TNETX3151PGV datasheet(10/65 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

Terminal Functions (Continued)

host DIO interface

TERMINAL

I/O

INTERNAL

DESCRIPTION

NAME

NO.

I/O

RESISTOR

DESCRIPTION

SAD1

SAD0

143

142

Pullup

DIO address bus. SAD1 and SAD0 select the internal host registers, when SDMA is high.

SCS

138

Pullup

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

SDMA

123

Pullup

DIO DMA select. When low, SDMA modifies the behavior of the DIO interface to allow it to operate

with an external DMA controller. The SAD0 and SAD1 terminals are not used to select the internal

host register for the access. Instead, the DIO address to access is provided by the DMAaddress

Syscontrol register.

– If DMAinc = 1, accesses are the DIOdatainc register and DMAaddress register increments

after each access.

– If DMAinc = 0, accesses are the DIOdata register, and DMAaddress register does not

increment after each address.

SDATA7

SDATA6

SDATA5

SDATA4

SDATA3

SDATA2

SDATA1

SDATA0

136

135

133

131

130

129

127

126

I/O

Pullup

DIO data interface bus (byte-wide bidirectional DIO port). SDATA7 is the most significant bit and

SDATA0 is the least significant bit.

SINT

140

None

DIO interrupt line (interrupt to the attached microprocessor). The interrupt originating event is

stored in the Int register.

SRDY

139

Pullup

DIO ready signal

– When low during reads, SRDY indicates to the host when data is valid to be read.

– When low during writes, SRDY indicates when data has been received. After SCS is taken

high, SRDY is driven high for one clock cycle before placing the output in high impedance.

SRNW

125

Pullup

DIO read not write

– When high, read operation is selected.

– When low, write operation is selected.

SRXRDY

145

None

Network management port, receive ready. When high, SRXRDY indicates that the network

management port’s RX buffers are empty and the network management port is able to receive

a frame.

STXRDY

144

None

Network management port, transmit ready. STXRDY indicates that at least one frame buffer is

available to be read by the management CPU.

– It outputs as a 1 if any of the end-of-frame (eof) bits, start-of-frame (sof) bits, or one of the

bits in NMTxcontrol is set to 1.

– Otherwise, it outputs 0.

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