DP83916 datasheet(84/96 Pages) NSC

tên linh kiện	DP83916

Giải thích chi tiết về linh kiện	SONICTM-16 Systems-Oriented Network Interface Controller

PDF	96 Pages

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nhà sản xuất	NSC [National Semiconductor (TI)]

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84 / 96 page

70 AC and DC Specifications (Continued)

BUS RETRY

TLF11722 – 71

Number

Parameter

20 MHz

Units

Min

Max

T41

Bus Retry Synchronous Setup Time to BSCK

5ns

(Note 3)

T41a

Bus Retry Asynchronous

5ns

Setup Time to BSCK (Note 3)

T42

Bus Retry Hold Time from BSCK (Note 2)

T43

BSCK to HOLD High (Note 1)

T44

BSCK to HOLD Low (Note 1)

T47

BSCK to BR Low

T50

BSCK to BGACK High (Note 4)

Note 1

Depending upon the mode the SONIC-16 will assert and deassert HOLD from the rising or falling edge of BSCK

Note 2

Unless Latched Bus Retry mode is set (LBR in the Data Configuration Register Section 432) BRT must remain asserted until after the Th state If

Latched Bus Retry mode is used BRT does not need to satisfy T42

Note 3

T41 is for synchronous bus retry and T41a is for asynchronous bus retry (see Section 432 bit 15 Extended Bus Mode) Since T41a is an asynchronous

setup time it is not necessary to meet it but doing so will guarantee that the bus exception occurs in the current memory transfer not the next

Note 4

BGACK is driven high for approximately

BSCK before going TRI-STATE

DP83916 bảng dữ liệu(PDF) 84 Page - National Semiconductor (TI)