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  • 參數(shù)資料
    型號(hào): CY7C0851AV-133AXI
    廠商: CYPRESS SEMICONDUCTOR CORP
    元件分類: SRAM
    英文描述: FLEx36&#153; 3.3V 32K/64K/128K/256K x 36 Synchronous Dual-Port RAM
    中文描述: 64K X 36 DUAL-PORT SRAM, 4 ns, PQFP176
    封裝: 24 X 24 MM, 1.40 MM HEIGHT, LEAD FREE, TQFP-176
    文件頁數(shù): 5/36頁
    文件大?。?/td> 956K
    代理商: CY7C0851AV-133AXI
    CY7C0850AV,CY7C0851V/CY7C0851AV
    CY7C0852V/CY7C0852AV
    CY7C0853V/CY7C0853AV
    Document #: 38-06070 Rev. *J
    Page 13 of 36
    IEEE 1149.1 Serial Boundary Scan (JTAG) [17]
    The CY7C0850AV / CY7C0851V / CY7C0851AV / CY7C0852V
    /CY7C0852AV / CY7C0853V / CY7C0853AV incorporates an
    IEEE 1149.1 serial boundary scan test access port (TAP). The
    TAP controller functions in a manner that does not conflict with
    the operation of other devices using 1149.1-compliant TAPs. The
    TAP operates using JEDEC-standard 3.3 V I/O logic levels. It is
    composed of three input connections and one output connection
    required by the test logic defined by the standard.
    Performing a TAP Reset
    A reset is performed by forcing TMS HIGH (VDD) for five rising
    edges of TCK. This reset does not affect the operation of the
    devices, and may be performed while the devices are operating.
    An MRST must be performed on the devices after power-up.
    Performing a Pause/Restart
    When a SHIFT-DR PAUSE-DR SHIFT-DR is performed the scan
    chain outputs the next bit in the chain twice. For example, if the
    value expected from the chain is 1010101, the device outputs a
    11010101. This extra bit causes some testers to report an
    erroneous failure for the devices in a scan test. Therefore the
    tester should be configured to never enter the PAUSE-DR state.
    Table 4. Identification Register Definitions
    Instruction Field
    Value
    Description
    Revision number (31:28)
    0h
    Reserved for version number.
    Cypress device ID (27:12)
    C001h
    Defines Cypress part number for the CY7C0851V/0851AV
    C002h
    Defines Cypress part number for the CY7C0852V/0852AV and
    CY7C0853V/0853AV
    C092h
    Defines Cypress part number for the CY7C0850AV
    Cypress JEDEC ID (11:1)
    034h
    Allows unique identification of the DP family device vendor.
    ID register presence (0)
    1
    Indicates the presence of an ID register.
    Table 5. Scan Registers Sizes
    Register Name
    Bit Size
    Instruction
    4
    Bypass
    1
    Identification
    32
    Boundary Scan
    Table 6. Instruction Identification Codes
    Instruction
    Code
    Description
    EXTEST
    0000
    Captures the Input/Output ring contents. Places the BSR between the TDI and TDO.
    BYPASS
    1111
    Places the BYR between TDI and TDO.
    IDCODE
    1011
    Loads the IDR with the vendor ID code and places the register between TDI and TDO.
    HIGHZ
    0111
    Places BYR between TDI and TDO. Forces all CY7C0851AV/CY7C0852AV/
    CY7C0853AV output drivers to a High-Z state.
    CLAMP
    0100
    Controls boundary to 1/0. Places BYR between TDI and TDO.
    SAMPLE/PRELOAD
    1000
    Captures the input/output ring contents. Places BSR between TDI and TDO.
    NBSRST
    1100
    Resets the non-boundary scan logic. Places BYR between TDI and TDO.
    RESERVED
    All other codes Other combinations are reserved. Do not use other than the above.
    Notes
    17. Boundary scan is IEEE 1149.1-compatible. See “Performing a Pause/Restart” for deviation from strict 1149.1 compliance.
    18. See details in the device BSDL files.
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