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YTD423-S Datasheet

  • YTD423-S

  • Telecommunication IC

  • 210.47KB

  • 11頁

  • ETC

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YTD423
IHDLC2
ISDN BRI controller with B-ch HDLC controllers
1 INTRODUCTION
YTD423 is a high-performance communication LSI for the ISDN BRI user-network interface function (digital
four-wire time-division full-duplex operation), supporting D-channel layer 1, layer 2 and HDLC controller for B-
channels, all in one 100-pin SQFP chip. YTD423 supports layer 1 (physical layer) control function conforming
to ITU-T Recommendation I.430 and fully supports layer 2 (LAP-D protocol) function conforming to ITU-T
Recommendations Q.920 and Q.921. ETSI (European Telecommunications Standards Institute) and several North
American standard operating modes are also supported. In addition, YTD423 includes layer 3 processor interface
function and 2-channel HDLC controller for B-channels, which operate in DMA transfer mode or I/O transfer
mode. This gives a great advantage to mounting and functional designing of both \active" (with CPU on board)
terminal equipment and \passive" (no CPU on board) PC cards. In order to support the U interface, YTD423 has
a TTL interface (no built-in analog driver/receiver) suitable for connecting to an NT1 chip or a DSU module. S/T
reference point can also be supported by connecting it to YTD421 (analog driver/receiver LSI).
1.1
Features
1. Layer 1 function

Supports layer 1 control function conforming to ITU-T Recommendation I.430 [1992 edition] and TTC
Standard JT-I430 [1993 edition] (default)
{
TTL interface
{
192 kbps transmission rate
{
Interface structure : 2B + D (B = 64 kbps, D = 16 kbps)
{
Frame assembling and disassembling function
{
Collision control (built-in random number (Ri) reset), priority control (built-in retransmission con-
trol), and state transition control
{
Programmable T3 and T4 timers
YTD423D CATALOG
CATALOG No.:4TD423D2
1999.2

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