TheEarthWiki

Device

Physical

Virtual

latch1

0x01000000

0xEA000000

latch2

0x08000000

0xEC000000

modem

0x04000000

0xEB000000

The E3 uses 3 HC377 octal d-type flip-flops to create 1 8-bit and 1 16-bit latch. These are write-only.

latch1 (8 bit)

Bit

Function

0

Camera LED

1

Advert LED

2

Email LED

3

Handsfree LED

4

Voicemail LED

5

Voice LED

6

Connected to dockit port. Inverted and at 5v levels

7

Connected to dockit port. Inverted and at 5v levels

latch2 (16 bit)

Bit

Function

0

LCD VBLEN

1

LCD NDISP

2

NAND NCE

3

NAND NRE

4

NAND NWP

5

NAND NWE

6

NAND ALE

7

NAND CLE

8

Mailboard power - provides +5V to mailboard when set

9

Output to mailboard DATA (open collector)

10

Smartcard - RSTIN (Inverted by a transistor on the smartcard board)

11

Smartcard - CMDVCC

12

Modem NRESET

13

Modem CODEC - switches CX20442 codec digital inputs between the modem (=1) and the DSP (=0)

14

Hookflash? - The amstrad software produces a high pulse on this line when
The phone is taken off hook or Recall is pressed

15

Hookflash? - As 14. Not sure why 2 pins are needed for this?

There are also 16 bits of GPIO

Bit

Function

0

Mailboard data (inverted)

1

Mailboard clock (inverted)

2

MODEM IRQ

3

dockit

4

Phone hook

5

Not available - no physical pin

6

Smartcard - NOFF

7

Smartcard - IO

8

Smartcard? (AUX1?)

9

Smartcard? (AUX2?)

10

Not available - no physical pin

11

PROC_CONFIG_0 - 0 = B&W LCD, 1 = colour LCD
Connected to CONF 0 pads on PCB. 1-2 = colour 2-3 = B&W

12

NAND RB

13

Not available - physical pins used for keypad matrix

14

Not available - physical pins used for keypad matrix

15

Not available - physical pins used for keypad matrix

Camera Interface

The camera is connected to SK1 on the main board. This connector also contains the I2C bus signals.
Looking at the component side of the main board, with the external connectors (power, usb, serial) furthest from you, the pinout is as follows:

GND

?

?

?

SCL

SDA

?

?

?

?

?

?

?

?

?

?

?

?

GND

+3.3V

TheEarthWiki: E3_IO_Ports (last edited 2008-02-19 15:39:12 by localhost)