TNETX15VE datasheet(95/113 Pages) TI1

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TNETX15VE

VLAN-ENGINE ADDRESS-LOOKUP DEVICE

SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

operating characteristics over recommended operating conditions (see Note 7 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 7: The TNETX3150/TNETX3150A 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. The TNETX15VE outputs the EAM data on the rising edge of OSCIN before the TNETX3150/TNETX3150A

latches the data and holds the data until the end of the transfer burst. This ensures adequate setup and hold times for

TNETX3150/TNETX3150As 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

(input)

DD31–DD0

(input)

DD35–DD32

(input)

EAM15–EAM0

(output)

Forward Pointer Access

440 ns

EOF

10 11 12 13 14

TNETX3150/TNETX3150A

Latches the EAM Code

Here

EAM Code Valid

Figure 20. EAM Bus Timing

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