KL5KUSB121 Просмотр технического описания (PDF) - KAWASAKI MICROELECTRONICS

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производитель

KL5KUSB121

USB to 10/100 Ethernet Controller

KAWASAKI MICROELECTRONICS 

PRELIMINARY

KL5KUSB121

4.2 SRAM Write Access

USB to 10/100 Ethernet Controller

Figure 4.2.1 SRAM Write AC Timing

SRAMA14-0

(OUT)

Twc

valid

Tdaw

SRAMOEN

(OUT)

SRAMCSN

(OUT)

SRAMWEN

(OUT)

Tdrv

SRAMD7-0

(OUT)

Tdcw

Tpwe

Tval

valid

Tdwa

Tdwc

Tts

Table 4.2.1 SRAM Write AC Characteristics (over recommended range)

Symbol

Parameter

Min Typ Max Unit Not

e

Twc

SRAM write cycle

31.25 –

– ns 1,2

Fwc

SRAM write frequency –

–

32 MH 1,2

z

Tdaw SRAMWEN assert

delay

0

–

– ns 2

from SRAMA valid

Tdwa SRAMA invalid delay

from SRAMWEN

0

–

– ns 2

negate

Tdcw SRAMWEN assert

delay

0

–

– ns 2

from SRAMCSN assert

Tdwc SRAMCSN negate

delay

0

–

– ns 2

from SRAMWEN

negate

Tpwe SRAMWEN low width 25

–

– ns 2

Tdrv

SRAMD drive delay

from SRAMWEN

0

–

– ns 2

assert

Tval

SRAMD valid

from SRAMWEN

–

–

15 ns 2

assert

Tts

SRAMD hold time

from SRAMWEN rise

0

–

– ns 2

Note: 1) Same as the USB to Ethernet internal clock cycle time 1T (31.25 ns).

2) Outputs are assumed to have 30pF external capacitive load.

Ver. 1.1

Kawasaki LSI • 2570 North First Street • Suite 301 • San Jose, CA 95131 • Tel: (408) 570-0555 • Fax: (408) 570-0567 • www.klsi.com

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