DSP1620/27/28/29 DSP1627/28/29 DSP1620 DS97-321WDSP DSP1627 DS96-188WDSP

May 1999 Clarification to the Serial I/O Control Register Description for the DSP1620/27/28/29 Devices Active Clock Frequency The

Advisory May 1999 Clarification to the Serial I/O Control Register Description for the DSP1620/27/28/29 DSP1620/27/28/29 Devices Active Clock Frequency The purpose of this advisory is to clarify the function of the serial I/O control registers in the DSP1620/27/28/29 DSP1620/27/28/29 devices. Specifically, it clarifies the function of the control register field that specifies the active clock frequency. The device data sheets state that the active clock frequency is a ratio of the input clock frequency on the CKI pin (DSP1627/28/29 DSP1627/28/29 devices) or the output clock frequency on the CKO pin (DSP1620 DSP1620 device). For all four devices, the actual active clock frequency is a ratio of the internal clock frequency, which can be programmed as either the input clock frequency on the CKI pin or the output of an internal clock synthesizer (PLL). Table 1 summarizes information for each of the four devices. It lists the document number for each device data sheet. For example, the data sheet for the DSP1620 DSP1620, entitled DSP1620 DSP1620 Digital Signal Processor, has the document number DS97-321WDSP DS97-321WDSP Table 1 also lists the name of each serial I/O unit on each device, the corre. sponding control register, the data sheet page number that describes the register, and the corresponding field within the register that specifies the active clock frequency. For example, the DSP1620 DSP1620 contains two serial I/O units named SIO and SSIO. The control register for SIO is sioc described on page 94 of the data sheet. Bits 8-7 within sioc (CLK1 field) specify the active clock frequency of the SIO. Table 1. Data Sheet and Serial I/O Information for the DSP1620/27/28/29 DSP1620/27/28/29 Devices Device Data Sheet Document Number DSP1620 DSP1620 DS97-321WDSP DS97-321WDSP DSP1627 DSP1627 DS96-188WDSP DS96-188WDSP DSP1628 DSP1628 DS97-040WDSP DS97-040WDSP DSP1629 DSP1629 DS96-039WDSP DS96-039WDSP Name Control Register SIO SSIO SIO SIO2 SIO SIO2 SIO SIO2 sioc SSIOC sioc Serial I/O Units Data Sheet Active Clock Frequency Page No. Control Field Bits Name 94 8-7 CLK1 96 8-7 CLK2 45 8-7 CLK sioc 55 8-7 CLK sioc 46 8-7 CLK Table 2 shows a corrected description of the CLK/CLK1/CLK2 field of the serial I/O control register. The specific correction is shown in bold type-the active clock frequency is a ratio of finternal clock, not of CKI or CKO. Table 2. Corrected Description of CLK/CLK1/CLK2 Field Field CLK CLK1 CLK2 Value 00 01 10 11 Description Active clock frequency = finternal clock ÷ 2 Active clock frequency = finternal clock ÷ 6 Active clock frequency = finternal clock ÷ 8 Active clock frequency = finternal clock ÷ 10 DRAFT COPY For additional information, contact your Microelectronics Group Account Manager or the following: http://www.lucent.com/micro INTERNET: docmaster@micro.lucent.com E-MAIL: N. AMERICA: Microelectronics Group, Lucent Technologies Inc., 555 Union Boulevard, Room 30L-15P-BA 30L-15P-BA, Allentown, PA 18103 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA PACIFIC: Microelectronics Group, Lucent Technologies Singapore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 118256 Tel. (65) 778 8833, FAX (65) 777 7495 CHINA: Microelectronics Group, Lucent Technologies (China) Co., Ltd., A-F2, 23/F, Zao Fong Universe Building, 1800 Zhong Shan Xi Road, Shanghai 200233 P. R. China Tel. (86) 21 6440 0468, ext. 316, FAX (86) 21 6440 0652 JAPAN: Microelectronics Group, Lucent Technologies Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700 EUROPE: Data Requests: MICROELECTRONICS GROUP DATALINE: Tel. (44) 1189 324 299, FAX (44) 1189 328 148 Technical Inquiries: GERMANY: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Ascot), FRANCE: (33) 1 40 83 68 00 (Paris), SWEDEN: (46) 8 594 607 00 (Stockholm), FINLAND: (358) 9 4354 2800 (Helsinki), ITALY: (39) 02 6608131 (Milan), SPAIN: (34) 1 807 1441 (Madrid) Lucent Technologies Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information. Copyright © 1999 Lucent Technologies Inc. All Rights Reserved May 1999 AY99-001WDSP AY99-001WDSP (must accompany DS97-321WDSP DS97-321WDSP DS96-188WDSP DS96-188WDSP DS97-040WDSP DS97-040WDSP and DS96-039WDSP DS96-039WDSP) , , , Preliminary Data Sheet February 1997 DSP1628 DSP1628 Digital Signal Processor 1 Features s s s s s s s s s s s s s s s s s s s s Optimized for digital cellular applications with a bit manipulation unit for higher coding efficiency and an error correction coprocessor for equalization and channel coding support. On-chip, programmable, PLL clock synthesizer. 19.2 ns and 12.5 ns instruction cycle times at 2.7 V. Mask-programmable memory map option: The DSP1628x16 features 16 Kwords on-chip dualport RAM. The DSP1628x08 features 8 Kwords on-chip dual-port RAM. Both feature 48 Kwords on-chip ROM with a secure option. Low power consumption: -