User's Manual

Cinterion
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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
Table 9 lists the six SDIO interface lines:
Figure 17 illustrates the SDIO timings for data input and output, whereas the below Table 10
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