System Integration Unit

Table 4-1. GPIO Alternate Functions (Sheet 3 of 4)

 

 

 

 

 

 

 

Pin

Alternate

Alternate Function

AF{n}

Source Unit

Signal Description and comments

Function Name

Assignment

encoding

 

 

 

 

 

 

 

 

 

GP54

MMCCLK

ALT_FN_1_OUT

01

Multimedia Card

MMC Clock

(MMC) Controller

 

 

 

 

 

 

 

 

 

 

 

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 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 Controller

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

 

 

 

 

 

 

 

LDD[8]

ALT_FN_2_OUT

10

LCD Controller

LCD data pin 8

GP66

 

 

 

 

 

MBREQ

ALT_FN_1_IN

01

Memory Controller

memory controller alternate bus

 

 

master req

 

 

 

 

 

 

 

 

 

 

 

 

LDD[9]

ALT_FN_2_OUT

10

LCD Controller

LCD data pin 9

GP67

 

 

 

 

 

MMCCS0

ALT_FN_1_OUT

01

Multimedia Card

MMC Chip Select 0

 

 

(MMC) Controller

 

 

 

 

 

 

 

 

 

 

 

 

MMCCS1

ALT_FN_1_OUT

01

Multimedia Card

MMC Chip Select 1

GP68

(MMC) Controller

 

 

 

 

 

 

 

 

 

 

LDD[10]

ALT_FN_2_OUT

10

LCD Controller

LCD data pin 10

 

 

 

 

 

 

 

MMCCLK

ALT_FN_1_OUT

01

Multimedia Card

MMC_CLK

GP69

(MMC) Controller

 

 

 

 

 

 

 

 

 

 

LDD[11]

ALT_FN_2_OUT

10

LCD Controller

LCD data pin 11

 

 

 

 

 

 

 

RTCCLK

ALT_FN_1_OUT

01

System Integation

Real Time clock (1 Hz)

GP70

Unit

 

 

 

 

 

 

 

 

 

 

LDD[12]

ALT_FN_2_OUT

10

LCD Controller

LCD data pin 12

 

 

 

 

 

 

 

3.6 MHz

ALT_FN_1_OUT

01

Clocks & Power

3.6 MHz Oscillator clock

GP71

Manager Unit

 

 

 

 

 

 

 

 

 

 

LDD[13]

ALT_FN_2_OUT

10

LCD Controller

LCD data pin 13

 

 

 

 

 

 

 

32 kHz

ALT_FN_1_OUT

01

Clocks & Power

32 kHz clock

GP72

Manager Unit

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

Intel® PXA255 Processor Developer’s Manual

4-5

Page 109
Image 109
Intel PXA255 manual Gpio Alternate Functions Sheet 3, MMCCS0 ALTFN1OUT, Mbgnt ALTFN1OUT