[15:0] card status bits:
23,22,19,12:0
(see Table 4-28)
CRC7 end bit
4.11. Timings
All timing diagrams use the schematics and abbreviations listed in Table 4-31.
Table 4-31. Timing Diagram Symbols
S Start Bit (= 0)
T Transmitter Bit (Host = 1, Card = 0)
P One-cycle Pull-up (= 1)
E End Bit (=1)
Z High Impedance State (-> = 1)
D Data Bits
X Don’t Care Data Bits (from Card)
* Repeater
CRC Cyclic Redundancy Check Bits (7 Bits)
Card Active
Host Active
The difference between the P-bit and Z-bit is that a P-bit is actively driven to HIGH by the card respectively host
output driver, while Z-bit is driven to (respectively kept) HIGH by the pull-up resistors R
CMD
respectively R
DAT
.
Actively driven P-bits are less sensitive to noise. All timing values are defined in Table 4-33.