AM7968 datasheet(81/127 Pages) AMD

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AMD

TAXIchip Integrated Circuits Technical Manual

Figure 7-2

Cascade with One TAXI Transmitter

DFF

BUFFERS

OE-

BUFFERS

74ALS374

BYTE1

BYTE2

BYTE3

BYTE4

CLK

STRB

SEROUT

ACK

DATA

COMMAND

LOADEN

CLK2

LOAD4-

LOAD3-

LOAD2-

LOAD1-

74LS174

STRBIN

DATA

STROBE

ACK0

ACK1

CLK1

SEROUT

CLK Buffer;

May Not Be

Required for

Low Fanout

System

Four-Byte Cascade Mode Logic

TAXI

12330E-24

7.2 Receivers In Cascade Mode: Connections (Am7969-125 Only)

Unlike transmitters, all cascaded receivers are directly connected to the media, via the

two serial input data lines. All Receivers see the same serial data at the same time. The

Primary Receiver always receives the first byte of serial data after a Sync. The signals

used by the upstream Receiver to tell the downstream Receiver that it has captured a

byte are IGM (I Got Mine) and CNB (Catch Next Byte). After receiving its byte, the

upstream receiver raises its IGM signal, telling the next Receiver in line that it is to catch

the next byte on the serial line. In this way each succeeding Receiver down the line

catches each succeeding byte.

The second receiver waits for the Primary Receiver to capture data before capturing its

data (the second byte). Similarly, if there were a third Receiver it would wait until the

second Receiver had captured the second byte before capturing the third byte.

The connections of the cascaded (downstream) TAXI Receivers are as follows (see

Figure 7-3):

The CNB input of the cascaded Receiver is tied to the IGM of it’s upstream neighbor.

The CNB input of the first upstream or primary Receiver is tied high.

The IGM output of the last downstream Receiver is left unconnected normally. (This pin

is used differently in Auto-repeat Configuration, discussed in section 7.3).

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