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    參數(shù)資料
    型號(hào): HYB18T256324F-20
    廠商: INFINEON TECHNOLOGIES AG
    英文描述: 256-Mbit GDDR3 DRAM [600MHz]
    中文描述: 256兆GDDR3顯示內(nèi)存[600MHz的]
    文件頁數(shù): 20/80頁
    文件大?。?/td> 2026K
    代理商: HYB18T256324F-20
    HYB18T256324F–[16/20/22]
    256-Mbit DDR SGRAM
    Pin Configuration
    Data Sheet
    20
    Rev. 1.11, 04-2005
    10292004-DOXT-FS0U
    2.4.2
    If there is more than one bank activated in the Graphics
    SDRAM, some commands can be performed in parallel
    due to the chip’s multibank architecture. The following
    table defines for which commands such a scheme is
    possible. All other transitions are illegal. Notes 1-11
    define the start and end of the actions belonging to a
    Function Truth Table for more than one Activated Bank
    submitted command. This table is based on the
    assumption that there are no other actions ongoing on
    bank n or bank m. If there are any actions ongoing on a
    third bank t
    RRD
    , t
    RTW
    and t
    WTR
    have to be taken always
    into account.
    1. Action ACTIVATE starts with issuing the command
    and ends after t
    RCD
    2. Action WRITE starts with issuing the command and
    ends t
    WR
    after the first pos. edge of CLK following
    the last falling WDQS edge; exept for READ,
    READ/A. WRITE, WRITE/A ends
    t
    WTR
    after the first
    pos. edge of CLK following the last falling WDQS
    edge.
    3. Action WRITE/A starts with issuing the command
    and ends t
    WR
    after the first positive edge of CLK
    following the last falling WDQS edge; exept for
    READ, READ/A. WRITE, WRITE/A ends t
    WTR
    after
    the first pos. edge of CLK following the last falling
    WDQS edge.
    4. Action READ starts with issuing the command and
    ends with the first positive edge of CLK following the
    last falling edge of RDQS
    5. Action READ/A starts with issuing the command
    and ends with the first positive edge of CLK
    following the last falling edge of RDQS
    6. Action PRECHARGE and PRECHARGE ALL start
    with issuing the command and ends after t
    RP
    7. During POWER DOWN and SELF REFRESH only
    the EXIT commands are allowed
    8. Action AUTO REFRESH starts with issuing the
    command and ends after t
    RFC
    9. Actions MODE REGISTER SET and EXTENDED
    MODE REGISTER SET start with issuing the
    command and ends after t
    MRD
    10.Action POWER DOWN EXIT starts with issuing the
    command and ends after t
    XPN
    11.Action SELF REFRESH EXIT starts with issuing the
    command and ends after t
    XSC
    12.During action ACTIVATE an ACT command on
    another bank is allowed considering t
    RRD
    , a PRE
    command on another bank is allowed any time.
    WR, WR/A, RD and RD/A are always allowed.
    13.During action WRITE an ACT or a PRE command
    on another bank is allowed any time. A new WR or
    WR/A command on another bank must be
    separated by at least one NOP from the ongoing
    WRITE. RD or RD/A are not allowed before t
    WTR
    is
    met.
    Table 7
    Current
    State
    ACTIVE
    Function Truth Table I
    ongoing action on bank n
    possible action in parallel on bank m
    ACTIVATE
    1
    WRITE
    2
    WRITE/A
    3
    READ
    4
    READ/A
    5
    PRECHARGE
    6
    PRECHARGE ALL
    6
    POWER DOWN ENTRY
    7
    ACTIVATE
    1
    POWER DOWN ENTRY
    7
    AUTO REFRESH
    8
    SELF REFRESH ENTRY
    7
    MODE REGISTER SET (MRS)
    9
    EXTENDED MRS
    9
    POWER DOWN EXIT
    10
    SELF REFRESH EXIT
    11
    ACT, PRE, WRITE, WRITE/A, READ, READ/A
    12
    ACT, PRE, WRITE, WRITE/A, READ, READ/A
    13
    ACT, PRE, WRITE, WRITE/A, READ
    14
    ACT, PRE, WRITE, WRITE/A, READ, READ/A
    15
    ACT, PRE, WRITE, WRITE/A, READ, READ/A
    15
    ACT, PRE, WRITE, WRITE/A, READ, READ/A
    12
    -
    -
    ACT
    -
    -
    -
    -
    -
    -
    -
    IDLE
    POWER DOWN
    SELF REFRESH
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