IDT77105 Datasheet, PDF (1/24 Pages) Integrated Device Technology – PHY (TC-PMD) for 25.6 Mbps ATM Networks

PHY (TC-PMD) for 25.6 Mbps
ATM Networks
IDT77105
Features List
! _{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)}
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.
Block Diagram
TxR ef
TxCLK
TxDATA ⁹
TxSOC
TxE N B
TxFull/CLAV
2 CELL FIFO
ALE
W RB
RDB
CS
ADDR/DATA ⁸
IN T
RESET
UPLO
UTILITY
BUS
CONTROLLER
RxCLK
RxDATA ⁹
RxSOC
R xE nb
RxEm pty/CLAV
R xR ef
2 CELL FIFO
TxLED
SCRAMBLER
PRNG
4B/5B
ENCODER
P/S
NRZI
Line
Driver
TXD+
TXD-
RESET
LOOP BACK
DESCRAMBLER
5B/4B
DECODER
S/P
DNRZI
CLK
REC
Line
RxVR
RxD+
RxD-
RxLED
77105
PLL_Filter_2
TxOSC
PLL_Filter_1
3445 drw 00
 2000 Integrated Device Technology, Inc.
1 of 24
September 11, 2000
DSC 3445