PHY (TC-PMD) for 25.6 Mbps
ATM Networks
IDT77105
Features List
!
Description
The IDT77105 is a member of IDT's family of products developed to
support Asynchronous Transfer Mode (ATM) data communications and
networking. The IDT77105 provides the Transmission Convergence
(TC) and (PMD) layers of a 25.6 Mbps ATM PHY suitable for ATM
networks using Unshielded Twisted Pair (UTP) Category 3 (or better)
wiring. The UTOPIA interface provides standardized control and
communications to other components, such as Segmentation and Reas-
sembly (SAR) controllers and ATM switches.
The IDT77105 supports a simple interface to magnetics modules.
The IDT77105 is fabricated using IDT's state-of-the-art CMOS tech-
nology, providing the highest levels of integration, performance and reli-
ability, with the low-power consumption characteristics of CMOS.
!
!
!
!
!
!
!
!
!
!
!
Performs the PHY-Transmission Convergence (TC) and
Physical Media Dependent (PMD) Sublayer functions for
25.6 Mpbs ATM Networks
Performs clock/data recovery, serializing/deserializing &
framing
ITU-T I.432 and I.432.5 compliant
ATM Forum af-phy-0040 compliant
UTOPIA Level 1 Interface
2-Cell Transmit & Receive FIFOs
Supports Multi PHY Connections
LED Interface for status signalling
Supports UTP Category 3 (CAT 3) physical media
Interfaces to standard magnetics
Low-Power CMOS
64-pin STQFP Package (10 x 10mm)
Block Diagram
TxLED
TxRef
TxCLK
TxDATA
TxSOC
TxENB
TxFul
/CLAV
l
9
2 CELL FIFO
SCRAMBLER
4B/5B
ENCODER
P/S
NRZI
Line
Driver
TXD+
TXD-
PRNG
ALE
W RB
RD B
CS
ADDR/DATA
I
NT
RESET
UPLO
8
UTILITY
BUS
CONTROLLER
RESET
LOOP BACK
RxCLK
RxDATA
RxSOC
R xEnb
RxEm pt
y/CLAV
RxRef
9
2 CELL FIFO
DESCRAMBLER
5B/4B
DECODER
S/P
DNRZI
CLK
REC
Line
RxVR
RxD+
RxD-
77105
RxLED
PLL_Filter_2
TxOSC
PLL_Filter_1
3445 drw 00
1 of 24
2000 Integrated Device Technology, Inc.
September 11, 2000
DSC 3445
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
