ST20-GP6 datasheet(108/123 Pages) STMICROELECTRONICS

номер детали	ST20-GP6

подробное описание детали	GPS PROCESSOR

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ST20-GP6

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20 Timing speciﬁcations

20.1 EMI timings

The ‘Reference Clock’ used in the EMI timings is a virtual clock and is deﬁned as the point at which

all EMI strobe and address outputs programmed to change at the start of a memory cycle have

become valid. This is designed to remove process dependent skews from the datasheet descrip-

tion and highlight the dominant inﬂuence of address and strobe timings on memory system design.

Table 20.1 EMI cycle timings

Notes:

MemReadnotWrite strobe — not applicable as it does not change state mid cycle.

Timed relative to the end of the access cycle. There could be many clocks in the access

cycle, and the strobes may be programmed to go inactive at a previous clock cycle.

Symbol Parameter

Min

Max

Units Notes

tCHAV

Reference clock high to Address valid

-9

tCLSV

Reference clock low to Strobe valid

-11

tCHSV

Reference clock high to Strobe valid

-9

tRDVCH

Read Data valid to Reference clock high

tCHRDX

Read Data hold after Reference clock high

tSVRDX

Read Data hold after Strobe valid

tCHWDV

Reference clock high to Write Data valid

tWVCH

MemWait valid to Reference clock high

tCHWX

MemWait hold after Reference clock high

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