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4-4 Intel® PXA255 Processor Developer’s Manual
System Integration Unit
GP33 nCS[5] ALT_FN_2_OUT 10 Memory Controller Active low chip select 5
GP34
FFRXD ALT_FN_1_IN
01 UARTs FFUART receive
MMCCS0 ALT_FN_2_OUT 10
Multimedia Card
(MMC) Controller
MMC Chip Select 0
GP35 CTS ALT_FN_1_IN 01
UARTs
FFUART Clear to send
GP36 DCD ALT_FN_1_IN 01 FFUART Data carrier detect
GP37 DSR ALT_FN_1_IN 01 FFUART data set ready
GP38 RI ALT_FN_1_IN 01 FFUART Ring Indicator
GP39
MMCCS1 ALT_FN_1_OUT 01
Multimedia Card
(MMC) Controller
MMC Chip Select 1
FFTXD ALT_FN_2_OUT 10 UARTs FFUART transmit data
GP40 DTR ALT_FN_2_OUT 10
UARTs
FFUART data terminal Ready
GP41 RTS ALT_FN_2_OUT 10 FFUART request to send
GP42
BTRXD ALT_FN_1_IN
01 UARTs BTUART receive data
HWRXD ALT_FN_3_IN
11 HWUART HWUART receive data
GP43
BTTXD ALT_FN_2_OUT 10 UARTs BTUART transmit data
HWTXD ALT_FN_3_OUT 11 HWUART HWUART transmit data
GP44
BTCTS ALT_FN_1_IN
01 UARTs BTUART clear to send
HWCTS ALT_FN_3_IN
11 HWUART HWUART clear to send
GP45
BTRTS ALT_FN_2_OUT 10 UARTs BTUART request to send
HWRTS ALT_FN_3_OUT 11 HWUART HWUART request to send
GP46
ICP_RXD ALT_FN_1_IN
01
Infrared
Communication Port
ICP receive data
RXD ALT_FN_2_IN 10 UARTs STD_UART receive data
GP47
TXD ALT_FN_1_OUT 01 UARTs STD_UART transmit data
ICP_TXD ALT_FN_2_OUT 10
Infrared
Communication Port
ICP transmit data
GP48
nPOE ALT_FN_2_OUT 10 Memory Controller Output Enable for Card Space
HWTXD ALT_FN_1_OUT 01 HWUART HWUART transmit data
GP49
nPWE ALT_FN_2_OUT 10 Memory Controller Write Enable for Card Space
HWRXD ALT_FN_1_IN 01 HWUART HWUART receive data
GP50
nPIOR ALT_FN_2_OUT 10 Memory Controller I/O Read for Card Space
HWCTS ALT_FN_1_IN 01 HWUART HWUART clear to send
GP51
nPIOW ALT_FN_2_OUT 10 Memory Controller I/O Write for Card Space
HWRTS ALT_FN_1 OUT 01 HWUART HWUART request to send
GP52 nPCE[1] ALT_FN_2_OUT 10
Memory Controller
Card Enable for Card Space
GP53 nPCE[2] ALT_FN_2_OUT 10 Card Enable for Card Space
GP53
MMCCLK ALT_FN_1_OUT 01
Multimedia Card
(MMC) Controller
MMC Clock
Table 4-1. GPIO Alternate Functions (Sheet 2 of 4)
Pin
Alternate
Function Name
Alternate Function
Assignment
AF{n}
encoding
Source Unit Signal Description and comments