IDT77105 datasheet(20/24 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

Figure 18 TxOSC and Reset Timing

Figure 19 Utility Bus Read Cycle

Utility Bus Read Cycle

Utility Bus Write Cycle

Utility Bus Read Cycle

Utility Bus Write Cycle

Utility Bus Read Cycle

Utility Bus Write Cycle

Utility Bus Read Cycle

Utility Bus Write Cycle

Name

Min. Max. Unit

Comment

Name

Min. Max. Unit

Comment

Tas

10

—

ns

Address setup to ALE

Tapw

10

—

ns

ALE min pulse width

Tcsrd

0

—

ns

Chip select to read enable

Tas

10

—

ns

Address set up time to ALE

Tah

5

—

ns

Address hold to ALE

Tah

5

—

ns

Address hold time to ALE

Tapw

10

—

ns

ALE min pulse width

Tcswr

0

—

ns

CS Assert to WRB

Ttria

—

0

ns

Address tri-state to RDB assert

Twrpw

20

—

ns

Min. WRB pulse width

Trdpw

20

—

ns

Min. RDB pulse width

Tdws

20

—

ns

Write Data set up time

Tdh

0

—

ns

Data Valid hold time

Tdwh

10

—

ns

Write Data hold time

Tch

0

—

ns

RDB deassert to CS deassert

Tch

0

—

ns

WRB deassert to CS deassert

Ttird

—

10

ns

RDB deassert to data tristate

Taw

20

—

ns

ALE low to end of write

Trd

5

18

ns

Read Data access

Tar

5

—

ns

ALE low to start of read

Trdd

0

—

ns

Start of read to Data low-Z

3445 drw 29

TxOSC

RESET

Trpw

Tcyc

Tch

Tcl

.

3445 drw 21

CS

RD B

ALE

Tah

Tas

Tapw

Tch

Trdd

Trdpw

ADDR/DATA

(output)

Tdh

Trd

Ttrid

Tcsrd

Address

Data

Tar

ADDR/DATA

(input)

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