CY7C964A [CYPRESS]
Bus Interface Logic Circuit; 总线接口逻辑电路
| 型号： | CY7C964A |
| 厂家： | 
CYPRESS |
| 描述： | Bus Interface Logic Circuit |
| 文件： | 总6页 (文件大小：159K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PRELIMINARY
CY7C964A
Bus Interface Logic Circuit
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.
Features
• Comparators, counters, latches, and drivers minimize
logic requirements for a variety of multiplexed and
non-multiplexed buses
Application with VMEbus Architecture
• 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 com-
ponents
• Replaces multiple SSI/MSI components
• Cascadable
• 64-pin QFP
Use with Cypress VMEbus Controllers
The CY7C964A Bus Interface Logic Circuit is a seamless in-
terface 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 de-
vice 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 mul-
tiplexing logic to allow the 64-bit-wide VMEbus path to be fun-
nelled to and from the 32-bit local bus. Control circuitry is in-
cluded 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).
• See the VMEbus Interface Handbook for more informa-
tion
Functional Description
The CY7C964A integrates severalspace-consumingfunctions
into one small package, freeing board space for the implemen-
tation 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 driv-
ers are suitable for driving the VMEbus directly. The
CY7C964A is ideal in applications where high-performance
and real estate are primary concerns.
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 gener-
al-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.
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
PQFP/CQFP/TQFP
Top View
48
GND
LD0
LA0
GND
LD7
1
2
47
46
45
3
4
LDS
FC1
STROBE*
DENIN*
DENIN1*
LAEN
44
43
42
41
5
6
MWB*
LCOUT*
GND
VCOMP*
VCOUT*
LADO
LADI
LEDI
LEDO
A7
7
LCIN*
VCIN*
VCC
BLT*
D64
8
9
10
11
12
40
39
38
37
36
35
34
33
DENO*
ABEN*
D0
13
14
15
A0
16
GND
GND
C964A-1
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
Document #: 38-09001 Rev. *A
Revised June 12, 2001
CY7C964A
with mask register, or more complex functions such as 16-to-8
pipelined bidirectional multiplexer with address counter/com-
parator circuitry. The device can be cascaded to generate
counters and comparators suitable for multiple byte ad-
dress/data buses. The on-chip 48 mA drivers can be directly
connected to many standard backplane buses.
Application with Other Bus Architectures
The CY7C964A is optimized for applications requiring wide
buffers and high-performance multiplexing operations. The ar-
chitecture can be configured to provide functions such as
16-bit bidirectional three-state latch and 16-bit comparator
Ordering Information
Package
Operating
Ordering Code
CY7C964A–ASC
Name
Package Type
Range
A64
64-Pin Thin Quad Flatpack
64-Pin Plastic Quad Flatpack
64-Pin Ceramic Quad Flatpack
64-Pin Ceramic Quad Flatpack
Commercial
CY7C964A–NC
CY7C964A–UM
CY7C964A–UMB
N65
U65
U65
Military
Related Documents
VMEbus Interface Handbook
Document #: 38-09001 Rev. *A
Page2of6
CY7C964A
Package Diagrams
64-Pin Thin Quad Flatpack A64
Document #: 38-09001 Rev. *A
Page3of6
CY7C964A
Package Diagrams (continued)
64-Lead Plastic Thin Quad Flatpack N65
Document #: 38-09001 Rev. *A
Page4of6
CY7C964A
Package Diagrams (continued)
64-Lead Ceramic Quad Flatpack (Cavity Up) U65
Document #: 38-09001 Rev. *A
Page5of6
© 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.
**
ECN NO.
106236
107043
Issue Date
04/20/01
06/12/01
Orig. of Change
Description of Change
SZV
KBN
Change from Spec number: 38-00197 to 38-09001
*A
Change from CY7C964 to CY7C964A; removed GMB and
GM packages
Document #: 38-09001 Rev. *A
Page6of6
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