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    參數(shù)資料
    型號: OR2C12A-6BA304
    廠商: Electronic Theatre Controls, Inc.
    元件分類: FPGA
    英文描述: Field-Programmable Gate Arrays
    中文描述: 現(xiàn)場可編程門陣列
    文件頁數(shù): 143/192頁
    文件大小: 3148K
    代理商: OR2C12A-6BA304
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    54
    Lucent Technologies Inc.
    Data Sheet
    ORCA Series 2 FPGAs
    June 1999
    Special Function Blocks (continued)
    Boundary Scan
    The increasing complexity of integrated circuits (ICs)
    and IC packages has increased the difficulty of testing
    printed-circuit boards (PCBs). To address this testing
    problem, the
    IEEE standard 1149.1 - 1990 (IEEE Stan-
    dard Test Access Port and Boundary-Scan Architec-
    ture) is implemented in the
    ORCA series of FPGAs. It
    allows users to efficiently test the interconnection
    between integrated circuits on a PCB as well as test
    the integrated circuit itself. The
    IEEE 1149.1 standard
    is a well-defined protocol that ensures interoperability
    among boundary-scan (BSCAN) equipped devices
    from different vendors.
    The
    IEEE 1149.1 standard defines a test access port
    (TAP) that consists of a 4-pin interface with an optional
    reset pin for boundary-scan testing of integrated cir-
    cuits in a system. The
    ORCA series FPGA provides
    four interface pins: test data in (TDI), test mode select
    (TMS), test clock (TCK), and test data out (TDO). The
    PRGM
    pin used to reconfigure the device also resets
    the boundary-scan logic.
    The user test host serially loads test commands and
    test data into the FPGA through these pins to drive out-
    puts and examine inputs. In the configuration shown in
    Figure 47, where boundary scan is used to test ICs,
    test data is transmitted serially into TDI of the first
    BSCAN device (U1), through TDO/TDI connections
    between BSCAN devices (U2 and U3), and out TDO of
    the last BSCAN device (U4). In this configuration, the
    TMS and TCK signals are routed to all boundary-scan
    ICs in parallel so that all boundary-scan components
    operate in the same state. In other configurations, mul-
    tiple scan paths are used instead of a single ring. When
    multiple scan paths are used, each ring is indepen-
    dently controlled by its own TMS and TCK signals.
    Figure 48 provides a system interface for components
    used in the boundary-scan testing of PCBs. The three
    major components shown are the test host, boundary-
    scan support circuit, and the devices under test
    (DUTs). The DUTs shown here are
    ORCA Series
    FPGAs with dedicated boundary-scan circuitry. The
    test host is normally one of the following: automatic test
    equipment (ATE), a workstation, a PC, or a micropro-
    cessor.
    Fig.34.a(F).1C
    Key:
    BSC = boundary-scan cell, BDC = bidirectional data cell,
    and DCC = data control cell.
    Figure 47. Printed-Circuit Board with Boundary-
    Scan Circuitry
    The boundary-scan support circuit shown in Figure 48
    is the 497AA Boundary-Scan Master (BSM). The BSM
    off-loads tasks from the test host to increase test
    throughput. To interface between the test host and the
    DUTs, the BSM has a general microprocessor interface
    and provides parallel-to-serial/serial-to-parallel conver-
    sion, as well as three 8K data buffers.
    SCAN
    OUT
    TDI
    TMS
    TCK
    TDO
    U2
    SEE ENLARGED VIEW BELOW
    PLC
    ARRAY
    SCAN
    IN
    TDO TCK TMS TDI
    TAPC
    BYPASS
    REGISTER
    INSTRUCTION
    REGISTER
    BDC
    BSC
    P_IN
    P_OUT
    P_TS
    SCAN
    IN
    PT[ij]
    ENLARGED VIEW
    TDI
    TDO
    TMS
    TCK
    U1
    TDI
    TDO
    TMS
    TCK
    U4
    TDI
    TDO
    TMS
    TCK
    U3
    TDI
    TDO
    TMS
    TCK
    net a
    net b
    net c
    s
    DCC
    SCAN
    OUT
    DCC
    BSC
    P_IN
    P_OUT
    P_TS
    SCAN
    IN
    PB[ij]
    BDC
    SCAN
    OUT
    BDC
    BSC
    P_IN
    P_OUT
    P_TS
    PR[ij]
    DCC
    SCAN
    OUT
    BSC
    P_IN
    P_OUT
    P_TS
    PL[ij]
    SCAN
    IN
    DCC
    BDC
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