AM7968-125JC datasheet(76/127 Pages) AMD

76 / 127 page

AMD

TAXIchip Integrated Circuits Technical Manual

Figure 6-1

Transmitter and Receiver Decoupling Layouts

VCC1

(TTL)

VCC2

(ECL)

GND1

VCC3

(CML)

GND2

(CML)

Am7968

22 C1

Leads must

be very short

(less than 1/4

″)

C1 = 0.1

µF (ceramic)

C2 = 1

µF Tantalum

C3 = 0.01

µF (ceramic)

VCC Plane

GND1

VCC2

(CML)

GND2

Am7969

Transmitter

Receiver

To further decouple the TAXIchip set, it is highly recommended that ferrite beads be inserted

at locations A, B and D.

12330E-19

VCC Plane

VCC1

(TTL)

Figure 6-3

Jogs and Glitches in the Clock Line

Normal Overshoot < 0.5 V

CLK or X1

Jog or Glitch

Normal Undershoot < 0.5 V

12330E-20

3. Keep all bypass capacitors as close to the power pins of the device as possible. Lead

lengths should be minimized.

4. Use high quality RF grade capacitors such as type COG or X7R. Use of Z5U capaci-

tors is not recommended.

5. Ensure that the power supply does not have more that 100 mV of peak-to-peak noise

at any of the TAXI Vcc pins. Make this check while the TAXls are sending random

data.

6. While CLK can drive four X1 inputs or several TTL loads, the highest performance

can be achieved by reducing the load on the CLK pin. Care should be taken to en-

sure that no jogs or glitches occur in the CLK signal as shown in Figure 6-3. If pre-

sent, these glitches will be passed onto the PLL and cause an occasional error.

Serial Lines

7. Run serial outputs parallel to each other, or one on top of the other at all times and

route them away from the Transmitter. Do the same for serial inputs on the Receiver.

Running these serial traces adjacently will minimize noise caused by these extremely

fast signals on other traces. Use of strip lines for serial signals is recommended.

AM7968-125JC Datenblatt(PDF) 76 Page - Advanced Micro Devices

AM7968-125JC Datenblatt(HTML) 76 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