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USS-820D

USB Device Controller

Agere -> LSI Corporation 

USS-820D

USB Device Controller

Data Sheet, Rev. 4

June 2001

Register Timing Characteristics (continued)

Table 4. Register Access Timing—Special Function Register (SFR) Read

Symbol

Parameter

Min Max Unit

tRDASU Read Address Setup Time (starts before the trailing edge of RDN 60

—

ns

or IOCSN, whichever is first)

tRDAHD Read Address Hold (starts after the trailing edge of RDN or

IOCSN, whichever is first):

Operational

−10

—

ns

Suspended

−1

—

ns

tRDDV1, Read Data Valid (from the leading edge of RDN or IOCSN or from

tRDDV2 address valid, whichever is last, to data valid):

Operational

—

74

ns

Suspended

—

33

ns

tRDDZ

Read Data to Z State (starts after the trailing edge of RDN or

2

32

ns

IOCSN, whichever is first)

tRDREC Recovery Time Between Reads (from the trailing edge of RDN or 23

—

ns

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

IOCSN, whichever is last)

tRDRECRXD Recovery Time Between Consecutive RXDAT Reads (from the

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

trailing edge of RDN or IOCSN, whichever is first)

86

—

ns

tRDPW Minimum Pulse Width (from the leading edge of RDN or IOCSN,

23

—

ns

whichever is last, to the trailing edge of RDN or IOCSN, which-

ever is first)

IOCSN

tRDPW

RDN

A

D HIGH IMPEDANCE

tRDDV1

tRDASU

VALID

tRDDV2

VALID

tRDRECRXD

tRDREC

tRDAHD

tRDDZ

Figure 6. Register Access Timing—SFR Read

VALID

VALID

5-5352

10

Agere Systems Inc.

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