PRELIMINARY
CYW54907
SDIO Pins
Table 7. SDIO Pin Descriptions
SD 4-Bit Mode
SD 1-Bit Mode
DATA0
DATA1
DATA2
DATA3
CLK
Data line 0
DATA
Data line
Interrupt
Data line 1 or Interrupt
Data line 2 or Read Wait
Data line 3
IRQ
RW
Read Wait
Not used
Clock
N/C
CLK
CMD
Clock
CMD
Command line
Command line
Figure 6. Signal Connections to an SDIO Host (SD 4-Bit Mode)
CLK
CMD
CYW54907
SD Host
DAT[3:0]
Figure 7. Signal Connections to an SDIO Host (SD 1-Bit Mode)
CLK
CMD
DATA
IRQ
CYW54907
SD Host
RW
Note: Per Section 6 of the SDIO specification, pull-ups in the 10 kΩ to 100 kΩ range are required on the four data (DATA) lines and
the command (CMD) line. This requirement must be met during all operating states either through the use of external pull-up
resistors or through proper programming of the SDIO host’s internal pull-ups
Document Number: 002-19312 Rev. *C
Page 19 of 95
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