Datasheet > LXT901/LXT907

LXT901/LXT907

更新时间： 2022-01-18 23:21:00

品牌	Logo	应用领域
其他 - ETC		控制器以太网
页数	文件大小	规格书
10页	80K
描述
LXT901. LXT907 - Design Guide for LXT901/907 Ethernet Interface Connection to Motorola MC68EN360 Controller

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LXT901/LXT907 数据手册

Design Guide for LXT901/907 Ethernet Interface

2.0

LXT90x / QUICC Interface

The LXT901 is available in either a 44-pin PLCC or a 64-pin TQFP package. The LXT907 is

available in a 44-pin PLCC package. The PLCC package is pin compatible for both devices except

for pin 37. This pin is STP (unshielded/shielded twisted-pair select) on the LXT901 and DSQE

(Disable SQE) on the LXT907 device.

The following pins on the LXT901 or LXT907 device connect to the MC68EN360 SCC1 signals

as shown in Table 1.

Table 1. Pin Connections

LXT901/LXT907 Device

Motorola QUICC

MC68EN360

SCC1 Signal

PLCC

TQFP

Signal

RCLK

CLK1-4

TCLK

TXD

CLK1-4

TXD

RXD

TEN

RXD

RTS

COL

CTS

LBK

PAUI

AUTOSEL

NTH

Connect these bits to

the Parallel I/O bus on

the QUICC and

n/a

program as needed.

37 (901)

37 (907)

STP

DSQE

1. The design must provide separate clocks for TCLK and

RCLK. Any of the clocks on the QUICC will do.

2. These signals are active high in this application.

3. Please check the Motorola specification for the connections

needed for the desired result.

2.1

Setting QUICC Parameters

Refer to the Motorola MC68360 Quad Integrated Communications Controller User’s Manual for

the QUICC function settings. The following considerations should be reviewed for an optimized

design:

• Bypass both the Digital Phase-Locked Loop (DPLL) and Manchester Encoding/Decoding

function for Ethernet operation.

• The TCI (Time Clock Invert) bit must be High to allow the QUICC to clock the data out to the

LXT901 or LXT907 device on the rising edge of the clock pulse. This improves data setup

time at the 10 Mbps speed used by Ethernet. TCI is bit 28 of the General SCC Mode Register

(GSMR).

Application Note

1...4 5 678 9 10

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