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DP83256VF bảng dữ liệu(PDF) 76 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DP83256VF
Giải thích chi tiết về linh kiện  PLAYERa??Device (FDDI Physical Layer Controller)
PDF  144 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83256VF bảng dữ liệu(HTML) 76 Page - National Semiconductor (TI)

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50 Registers (Continued)
532 CMT CONDITION COMPARISON REGISTER (CMTCCR)
The CMT Condition Comparison Register (CMTCR) ensures that the Control Bus must first read a bit modified by the PLAYERa
device before it can be written to by the Control Bus Interface
The current state of the CMT Condition Register (CMTCR) is automatically written into the CMT Condition Comparison Register
(CMTCR) (ie CMTCCR e CMTCR) during a Control Bus Interface read-cycle of CMTCR
During a Control Bus Interface write cycle the PLAYERa device will set the Conditional Write Inhibit bit (CWI) of the Interrupt
Control Register (ICR) to 1 and disallow the setting or clearing of a bit within the CMTCR when the value of a bit in the CMTCR
differs from the value of the corresponding bit in the CMT Condition Comparison Register
ACCESS RULES
ADDRESS
READ
WRITE
1Fh
Always
Always
D7
D6
D5
D4
D3
D2
D1
D0
TCOC
STEC
RES
RES
RES
RES
RES
RES
Bit
Symbol
Description
D0-D5
RES
RESERVED
Reserved for future use
D6
STEC
SCRUB TIMER EXPIRED COMPARISON
The comparison bit for the Scrub Timer Expire bit (STE) of the CMT
Condition Register (CMTCR)
D7
TCOC
TRIGGER CONDITION OCCURRED COMPARISON
The comparison bit for the Trigger Condition Occurred
(TCO) bit of the CMT Condition Register (CMTCR)
76



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