SPEAR300 datasheet(47/83 Pages) STMICROELECTRONICS

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SPEAr300

Pin description

Doc ID 16324 Rev 2

47/83

Notes/legend for Table 11:

GPIO (General purpose I/O):

basGPIO: Base GPIOs in the basic subsystem (enabled as alternate functions)

G10 and G8: GPIOs in the RAS subsystem

GPIOx: GPIOs in the independent GPIO block in the RAS subsystem

TDM_ : TDM interface signals

SD_ : SDIO interface

IT pins: interrupts

Table cells filled with ‘0’ or ‘1’ are unused and unless otherwise configured as Alternate

function or GPIO, the corresponding pin is held at low or high level respectively by the

internal logic.

Table cells filled with ‘Reserved’ denote pins that must be left unconnected.

3.4

PL_GPIO pin sharing for debug modes

In some cases the PL_GPIO pins may be used in different ways for debugging purposes.

There are three different cases (see also Table 13):

Case 1 - All the PL_GPIO get values from Boundary scan registers during Ex-test

instruction of JTAG . Typically this configuration is used to verify correctness of the

soldering process during the production flow .

Case 2 - All the PL_GPIO maintain their original meaning but the JTAG Interface is

connected to the processor. This configuration is useful during the development phase

but offers only "static" debug.

Case 3 - Some PL_GPIO, as shown inTable 13: Ball sharing during debug

, are used to

connect the ETM9 lines to an external box. This configuration is typically used only

during the development phase. It offers a very powerful debug capability. When the

processor reaches a breakpoint it is possible, by analyzing the trace buffer, to

understand the reason why the processor has reached the break.

Table 12.

Table shading

Shading

Pin group

FSMC

FSMC pins: NAND or NOR Flash

Keyboard

Keyboard pins ROWs are outputs, COLs are inputs

CLCD

Color LCD controller pins

CAMERA

Camera pins

UART

UART pins

Ethernet MAC

MII/SMII Ethernet Mac pins

SDIO/MMC

SD card controller pins

GPT

Timer pins

IrDa

IrDa pins

SSP

SSP pins

I2C

I2C pins

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