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USS-820FD

USB Device Controller

Agere -> LSI Corporation 

USS-820FD

USB Device Controller

Data Sheet, Rev. 1

August 2004

Register Timing Characteristics (continued)

Table 6. Register Access Timing—Special Function Register (SFR) Write

Symbol

Parameter

Min

Unit

tWRASU Write Address Setup Time. Starts before the trailing edge of WRN or

60

ns

IOCSN, whichever is first.

tWRAHD Write Address Hold. Starts after the trailing edge of WRN or IOCSN,

−10

ns

whichever is first.

tWRPW Write Minimum Pulse Width. From the leading edge of WRN or IOCSN, 23

ns

whichever is last, to the trailing edge of WRN or IOCSN, whichever is

first.

tWRDSU

Write Data Setup. From data valid to the trailing edge of WRN or

IOCSN, whichever is first.

60

ns

tWRDHD Write Data Hold. From the trailing edge of WRN or IOCSN, whichever is −10

ns

first, to data not valid.

tWRREC Recovery Time Between Write Attempts. From the trailing edge of

23

ns

WRN or IOCSN, whichever is first, to the next leading edge of WRN or

IOCSN, whichever is last.

tWRRECC Recovery Time Between Write Completes. From the trailing edge of

86

ns

WRN or IOCSN, whichever is first, to the next trailing edge of WRN or

IOCSN, whichever is first.

IOCSN

WRN

A

D

tWRPW

tWRRECC

tWRREC

tWRASU

VALID

tWRAHD

tWRDSU

VALID

tWRDHD

Figure 6. Register Access Timing—SFR Write

VALID

VALID

5-5353

10

Agere Systems Inc.

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