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    參數(shù)資料
    型號: ISP1561
    廠商: NXP Semiconductors N.V.
    英文描述: ISP1561BM
    中文描述: ISP1561BM
    文件頁數(shù): 17/102頁
    文件大?。?/td> 2875K
    代理商: ISP1561
    Philips Semiconductors
    ISP1561
    USB PCI host controller
    Product data
    Rev. 01 — 06 February 2003
    17 of 102
    9397 750 10015
    Koninklijke Philips Electronics N.V. 2003. All rights reserved.
    Command register (address: 04H):
    This is a two-byte register that provides coarse
    control over the ability of a device to generate and respond to PCI cycles. The bit
    allocation of the Command register is given in
    Table 6
    . When logic 0 is written to this
    register, the device is logically disconnected from the PCI bus for all accesses except
    configuration accesses. All devices are required to support this base level of
    functionality. Individual bits in the Command register may or may not support this
    base level of functionality.
    Table 6:
    Bit
    Symbol
    Reset
    Access
    Bit
    Symbol
    Reset
    Access
    Command register: bit allocation
    15
    14
    13
    12
    11
    10
    9
    8
    reserved
    FBBE
    0
    R/W
    1
    MS
    0
    R/W
    SERRE
    0
    R/W
    0
    IOS
    0
    R/W
    0
    -
    7
    0
    -
    6
    0
    -
    5
    0
    -
    4
    0
    -
    3
    0
    -
    2
    SCTRL
    0
    R
    PER
    0
    R/W
    VGAPS
    0
    R
    MWIE
    0
    R/W
    SC
    0
    R
    BM
    0
    R/W
    Table 7:
    Bit
    15 to 10
    9
    Command register: bit description
    Symbol
    Description
    -
    reserved
    FBBE
    Fast Back-to-Back Enable:
    This bit controls whether or not a
    master can do fast back-to-back transactions to different devices.
    The initialization software needs to set this bit if all targets are fast
    back-to-back capable.
    0 —
    fast back-to-back transactions are only allowed to the same
    agent (value after RST#)
    1 —
    the master is allowed to generate fast back-to-back
    transactions to different agents
    SERR# Enable
    : This bit is an enable bit for the SERR# driver. All
    devices that have an SERR# pin must implement this bit. Address
    parity errors are reported only if this bit and the PER bit are logic 1.
    8
    SERRE
    0 —
    disable the SERR# driver
    1 —
    enable the SERR# driver
    Stepping Control
    : This bit is used to control whether or not a
    device does address and data stepping. Devices that never do
    stepping must clear this bit. Devices that always do stepping must
    set this bit. Devices that can do either, must make this bit
    read/write and have it initialize to logic 1 after RST#.
    Parity Error Response
    : This bit controls the response of a device
    to parity errors. When the bit is set, the device must take its normal
    action when a parity error is detected. When the bit is logic 0, the
    device sets its Detected Parity Error status bit (bit 15 in the Status
    register) when an error is detected, but does not assert PERR#
    and continues normal operation. The state of this bit after RST# is
    logic 0. Devices that check parity must implement this bit. Devices
    are required to generate parity even if parity checking is disabled.
    7
    SCTRL
    6
    PER
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