BCM89359 Advance Data Sheet
SDIO v3.0
SDIO Pins
Table 16: SDIO Pin Descriptions
SD 1-Bit Mode
SD 4-Bit Mode
DATA0
DATA1
DATA2
DATA3
CLK
Data line 0
DATA
IRQ
Data line
Data line 1 or Interrupt
Data line 2 or Read Wait
Data line 3
Interrupt
RW
Read Wait
Not used
Clock
N/C
Clock
CLK
CMD
CMD
Command line
Command line
Figure 23: Signal Connections to SDIO Host (SD 4-Bit Mode)
CLK
CMD
BCM89359
SD Host
DAT[3:0]
Figure 24: Signal Connections to SDIO Host (SD 1-Bit Mode)
CLK
CMD
DATA
BCM89359
SD Host
IRQ
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 lines and the 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®
September 9, 2014 • 89359-DS100-R
Page 60
BROADCOM CONFIDENTIAL
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