TNETX3150 datasheet(67/78 Pages) TI

67 / 78 page

TNETX15AE

ADDRESS-LOOKUP DEVICE

SPWS041A – AUGUST 1997 – REVISED OCTOBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

operating characteristics over recommended operating conditions (see Note 5 and Figure 20)

EAM routing code

NO.

PARAMETER

MIN

MAX

UNIT

td(EAM)1

Delay time, from EAM15–EAM0 valid to EAM15–EAM0 invalid

100

td(EAM)2

Delay time, from OSCIN

↑ to EAM15–EAM0 valid

NOTE 5: The TNETX3150/TNETX3150A/TNETX3100 latches the EAM data (at certain edges) on frames that write the first 64 bytes of frame

data to the DRAM. The edges where EAM is valid are shown in Figure 20. At other times, the value in EAM is not valid and is ignored

by the TNETX3150/TNETX3150A/TNETX3100. The TNETX15AE outputs the EAM data on the rising edge of OSCIN before the

TNETX3150/TNETX3150A/TNETX3100 latches the data and holds the data until the end of the transfer burst. This ensures adequate

setup and hold times for TNETX3150/TNETX3150A/TNETX3100s EAM input. The particular frame, where the EAM code is valid, is

identified by the start-of-frame (SOF) indicator in the frames flag fields and by the DWE strobe being low. The EAM code is not valid

on DRAM reads [DWE = (1)] on refresh cycles or on IOB buffer writes and reads.

OSCIN

(Input)

DWE

(Input)

DRAS

(Input)

DCAS

(Input)

Row

Col

FPTR

Data

Col

Data

DA7–DA0

DX2–DX0

DD31–DD0

(Input)

DD35–DD32

(Input)

EAM15–

EAM0

(Output)

Forward Pointer Access

High Nibble of

Start Flag (SOF)

440 ns

EOF

6 7

9 10 11 12 13 14

TNETX3150/TNETX3150A/TNETX3100

Latches the EAM Code Here

EAM Code Valid

Figure 20. EAM Bus Timing

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