XRT86VL38IB484 datasheet(21/180 Pages) EXAR

21 / 180 page

PRELIMINARY

XRT86VL38

REV. P1.0.9

OCTAL T1/E1/J1 FRAMER/LIU COMBO - E1 REGISTER DESCRIPTION

TABLE 4: GENERAL PURPOSE INPUT/OUTPUT 0 CONTROL REGISTER (GPIOCR0)

HEX ADDRESS: 0X0102

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

7-4

GPIO0_3DIR

GPIO0_2DIR

GPIO0_1DIR

GPIO0_0DIR

R/W

1111

GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 Direction

These bits permit the user to define the General Purpose I/O Pins,

GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 as either Input pins or Output

pins, as described below.

0 – Configures GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 to function as

input pins.

1 – Configures GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 to function as

output pins.

1. If GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 are configured to

function as input pins, then the user can monitor the state of

these input pins by reading out the state of Bit 3-0 (GPIO0_3/

GPIO0_2/GPIO0_1/GPIO0_0) within this register.

2. If GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 are configured to

function as output pins, then the user can control the state of

these output pins by writing the appropriate value into Bit 3-0

(GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0) within this register.

3-0

GPIO0_3

GPIO0_2

GPIO0_1

GPIO0_0

R/W

0000

GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 Control

The exact function of this bit depends upon whether General Purpose I/

O Pins, GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 have been configured

to function as input or output pins, as described below.

If GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 are configured to function

as input pins:

If GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 are configured to function as

input pins, then the user can monitor the state of the corresponding

input pin by reading out the state of these bits.

NOTE:

If GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 are configured to

function as input pins, then writing to this particular register will

have no effect on the state of this pin.

If GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 are configured to function

as output pins:

If GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 are configured to function as

output pins, then the user can control the state of the corresponding

output pin by writing the appropriate value to these bits.

NOTE:

GPIO0_3/GPIO0_2/GPIO0_1/GPIO0_0 can be configured to

function as input or output pins, by writing the appropriate

value to Bit 7-4 (GPIO0_3DIR/GPIO0_2DIR/GPIO0_1DIR/

GPIO0_0DIR) within this register.

XRT86VL38IB484 Datasheet(PDF) 21 Page - Exar Corporation

XRT86VL38IB484 Datasheet(HTML) 21 Page - Exar Corporation

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