Cinterion
®
ELS31-VA/ELS51-VA Hardware Interface Description
2.1 Application Interface
56
ELS31-VA_ELS51-VA_HID_v01.000
2017-01-04
Confidential / Preliminary
Page 40 of 106
lists the six SDIO interface lines:
illustrates the SDIO timings for data input and output, whereas the below
gives the actual timing values for the various speed modes.
Figure 17:
SDIO interface timing diagrams (Input/Output)
Table 9:
SDIO interface lines
Signal
Direction
Description
SDIOCLK
Out
SD master clock output to SD/MMC/SDIO device.
SDIOCMD
I/O
Command line.
SDIO0
I/O
Data lines. Only SDIO0 carries data in 1-bit SD mode,
SDIO0..3 carry data in 4-bits mode.
SDIO interrupt is multiplexed with SDIO1.
SDIO1
I/O
SDIO2
I/O
SDIO3
I/O
Table 10:
SDIO timings
Mode
Parameter
Minimum
Maximum
Normal
speed
T
ISU
Input set-up time
5ns
T
IH
Input hold time
5ns
T
ODL
Output delay time during Date Transfer Mode
0ns
14ns
T
ODL
Output delay time during Identification Mode
0ns
50ns