BCM4319 Preliminary Data Sheet
Strapping Options and GPIO Functions
Table 8: Strapping Options
Default
State
Pin Name
Ball #
Function
Description
GPIO_0
WK8
Low
Selects Interface
–
USB mode ( strapping):
modesa (depends on
strapping). This pin
should not be used as a
generic input and
•
•
0: normal (default)
1: USB CPU-less mode
SDIO mode ( strapping):
•
•
0: SDIO (default)
1: gSPI mode
should not be driven by
other devices.
GPIO_1
WH10 Low
GPIO
–
gSPI clock polarity strapping in gSPI
mode: do not care in all other modesb.
Default = 0
GPIO_2
GPIO_3
WK9
WJ9
–
GPIO
GPIO
–
–
No strapping functions for this pin
Low
gSPI clock phase strapping in gSPI
mode: do not care in all other modes.
GPIO_6
GPIO_7
WK10
WJ10
Low
GPIO[7:6]
[7:6] = 00 OTP enabled, use default SDIO CIS
[7:6] = 01 01 Reserved
High
[7:6] = 10 OTP enabled, load SDIO CIS from
OTP (default)
[7:6] = 11 11 Reserved
GPIO_8
GPIO_9
WM4
Low
Sets SDIO and USB
Boot mode
0
1
–
USB mode (default)
SDIO mode
WF11
High
USB mode:
USB normal mode
0: remap to RAM, ARM held in
reset after POR (internal use only)
1: boot from ROM, ARM automatically
runs after POR (required for USB
normal mode)
USB CPU-less mode:
Do not care, ARM held in reset
after POR
SDIO/gSPI Mode
Do not care, ARM held in reset
after POR
a. Typically used as an output for WLAN_HOST_WAKE and as an out-of-band interrupt for the SDIO interface. It
has a hardware generated interrupt and is always valid (unlike the SDIO in-band interrupt, which is valid only
when data is not driven on the SDIO lines). This out-of-band interrupt mimics the final in-band interrupts so all of
the interrupt enables (such as per-function interrupt enables) should be set appropriately.
b. This pin is often used as an input for the out-of-band power control signal WLAN_WAKE.
Broadcom®
April 2, 2014 • 4319-DS05-R
Single-Chip IEEE 802.11™ a/b/g/n MAC/Baseband/Radio
Page 56
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