BCM43907 Preliminary Data Sheet
SDIO 3.0
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
Data line 1 or Interrupt IRQ
Data line 2 or Read Wait RW
Interrupt
Read Wait
Not used
Clock
Data line 3
Clock
N/C
CLK
CMD
Command line
CMD Command line
Figure 7: Signal Connections to an SDIO Host (SD 4-Bit Mode)
CLK
CMD
BCM43907
SD Host
DAT[3:0]
Figure 8: Signal Connections to an SDIO Host (SD 1-Bit Mode)
CLK
CMD
DATA
IRQ
BCM43907
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.
Broadcom®
March 12, 2016 • 43907-DS104-R
Page 35
BROADCOM CONFIDENTIAL
CYPRESS [ CYPRESS ]
