IDT77105 datasheet(19/24 Pages) IDT

Part #	IDT77105

Description	PHY (TC-PMD) for 25.6 Mbps ATM Networks

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Manufacturer	IDT [Integrated Device Technology]

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September 11, 2000

IDT77105

UTOPIA Bus Timing Parameters

Figure 17 UTOPIA Receive

TxOSC and Reset Timing

Symbol

Parameter

Min.

Max.

Unit

t1

RxEnb set up time to RxCLK

10

—

ns

t2

RxEnb hold time from RxCLK

2

—

ns

t3

tPD from RxCLK to RxSOC, RxData, and RxRef

3

10

ns

t4

RxEmpty delay from RxCLK

1

20

ns

t5

TxData[7:0], TxParity setup time to TxCLK

10

—

ns

t6

TxData[7:0], TxParity hold time from TxCLK

2

—

ns

t7

TxSOC, TxEnb setup time to TxCLK

10

—

ns

t8

TxSOC, TxEnb hold time from TxCLK

2

—

ns

t9

TxFull delay from TxCLK

1

20

ns

t10

TxRef pulse width

TxCLK Period +5ns

—

ns

t11

RxCLK period

30

400

ns

t12

RxCLK duty cycle (T of t11)

40

60

ns

t13

TxCLK period

30

400

ns

t14

TxCLK duty cycle (% of t13)

40

60

ns

t15

RxCLK to RxData [7:0], RxParity, and RxSOC low impedance

2

12

ns

Symbol

Parameter

Min.

Typ.

Max.

Unit

Tcyc

TxOSC frequency (25.6 Mbps)

31.5

32

32.5

MHz

Tch

TxOSC high duty cycle (% of Tcyc)

40

50

%

Tcl

TxOSC low duty cycle (% of Tcyc))

40

50

%

Trpw1

1. Trpw must meet both minimum limits.

Minimum Resetpulse width

2* TxCLK period

—

2* RxCLK period

—

RxCLK

RxSOC

RxEmpty/RxClav

RxEnb

RxData [7:0],

RxParity

3445 drw 20

Octet 1

Octet 2

Octet 49

Oct

t1

t4

t2

RxRef

t15

t3

t11

t12

Hi-Z

Octet 0

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