HDLC peripheral

paradiso · ‎2005-04-20

Posted on April 20, 2005 at 12:08

HDLC peripheral

paradiso · ‎2005-01-19

Posted on January 19, 2005 at 12:45

i'm tring to understand what is the use of the HDLC peripheral..

is it possible to use this peripheral to connect on an Ethernet LAN ? did the processor include all the hardware for that ? that means we can connect directly an RJ45 connector...

if not : how this peripheral is used for???

Many thanks for the help....

hichem2 · ‎2005-01-23

Posted on January 24, 2005 at 07:02

Hi JPPP,

The HDLC protocol is defined by ISO for use on both point-to-point and multipoint (multidrop) data links. It supports full duplex transparent-mode operation and is now extensively used in both multipoint and computer networks.

concerning our product of corse you can connect an Ethernet LAN but we can't connect directly an RJ45 connector ?! 😉

with regards

HICH.

[ This message was edited by: Hich on 25-01-2005 14:09 ]

paradiso · ‎2005-01-24

Posted on January 24, 2005 at 09:28

hi Hich, thanks for your replay,

just a precision, did i need to imlement an TCP/IP stack to use the HDLC for Point to point or multipoint conection ?

or it is used with a special library with standard API ?

thanks again, it's my last question !!! 🙂

hichem2 · ‎2005-01-25

Posted on January 25, 2005 at 10:01

Hi JPPP,

I look at your question and I will you reply as soon as possible.

Best Regards

Hich

gianfranco2 · ‎2005-01-27

Posted on January 28, 2005 at 06:11

Hich,

I am very interested to imlement an TCP/IP stack to use the HDLC.

Please, do you have further information about it?

Tks

hichem2 · ‎2005-03-04

Posted on March 04, 2005 at 10:40

Hi dimarcog,

Bellow some HDLC Caracteristic used to determine maximum speed using HDLC and Manchaster coding, hope this can help you and i will contact you if I have any information about the subject.

The STR71x HDLC has been used by customer in the following

conditions:

TX: 921KBit (manchester)

RX: 250KBit (NRZI)

Anyway our engineer verified that the maximum baudrate could be:

TX: APB clk (APB=32MHz), but, due to the fact that the pad cannot reach

more than 16MHz, clock in TX should be divided, at least, by 2.

RX: APB clk/16.

Cheers,

Hich :p

hanc · ‎2005-03-17

Posted on March 18, 2005 at 05:04

Hello,

I am confused with the HDLC. I am not familiar with it. For what particular use we can get benefit of this module? What kind of physical layer we can use? Any example or schematic would be nice. I searched the internet about HDLC but I could not find any valuable data.

Regards,

HAN

philip1 · ‎2005-04-19

Posted on April 19, 2005 at 09:15

Hi

I am also considering using the HDLC as a multi-point communications interface but I am a bit confused. The data says it can transmit at 16 MHz (I assume that is Mbaud) but the receiver can only receive at F(PCLK)/16.

PCLK seems to be limited to a max frequency of 20MHz so for two ARM7s to talk to each other the max baud rate would be 1.25Mbaud.

Is that right?

hichem2 · ‎2005-04-19

Posted on April 19, 2005 at 12:49

Hello philipj,

Using PCLK a max frequency can be reached is about 33MHz so for two ARM7s to talk to each other the max baud rate would be 2Mbaud when yo uuse 32MHz.

Cheers,

Hich 😉