STV0684 datasheet(38/49 Pages) STMICROELECTRONICS

38 / 49 page

Electrical Characteristics

STV0684

38/49

4.5.9.1

Compact flash pin description

The following table lists the pins of the CF card which are connected to the STV0684.Output refers

to pins that are driven by STV0684. Input is those pins that are driven by the CF Card.

4.5.9.2

Compact flash timings

The timings achieved for accessing the attribute and common memory are listed below.There are

registers in the CF Controller of the STV0684 in which all these timings can be programmed in

terms of number of clocks of 48MHz. All the timings below assume a 48MHz operating clock

frequency.

Table 13: Pin description

Symbol

Pin Description

Direction

SFP used

CFA0 ~CFA10

Address

Output

52~62

CARD_DET

CARD_DET2

Card Detect

Input

CS CARD EN

Card Enable.

Output

IO0~IO7

Data. Only 8 bits of the data bus D[7:0] are used.

Input

35~42

ALE OE

Output Enable

Output

CLE RDY

Ready/Busy

Input

RE REG

Output

RST

Reset

note 1

1. The reset may come from the global reset of the system or be driven by a user definable SFP this

function is application specific.

RB WAIT

Wait

Input

Write Enable

Output

Table 14: CF attribute memory read timing

Symbol

Parameter

Min.

Typ.

Max.

Units

tc(R)

Read Cycle Time

340

ta(A)

Address Access Time

300

ta(CE)

Card Enable Access Time

300

ta(OE)

Output Enable Access Time

300

tdis(CE)

Output Disable Time from CE

100

tdis(OE)

Output Disable Time from OE

100

tsu (A)

Address Setup Time

ten(CE)

Output Enable Time from CE

ten(OE)

Output Enable Time from OE

tv(A)

Data Valid from Address Change

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