DP83959 datasheet(12/38 Pages) NSC

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4.0

Pin Descriptions (Continued)

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4.7

MISCELLANEOUS PINS

RST_INT/EXT

143

RESET Internal or External: This pin is used to select either internal

(automatic) or external reset mode. External reset pulses should be applied to

the /MLOAD pin. If not used, this pin should be connected to VCC either

directly or via a pull-up resistor (

≈4.7 kΩ).

0 = External reset selected

1 = Internal reset selected

The rising edge of the external (/MLOAD) or internal reset signal starts the 1

second display test operation.

Signal Name

Type

Pin #

Description

Signal Name

Type

Pin #

Description

DEF/OPT

Default/Optional Conﬁguration Mode: This input is used to select the

LERIC8 conﬁguration mode:

1 = Default Mode - The default LERIC8 conﬁguration is used. To select this

mode the DEF/OPT pin should be pulled up to VCC with a 4.7 kΩ

resistor. See Section 5.12 for a description of the default parameters.

0 = Optional Mode - The LERIC8's conﬁguration is loaded into the device at

the trailing edge of reset from values set on the D[3:0] and RA[4:0] pins.

These values are set using 10 k

Ω pull-up or pull-down resistors. For

normal default mode, no resistors are required.

TEST_1

Test 1: This pin should be connected to VCC for normal operation.

TEST_2

103

Test 2: This pin should be connected to GND for normal operation.

TEST_3

104

Test 3: This pin should be left unconnected for normal operation.

TEST_4

111

Test 4: This pin should be connected to GND for normal operation.

TEST_5

102

Test 5: This pin should be connected to GND for normal operation.

TEST_EN

112

Test Enable: This pin selects between normal and factory test operation

modes:

0 = Normal operation - tie the TEST_EN pin to GND for normal operation.

1 = LERIC8 factory test mode - do not use.

RXM

Receive Manchester Data: This pin should be left unconnected for normal

operation. It is the receive Manchester data output and is supplied for

evaluation and testing purposes.

FIL_TTL

101

Filter /TTL Transmit Data: This pin selects between pre-ﬁlter TTL transmit

data and normal ﬁltered analog transmit data. Connect this pin to GND for

normal operation.

0 = Normal Analog Transmit Data - Transmit outputs are normal 10BASE-T.

1 = Pre-Filter TTL Transmit Data - Transmit outputs become TTL level.

1, 2, 40,

41, 42,

80, 81,

82, 119,

120,

121, 160

No Connect: These pins are not connected internally to the DP83959. They

should be connected directly to the PCB ground plane. This will help decrease

the thermal resistance between the device and its environment.

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