BCM43907 Datasheet, PDF (36/128 Pages) Cypress Semiconductor – WICED™ IEEE 802.11 a/b/g/n SoC with an Embedded Applications Processor

BCM43907 Preliminary Data Sheet
SDIO Pins
Table 7: SDIO Pin Descriptions
SD 4-Bit Mode
SD 1-Bit Mode
DATA0 Data line 0
DATA Data line
DATA1
DATA2
DATA3
CLK
CMD
Data line 1 or Interrupt IRQ
Data line 2 or Read Wait RW
Data line 3
N/C
Clock
CLK
Command line
CMD
Interrupt
Read Wait
Not used
Clock
Command line
Figure 7: Signal Connections to an SDIO Host (SD 4-Bit Mode)
CLK
SD Host
CMD
DAT[3:0]
BCM43907
Figure 8: Signal Connections to an SDIO Host (SD 1-Bit Mode)
SD Host
CLK
CMD
DATA
IRQ
RW
BCM43907
SDIO 3.0
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
BROADCOM CONFIDENTIAL
Page 35