AM7968 datasheet(89/127 Pages) AMD

89 / 127 page

AMD

TAXIchip Integrated Circuits Technical Manual

output data at the same time This also guarantees that the CNB on the first Receiver

goes active (HIGH) within 2 gate delays + 20 ns after it goes LOW. This leaves enough

time for the first Receiver to capture the (R+1)th byte of data.

Figure 7-10

TAXI Receiver—Cascaded In Auto-Repeat Configuration.

Configuration 2

12330E-32

CNB

IGM

CNB

IGM

CNB

IGM

CNB

IGM

SERIN +

SERIN -

Figure 7-11

TAXI Receiver—Cascaded in Auto-Repeat Configuration.

Configuration 3

SERIN+

SERIN–

CNB

IGM

DSTRB

CSTRB

CNB

IGM

DSTRB

CSTRB

CNB

IGM

DSTRB

CSTRB

CNB

IGM

DSTRB

CSTRB

12330E-33

In practice, all the AND gates are not required. Using the above equation for X we can

calculate a value of R1 for which X is less than 1 byte period at the appropriate fre-

quency of operation. Then if the number of receivers to be cascaded is greater than R1,

an AND gate is needed for every (R1+1)th Receiver in cascade. The other receivers can

be directly connected as shown in Figure 7-11.

Syncs in Auto-Repeat Configuration and Recovering from Errors

A Sync in Auto-Repeat Configuration acts much like a Sync in Normal Cascade mode. It

resets all the Receivers and their IGMs so the upstream (Primary) Receiver receives the

next non Sync byte of data. This remains as the method of recovering from byte framing

errors.

7.4 Unbalanced Configuration (Am7968/Am7969-125 Only)

In reality there is no difference in connection between balanced and Unbalanced

Configurations. The name only indicates that the number of Transmit bytes and the

number of Receive bytes are unequal.

The TAXI Receivers do not care how many data bytes the Transmitter is sending to

them. One data byte can be transmitted to several Receivers. The only limitation here is

AM7968 Datenblatt(PDF) 89 Page - Advanced Micro Devices

AM7968 Datenblatt(HTML) 89 Page - Advanced Micro Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datenblatt Download

Link URL