HMS91C7432 datasheet(2/24 Pages) HYNIX

2 / 24 page

Hynix semiconductor

HMS91C7432 features and functions

z Implementation of the complete TCP/IP protocol suite

z Built-in Email sending and reception function.

z Standard SMTP protocol stack.

z Standard POP3 protocol stack.

z Standard PPP protocol stack to facilitate dial-up network log on.

z Standard DNS protocol stack, resolve URL with dynamic DNS server.

z Serial modem driver built-in.

z Support V.90 56Kflex modem or lower.

z 8 bit parallel interface to the user application.

z Serial DTE port for ease of modem interface.

z 5V or 3.3V operation voltage

z 20 pins SOP package

Detail description of HMS91C7432 function and its application

TCP/IP protocol suite is the key to inter-net

access. Email; Home Page materials and all

the data traffic on the inter-net are carry out

by using the TCP/IP well defined format.

Time before HMS91C7432 exist, most inter-

net connection were to be handled by the PC.

Hand held devices and equipments must be

attached to the PC to get access to the

inter-net. Now the era of “PC-free” inter-net

connection has come. With HMS91C7432,

you can make your product be able to send

and receive email; surf on the WWW and

even “TALK” to another device through the

inter-net, by just plugging the telephone line

onto it.

The core of the HMS91C7432 is a complete

TCP/IP protocol suite. Files and messages

pass to the HMS91C7432 will be transformed

into the appropriate format and packets to

conform the inter-net standard. This

transformation is transparent to the user’s

application.

On top of the TCP/IP core, there is an Email

engine built-in. User’s program just needed

to inform the HMS91C7432 an email is going

to send and follow with the email body.

HMS91C7432 will then wake up the modem

and dial the ISP to log on the mail server. The

mail will be sent when log on has success.

HMS91C7432 complete this whole process

fully automatic.

Reception of Email is as simple as getting

email on the PC. The application program

send a “Receive Email” command to the

HMS91C7432, it dial up the ISP and log on

the server, then it check and download any

email automatically. Each message will be

stored in the RAM buffer, HMS91C7432 will

notify the application program an email has

come and waiting for retrieve.

The built-in PPP module handles the “Log on

process”. This is a standard protocol to pass

the user’s account ID and the password to

the ISP. This module handles the

authentication and “Handshaking”. User’s

program just pass the user’s ID and

password to HMS91C7432 and the PPP do it

all.

HMS91C7432 (later version only) also equip

with a FTP module to facilitate file transfer

and file downloading from the FTP site. This

function is especially good for remote system

update and game download for hand-held

game inter-net access.

The standard serial DTE interface on the

HMS91C7432 ease the modem connection.

The built-in modem driver support V.90 and

56K flex dual modem or lower.

HMS91C7432 is controlled by an 8 bit

data/command port. This port accepts

command passed by the host MCU.

Incoming and outgoing message will be

passed between the host and the

HMS91C7432 through this port as well.

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