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| PMC-Sierra, Inc. PM5948 DART BOARD Reference Design Errata PMC-970631 ISSUE 2 S/UNI-DUAL ATM REFERENCE TRANSCEIVER BOARD S/UNI- TM 155-DUAL PM5948 DART BOARD S/UNI-DUAL ATM REFERENCE TRANSCEIVER BOARD ERRATA Issue 2: July 1997 PMC-Sierra, Inc. 105 - 8555 Baxter Place Burnaby, BC Canada V5A 4V7 (604) 415-6000 PMC-Sierra, Inc. PM5948 DART BOARD Reference Design Errata PMC-970631 ISSUE 2 S/UNI-DUAL ATM REFERENCE TRANSCEIVER BOARD PMC-Sierra, Inc. 105 - 8555 Baxter Place Burnaby, BC Canada V5A 4V7 (604) 415-6000 PMC-Sierra, Inc. PM5948 DART BOARD Reference Design Errata PMC-970631 ISSUE 2 S/UNI-DUAL ATM REFERENCE TRANSCEIVER BOARD CONTENTS: NEW ISSUE OF THE ERRATA FOR THE DART BOARD ......................................... 1 REFERENCES ........................................................................................................... 1 SUMMARY OF CHANGES......................................................................................... 2 FILTER CIRCUIT FOR ANALOG POWER PINS OF PM5348 ........................... 2 FILTER CIRCUIT FOR 19.44MHZ OSCILLATOR POWER SUPPLY ................ 3 TERMINATING UNUSED JTAG PINS ............................................................... 4 CONNECT PIN 89 OF S/UNI-DUAL TO GROUND............................................ 4 R1AVDQ3 AND R2AVDQ3 DON'T REQUIRE FILTERING................................ 4 CONTACTING PMC-SIERRA .................................................................................... 5 i PMC-Sierra, Inc. PM5948 DART BOARD Reference Design Errata PMC-970631 ISSUE 2 S/UNI-DUAL ATM REFERENCE TRANSCEIVER BOARD NEW ISSUE OF THE ERRATA FOR THE DART BOARD This document is the errata notice for the Issue 1 of the S/UNI-DUAL reference design, DART BOARD, PM5948, document Number PMC-960552. This Issue 2 errata notice supersedes all prior editions and prior versions of errata notices. REFERENCES * PM5948, DART BOARD, S/UNI-DUAL Reference Transceiver Board, PMC-960552 * PM5348, S/UNI-DUAL, PMC-950919 1 PMC-Sierra, Inc. PM5948 DART BOARD Reference Design Errata PMC-970631 ISSUE 2 S/UNI-DUAL ATM REFERENCE TRANSCEIVER BOARD SUMMARY OF CHANGES Filter Circuit for Analog Power Pins of PM5348 We have found that it may be desirable to include a low frequency power supply filter circuit, especially if powered by a switching power supply. This circuit is recommended to reduce noise seen by the S/UNI-DUAL analog power pins TAVD1, TAVD2, R1AVD1, R1AVD2, R2AVD1, and R2AVD2. All the other power pins must be de-coupled as recommended in the reference design schematic as per document PMC-960552 (R1). The final analog power supply filter circuit should looks like fig. 1 below. Optional ferrites may be used in series with each 2.7ohm resistor to reduce EMI. The recommended ferrites are made by Fair-Rite Corporation, P.N.# 2743019447. Fig.1: 2.7 0.1 F 10 3 TA V D 1 + 4.7 F 10 2 TA V S 1 2.7 10 4 TA V D 2 + 4.7 F 0.1 F 10 5 TA V S 2 V cc +5V 2.7 + 11 4 + 4.7 F 2.7 0.1 F 11 5 12 0 R 1A V S 1 S /U N I-D U A L 10 0 F + 4.7 F 2.7 0.1 F PM 5348 12 2 R 1A V S 2 87 + 4.7 F 2.7 4.7 F o r larg e r = Tan ta lu m , 1 0V 4.7 F 2.7 = 1/10 W 0.1 F = X7R cera m ic (clo se to p o wer p in s) 0.1 F R 2A V S 1 86 81 + 0.1 F 79 R 2A V S 2 2 PMC-Sierra, Inc. PM5948 DART BOARD Reference Design Errata PMC-970631 ISSUE 2 S/UNI-DUAL ATM REFERENCE TRANSCEIVER BOARD The original schematic on page 4 of 10 of Appendix F of PMC-960552 must be modified as follows: 1) Replace the ferrites L3, 4, 7, 8, 18 and L9 with a 2.7 resistor. 2) Replace the 1.0F capacitor C89 with a 4.7F or larger , 10V Tantalum. 3) Replace capacitors 0.1F C80, 81, 91, 95 & C96 with a 4.7F or larger , 10V Tantalum. 4) Replace 0.01F capacitors, C2, 15, 19, 22, 88 and C82 with a 0.1F X7R ceramic. Make sure that in the final version, the 0.1F ceramic capacitors are close to the IC pins. The 2.7 resistors can be low power 1/10 W. Filter Circuit for 19.44MHz Oscillator Power Supply Oscillators are susceptible to noise on their power supply pins. The following change is recommended especially if powered by a switching power supply.The original schematic on page 1 of 10 in Appendix F of the PMC-960552 must be modified as follows: 1) Replace L32 with a 1.0 resistor. 2) Replace 0.1F capacitor C157 with a 4.7F or larger, 10V Tantalum. 3) Replace 0.01F capacitor, C148 with a 0.1F X7R Ceramic. Make sure the 0.1F capacitors are close to the IC pins. The 1.0 resistor can be low a power 1/10 watt. The final power supply low pass circuit is shown below in fig. 2: Fig.2: V cc +5V 1.0 V cc + + 4.7 F 0.1 F V ss 10 0 F 4.7 F o r larg e r = Ta n ta lum , 1 0V 2.7 = 1/10 W R esistor 0.1 F = X7R ce ram ic, m ount close to the p ower p ins 19.44 M H z R eference O scilator 3 PMC-Sierra, Inc. PM5948 DART BOARD Reference Design Errata PMC-970631 ISSUE 2 S/UNI-DUAL ATM REFERENCE TRANSCEIVER BOARD Terminating unused JTAG pins Since pins TMS and TDI have internal pull-ups, and TDO is an output, the original schematic on page 3 and 5 of 10 in Appendix F of the PMC-960552 must be modified as follows: 1) Delete R30, R31, R32, R35, R36 and R37. Connect Pin 89 of S/UNI-DUAL to ground Pin 89 of the S/UNI-DUAL, PM5348 acts a guard pin for the TXD2+, pin 90. Pin 89 is not connected internally. This pin should be connected to ground as per the Issue 6 Data sheet PMC-950716. Modify the Schematics of Appendix F, as follows: 1) On page 5 of 10 connect pin 89 of U3 to ground. 2) On page 3 of 10, connect pin 89 of U2 to ground. R1AVDQ3 and R2AVDQ3 don't require filtering R1AVDQ3 pin 106 and R2AVDQ3 pin 93 on Revision D S/UNI-DUAL parts are used as shields and don't require special power filtering like the other analog power pins. These two pins can be connected directly to a relatively quiet +5 volt DC supply. The original schematic on page 4 of 10 in Appendix F of the PMC-960552 must be modified as follows: 1) Replace the ferrites L6, and L19 with a short. 2) Delete capacitors C85, 86, 90, and C93. 4 PMC-Sierra, Inc. PM5948 DART BOARD Reference Design Errata PMC-970631 ISSUE 2 S/UNI-DUAL ATM REFERENCE TRANSCEIVER BOARD CONTACTING PMC-SIERRA PMC-Sierra, Inc. 105-8555 Baxter Place Burnaby, BC Canada V5A 4V7 Tel: Fax: (604) 415-6000 (604) 415-6200 document@pmc-sierra.com info@pmc-sierra.com apps@pmc-sierra.com http://www.pmc-sierra.com Document Information: Corporate Information: Applications Information: Web Site: Seller will have no obligation or liability in respect of defects or damage caused by unauthorized use, mis-use, accident, external cause, installation error, or normal wear and tear. There are no warranties, representations or guarantees of any kind, either express or implied by law or custom, regarding the product or its performance, including those regarding quality, merchantability, fitness for purpose, condition, design, title, infringement of thirdparty rights, or conformance with sample. Seller shall not be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon, the information contained in this document. In no event will Seller be liable to Buyer or to any other party for loss of profits, loss of savings, or punitive, exemplary, incidental, consequential or special damages, even if Seller has knowledge of the possibility of such potential loss or damage and even if caused by Seller's negligence. (c) 1997 PMC-Sierra, Inc. PMC-970631 (R2) ref PMC-960552(R1) Issue date: July 1997. PMC-Sierra, Inc. 105 - 8555 Baxter Place Burnaby, BC Canada V5A 4V7 (604) 415-6000 |
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