mc94mx21 Freescale Semiconductor, Inc, mc94mx21 Datasheet - Page 38

• Manufacturer Part Number: mc94mx21
• Description: 333 And 350 Mhz
• Manufacturer: Freescale Semiconductor, Inc

Specifications
Figure 29
data transfer starts after N
for transmission errors. The card sends back the CRC check result as a CC status token on the data line. If
there was a transmission error, the card sends a negative CRC status (101); otherwise, a positive CRC
status (010) is returned. The card expects a continuous flow of data blocks if it is configured to multiple
block mode, with the flow terminated by a stop transmission command.
38
CMD
DAT
shows the basic write operation timing. As with the read operation, after the card response, the
S T
Host Command
Content
Z****Z
CMD
DAT
CMD
DAT
WR
CRC
S T
S T
D D D D
cycles. The data is suffixed with CRC check bits to allow the card to check
E Z Z P
Figure 28. Timing Diagrams at Data Read
Host Command
Host Command
Valid Read Data
Z Z P
Content
Content
N
CR
Z****Z
N
AC
MC94MX21 Technical Data, Rev. 1.4
*****
cycles
******
cycles
******
N
ST
CRC
CRC
P S T
D D D D
P S D
E Z Z P
E Z Z P
Z Z P
N
N
N
E
Content
AC
CR
CR
Response
D D D
Z
Read Data
cycles
Z
cycles
******
******
cycles
******
Z
P S T
P S D
P S T
*****
CRC E Z
Timing of stop command
(CMD12, data transfer mode)
Timing of single block read
D D D
Content
Content
P
Read Data
Response
Response
*****
N
AC
*****
cycles
*****
CRC E Z
Timing of multiple block read
CRC E Z
P S D D D D
Freescale Semiconductor
Read Data
*****