Advanced Micro Devices Am7996EVAL-HW Ethernet/Cheapernet Transceiver Evaluation Kit DISTINCTIVE CHARACTERISTICS ■ Connects the standard AUI port interface to 10BASE–2 (Cheapernet) connector. ■ Jumper selectable Signal Quality Error (SQE) test allows evaluation in both node and repeater applications. ■ Self contained board facilitates rapid evaluation of the AUI -to-coax system block, and demonstrates optimal analog design criteria. GENERAL DESCRIPTION The Am7996EVAL-HW board is a self contained module that implements all the functions of a Medium Attachment Unit (MAU) for IEEE 802.3 10BASE–2 (Cheapernet). This 3”x3” board can be used to connect any AUI port interface to the ‘thin’ coaxial cable used in Cheapernet networks. This system permits the network designer to monitor signals on the card to increase his understanding of IEEE 802.3 standards and conventions. A jumper selectable SQE test enable/disable lets the board function in both user node or network repeater applications. In addition, optimal PC board layout is employed. The Am7996EVAL-HW kit comes complete with schematics, application notes, and coaxial cable connection hardware. BLOCK DIAGRAM AUI Port Am7996 Cheapernet DC – DC Power Supply JUMPER SETTINGS The jumper settings specify the type of collision detect that is used. Transmit collision detect: connect 1 & 3 Receive collision detect: connect 1 & 2 3&4 Publication# 14606 3–4 Rev. B Issue Date: January 1992 Amendment/0 AMD CIRCUIT DIAGRAM 1 VCC1 1 16 2 CI+ COLL OSC 19 Collision 2 15 3 CI– A VCOL 18 m 7 17 NC 9 9 6 RXT 16 P2-2 P2-9 4 P2-5 P2-12 VCC2 20 4 13 Receive 5 5 12 R8 PE64102 or PE64107 7 10 Transmit 8 P2-10 9 174 1% W2 SQE DI– NC VCREF R10 7 SQ E 8 Test DO+ R9 9 DO– 40.2 1% P2-3 6 DI+ R4 5% 1.1 kΩ 33 pF C5 RMC TMC 1 3 4 499 Ω R2 RMC R1 150 kΩ 2 CL 24.9 kΩ 0.1 µF C1 15 Tap 14 Shield 13 R7 9.09 1% VTX– C2 0.1 µF P1 R5 75 K 1% C3 BNC Connector C4 150 pF CR2 CR1 IN4001 IN4150 TXT 12 R6 9.09 1% 40.2 1% 10 V EE VTX+ 11 –9 V *DC – DC Converter P2-13 +IN C7 P2-6 P2-1 +4.7 µF 25 V –OUT C6 0.1 µF +12 V –IN n/c –9 V C9 0.1 µF C8 +4.7 µF +OUT C10 1500 pF 3 KV P2-4 P2-8 P2-11 P2-14 Notes: CL = Effective Parasitic Capacitance C3 = 1/3 CL (PC Trace was Used for C3) RMC = Receive Mode Collision Detection (R1, R2, and C2 are needed for RMC Function) Jumper 1 to 2 and 3 to 4 TMC = Transmit Mode Collision Detection Jumper 1 to 3, open 2 and 4 R8 = 0 (Short) DC – DC CONVERTER PINOUT DC/DC Converters Input = +12 V Output = –9 V +IN –IN +OUT –OUT 1 2 4 5 1, 2 23, 24 11, 12 9, 10 Reliability INC. 2E12R9 Pulse Engineering PE64540 Am7996EVAL-HW 3–5