TNETX3151 datasheet(36/65 Pages) TI1

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TNETX3151

ThunderSWITCH

™ 12/3 ETHERNET™ SWITCH

WITH 12 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS

SPWS048A – MARCH 1998 – REVISED APRIL 1999

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

SDRAM interface (continued)

Table 14. TNETX3151 Terminal Interface to SDRAMs

TERMINALS

SDRAM TERMINAL FUNCTION

TNETX3151

SDRAM

SDRAM TERMINAL FUNCTION

DA13

A13

Row/bank address (64-M SDRAMs only)

DA12

A12

Row/bank address (64-M SDRAMs only)

DA11

A11

Row/bank address

DA10

A10

Row address/auto-precharge select

DA09

Row address

DA08

Row address/column address (

× 8 only)

DA07

Row address/column address

DA06

Row address/column address

DA05

Row address/column address

DA04

Row address/column address

DA03

Row address/column address

DA02

Row address/column address

DA01

Row address/column address

DA00

Row address/column address

DRAS

RAS

Row address strobe

DCAS

CAS

Column address strobe

Write enable

DCLK

CLK

Clock

DD31–DD16

DQ15–DQ0

SDRAM1. Data I/O (

× 16 SDRAMs)

DD15–DD00

DQ15–DQ0

SDRAM0

DD31–DD24

DQ7–DQ0

SDRAM3. Data I/O (

× 8 SDRAMs)

DD23–DD16

DQ7–DQ0

SDRAM2

DD15–DD08

DQ7–DQ0

SDRAM1

DD07–DD00

DQ7–DQ0

SDRAM0

DA13 and DA12 should be left unconnected if 16M-bit SDRAMs are used. The remaining functional SDRAM

terminals that are not directly controlled by the SDRAM interface should be tied off from the external system

during operation (see Table 15).

Table 15. SDRAM Terminals Not Driven by the TNETX3151

HELD

SDRAM

TERMINAL

SDRAM

TERMINAL FUNCTION

Low

Chip select

High

CKE

CLK enable

Low

DQM

Data mask (

× 8 SDRAMs)

Low

DQML

Data mask (

× 16 SDRAMs)

Low

DQMU

Data mask (

× 16 SDRAMs)

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