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| PRELIMINARY CY7C964A Bus Interface Logic Circuit Features * Comparators, counters, latches, and drivers minimize logic requirements for a variety of multiplexed and non-multiplexed buses * Directly drives VMEbus address and data signals * 8-bit comparator for slave address decoding * Flexible interface optimized for VMEbus applications * Companion device to Cypress VMEbus family of components * Replaces multiple SSI/MSI components * Cascadable * 64-pin QFP * See the VMEbus Interface Handbook for more information case, the controllers provide the control and timing signals to the Bus Interface Logic Circuit as it acts as a bridge between the VMEbus and the Local bus. Application with VMEbus Architecture Use with Cypress VMEbus Controllers The CY7C964A Bus Interface Logic Circuit is a seamless interface between the VIC068A/VIC64 and the VMEbus signals. The device functions equally well in the established 32-bit VMEbus arena and the new 64-bit VMEbus standard. The device contains three 8-bit counters to fulfill the functions of Block counters, and DMA counters as implied by the D64 portion of the VMEbus specification. It also contains the necessary multiplexing logic to allow the 64-bit-wide VMEbus path to be funnelled to and from the 32-bit local bus. Control circuitry is included to manage the switching of the 32-bit address bus during normal (32-bit) operations, and during MBLT (64-bit) operations. The on-chip drivers are capable of driving the VMEbus directly (48 mA). Use in Other VMEbus Controller Implementations The CY7C964A circuitry is designed to be of use to designers of VMEbus circuitry, including VSB (VME subsystem bus) and designs not requiring the features of the Cypress VIC068A, VIC64, and CY7C960A. The logic diagram includes general-purpose blocks of comparators, counters, and latches that can be controlled using the flexible control interface to allow many different options to be implemented. Although the device is offered in a small 64-pin package, the use of multiplexed input and output pins provides access to the many internal functions, thus saving external circuitry. Functional Description The CY7C964A integrates several space-consuming functions into one small package, freeing board space for the implementation of added-value board features. It contains counters, comparators, latches, and drivers configured to be of value to implementors of any backplane interface with address and data buses, particularly VMEbus interfaces. The on-chip drivers are suitable for driving the VMEbus directly. The CY7C964A is ideal in applications where high-performance and real estate are primary concerns. Although having many applications, the Bus Interface Logic Circuit is an ideal companion part to Cypress's VMEbus family of components, the VIC068A, VIC64, and the CY7C960A. It is intended to drive the address and data buses, so three or four of these small devices are needed per controller. In every Pin Configuration VCC LA7 LD6 LA6 LD5 LA5 LD4 LA4 GND LD3 LA3 LD2 LA2 LD1 LA1 VCC 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 PQFP/CQFP/TQFP Top View 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 GND LD7 LDS FC1 STROBE* MWB* LCOUT* GND VCOMP* VCOUT* LADO LADI LEDI LEDO A7 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 GND LD0 LA0 DENIN* DENIN1* LAEN LCIN* VCIN* VCC BLT* D64 DENO* ABEN* D0 A0 GND VCC Cypress Semiconductor Corporation Document #: 38-09001 Rev. *A * 3901 North First Street D7 A6 D6 A5 D5 A4 D4 GND A3 D3 A2 D2 A1 * D1 VCC C964A-1 San Jose * CA 95134 * 408-943-2600 Revised June 12, 2001 CY7C964A Application with Other Bus Architectures The CY7C964A is optimized for applications requiring wide buffers and high-performance multiplexing operations. The architecture can be configured to provide functions such as 16-bit bidirectional three-state latch and 16-bit comparator with mask register, or more complex functions such as 16-to-8 pipelined bidirectional multiplexer with address counter/comparator circuitry. The device can be cascaded to generate counters and comparators suitable for multiple byte address/data buses. The on-chip 48 mA drivers can be directly connected to many standard backplane buses. Ordering Information Ordering Code CY7C964A-ASC CY7C964A-NC CY7C964A-UM CY7C964A-UMB Package Name A64 N65 U65 U65 Package Type 64-Pin Thin Quad Flatpack 64-Pin Plastic Quad Flatpack 64-Pin Ceramic Quad Flatpack 64-Pin Ceramic Quad Flatpack Military Operating Range Commercial Related Documents VMEbus Interface Handbook Document #: 38-09001 Rev. *A Page 2 of 6 CY7C964A Package Diagrams 64-Pin Thin Quad Flatpack A64 Document #: 38-09001 Rev. *A Page 3 of 6 CY7C964A Package Diagrams (continued) 64-Lead Plastic Thin Quad Flatpack N65 Document #: 38-09001 Rev. *A Page 4 of 6 CY7C964A Package Diagrams (continued) 64-Lead Ceramic Quad Flatpack (Cavity Up) U65 Document #: 38-09001 Rev. *A Page 5 of 6 (c) Cypress Semiconductor Corporation, 1997. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges. CY7C964A Document Title: CY7C964A Bus Interface Logic Circuit Document Number: 38-09001 REV. ** *A ECN NO. 106236 107043 Issue Date 04/20/01 06/12/01 Orig. of Change SZV KBN Description of Change Change from Spec number: 38-00197 to 38-09001 Change from CY7C964 to CY7C964A; removed GMB and GM packages Document #: 38-09001 Rev. *A Page 6 of 6 |
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