WLAN GPIO Signals and Strapping Options
BCM43455 Preliminary Data Sheet
Multiplexed Bluetooth GPIO Signals
The Bluetooth GPIO pins (BT_GPIO_0 to BT_GPIO_7) are multiplexed pins and can be programmed to be used as GPIOs or for other Bluetooth interface
2
signals such as I S. The specific function for a given BT_GPIO_X pin is chosen by programming the Pad Function Control register for that specific pin.
Table 21 shows the possible options for each BT_GPIO_X pin. Note that each BT_GPIO_X pin's Pad Function Control register setting is independent
(BT_GPIO_5 can be set to pad function 7 at the same time that BT_GPIO_3 is set to pad function 0). When the Pad Function Control register is set to
0, the BT_GPIOs do not have specific functions assigned to them and behave as generic GPIOs. The A_GPIO_X pins described below are multiplexed
2
behind the BCM43455's PCM and I S interface pins.
Table 21: GPIO Multiplexing Matrix
Pad Function Control Register Setting
Pin Name
0
1
2
3
4
5
6
7
15
BT_UART_CTS_N
BT_UART_RTS_N
BT_UART_RXD
BT_UART_TXD
BT_PCM_IN
UART_CTS_N
UART_RTS_N
UART_RXD
UART_TXD
A_GPIO[3]
A_GPIO[2]
A_GPIO[1]
A_GPIO[0]
A_GPIO[5]
A_GPIO[6]
GPIO[7]
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
A_GPIO[1]
A_GPIO[0]
GPIO[5]
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
GPIO[4]
–
PCM_IN
PCM_OUT
PCM_SYNC
PCM_CLK
PCM_OUT
PCM_IN
PCM_SYNC
PCM_CLK
HCLK
PCM_IN
HCLK
–
–
I2S_SSDI/MSDI
I2S_SSDO
I2S_SWS
I2S_SSCK
STATUS
TX_CON_FX
I2S_SWS
I2S_SSCK
CLK_REQ
–
SF_MISO
BT_PCM_OUT
BT_PCM_SYNC
BT_PCM_CLK
BT_I2S_DO
PCM_OUT
LINK_IND
–
I2S_MSDO
SF_MOSI
PCM_SYNC
HCLK
–
I2S_MWS
SF_SPI_CSN
PCM_CLK
–
–
I2S_MSCK
SF_SPI_CLK
–
–
–
–
–
–
–
–
–
–
I2S_SSDO
I2S_SSDI/MSDI
–
I2S_MSDO
–
–
–
–
–
–
–
–
–
BT_I2S_DI
HCLK
–
BT_I2S_WS
LINK_IND
I2S_MWS
BT_I2S_CLK
BT_GPIO_5
GPIO[6]
–
INT_LPO
I2S_SSCK
I2S_SSDO
I2S_SWS
I2S_SSDI/MSDI
–
I2S_MSCK
GPIO[5]
I2S_MSCK
–
–
–
–
–
BT_GPIO_4
GPIO[4]
LINK_IND
–
I2S_MSDO
BT_GPIO_3
GPIO[3]
I2S_MWS
–
BT_GPIO_2
GPIO[2]
–
–
–
–
BT_CLK_REQ
WL/BT_CLK_REQ
–
A_GPIO[7]
Broadcom®
November 5, 2015 • 43455-DS109-R
Page 92
BROADCOM CONFIDENTIAL
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