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Intel® PXA255 Processor Developer’s Manual 4-5
System Integration Unit
GP54 MMCCLK ALT_FN_1_OUT 01
Multimedia Card
(MMC) Controller
MMC Clock
GP54 nPSKTSEL ALT_FN_2_OUT 10 Memory Controller Socket Select for Card Space
GP55 nPREG ALT_FN_2_OUT 10
Memory Controller
Card Address bit 26
GP56 nPWAIT ALT_FN_1_IN 01 Wait signal for Card Space
GP57 nIOIS16 ALT_FN_1_IN 01 Memory Controller Bus Width select for I/O Card Space
GP58
LDD[0] ALT_FN_2_OUT 10
LCD Controller
LCD data pin 0
GP59
LDD[1] ALT_FN_2_OUT 10 LCD data pin 1
GP60
LDD[2] ALT_FN_2_OUT 10 LCD data pin 2
GP61
LDD[3] ALT_FN_2_OUT 10 LCD data pin 3
GP62
LDD[4] ALT_FN_2_OUT 10 LCD data pin 4
GP63
LDD[5] ALT_FN_2_OUT 10 LCD data pin 5
GP64
LDD[6] ALT_FN_2_OUT 10 LCD data pin 6
GP65
LDD[7] ALT_FN_2_OUT 10 LCD data pin 7
GP66
LDD[8] ALT_FN_2_OUT 10 LCD Controller LCD data pin 8
MBREQ ALT_FN_1_IN 01 Memory Controller
memory controller alternate bus
master req
GP67
LDD[9] ALT_FN_2_OUT 10 LCD Controller LCD data pin 9
MMCCS0 ALT_FN_1_OUT 01
Multimedia Card
(MMC) Controller
MMC Chip Select 0
GP68
MMCCS1 ALT_FN_1_OUT 01
Multimedia Card
(MMC) Controller
MMC Chip Select 1
LDD[10] ALT_FN_2_OUT 10 LCD Controller LCD data pin 10
GP69
MMCCLK ALT_FN_1_OUT
01
Multimedia Card
(MMC) Controller
MMC_CLK
LDD[11] ALT_FN_2_OUT 10 LCD Controller LCD data pin 11
GP70
RTCCLK ALT_FN_1_OUT
01
System Integation
Unit
Real Time clock (1 Hz)
LDD[12] ALT_FN_2_OUT 10 LCD Controller LCD data pin 12
GP71
3.6 MHz ALT_FN_1_OUT
01
Clocks & Power
Manager Unit
3.6 MHz Oscillator clock
LDD[13] ALT_FN_2_OUT 10 LCD Controller LCD data pin 13
GP72
32 kHz ALT_FN_1_OUT
01
Clocks & Power
Manager Unit
32 kHz clock
LDD[14] ALT_FN_2_OUT 10 LCD Controller LCD data pin 14
GP73
LDD[15] ALT_FN_2_OUT 10 LCD Controller LCD data pin 15
MBGNT ALT_FN_1_OUT 01 Memory Controller Memory controller grant
Table 4-1. GPIO Alternate Functions (Sheet 3 of 4)
Pin
Alternate
Function Name
Alternate Function
Assignment
AF{n}
encoding
Source Unit Signal Description and comments