TNETX3150A datasheet(15/113 Pages) TI1

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TNETX3150/TNETX3150A

ThunderSWITCH™ 15-PORT 10-/100-MBIT/S ETHERNET™ SWITCH

SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

Terminal Functions (Continued)

direct input/output (DIO) and statistics interface

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

SAD1

W24

DIO address SAD1 SAD0 selects the TNETX3150/TNETX3150A host registers

SAD0

W23

DIO address. SAD1–SAD0 selects the TNETX3150/TNETX3150A host registers.

SCS

W25

DIO chip select. When low, SCS indicates a port access is valid.

SDATA7

AA25

SDATA6

AA24

SDATA5

AA23

SDATA4

Y26

I/O

DIO data SDATA7 SDATA0 is bidirectional byte wide data

SDATA3

Y25

I/O

DIO data. SDATA7–SDATA0 is bidirectional byte-wide data.

SDATA2

Y24

SDATA1

Y23

SDATA0

W26

SRDY

AA26

DIO ready. When low, SRDY indicates to the host that data is ready to be read. SRDY also indicates

when data has been received for the write cycle. The TNETX3150/TNETX3150A drives SRDY high

for one clock cycle before placing the output in the high-impedance (Z) state after SCS is taken high.

SRDY should be pulled high with an external pullup resister.

SRNW

V26

DIO read not write. When low, SRNW indicates a write cycle on the DIO port.

EEPROM interface

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

ECLK

AF21

EEPROM data clock. ECLK is the serial EEPROM clock and requires an external pullup resistor.

EDIO

AE21

I/O

EEPROM data input/output. EDIO is the serial EEPROM data I/O signal that requires an external pullup (see

EEPROM data sheet) for EEPROM operation. Tying this terminal to ground disables the EEPROM interface

and prevents auto-configuration.

LED activity interface

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

LEDCLK

AC20

LED clock. LEDCLK is the serial-shift clock for the LED-status data.

LEDDATA

AD20

LED data. LEDDATA is the active-low serial data signal for the LED-status data.

LEDSTR0

AE20

LED strobe (port status). One LEDCLK cycle after the end of port status valid data, LEDSTR0 pulses high

for one LEDCLK cycle.

LEDSTR1

AF20

LED strobe (transmit-queue status). One LEDCLK cycle after the end of transmit-queue status valid data,

LEDSTR1 pulses high for one LEDCLK cycle.

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