XRT86VL38IB484 datasheet(21/160 Pages) EXAR

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XRT86VL38

REV. V1.2.0

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

TABLE 5: GENERAL PURPOSE INPUT/OUTPUT 1 CONTROL REGISTER(GPIOCR1)

HEX ADDRESS: 0X4102

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

7-4

GPIO1_3DIR

GPIO1_2DIR

GPIO1_1DIR

GPIO1_0DIR

R/W

0000

GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_0 Direction

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

GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_0 as either Input pins or Output

pins, as described below.

0 – Configures GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_0 to function as

input pins.

1 – Configures GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_0 to function as

output pins.

1. If GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_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 (GPIO1_3/

GPIO1_2/GPIO1_1/GPIO1_0) within this register.

2. If GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_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

(GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_0) within this register.

3-0

GPIO1_3

GPIO1_2

GPIO1_1

GPIO1_0

R/W

0000

GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_0 Control

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

O Pins, GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_0 have been configured

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

If GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_0 are configured to function

as input pins:

If GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_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 GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_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 GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_0 are configured to function

as output pins:

If GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_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:

GPIO1_3/GPIO1_2/GPIO1_1/GPIO1_0 can be configured to

function as input or output pins, by writing the appropriate

value to Bit 7-4 (GPIO1_3DIR/GPIO1_2DIR/GPIO1_1DIR/

GPIO1_0DIR) within this register.

XRT86VL38IB484 Datasheet(PDF) 21 Page - Exar Corporation

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