SA828 datasheet(4/14 Pages) MITEL

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SA828

Fig. 3 Asynchronous PWM generation with‘double-edged’ regular sampling as used by the SA828

ALE

t10

t11

t12

AD0-AD7

LATCH ADDRESS

LATCH DATA

t15

t10

t11

t12

R/W

AD0-AD7

LATCH ADDRESS

LATCH DATA

t15

– 1

RESULTING

PWM

WAVEFORM

PWM SWITCHING

INSTANTS

TRIANGLE WAVE AT

CARRIER FREQUENCY,

SAMPLING ON +VE AND – VE PEAKS

POWER WAVEFORM

AS READ FROM

INTERNAL ROM

Fig. 5 Motorola bus timing definitions

Parameter

AS high period

Delay time, as low to DS high

DS high period

Delay time, DS low to AS high

DS low period

DS high to R/W low setup time

R/W hold time

CS setup time

CS hold time

Address setup time

Address hold time

Write data setup time

Write data hold time

Symbol

t10

t15

t11

t12

Min.

210

200

110

Table 2 Motorola bus timings at VDD = 5V, TAMB = +25°C

Units

Fig. 4 Intel bus timing definitions

Parameter

ALE high period

Delay time, ALE to WR

WR low period

Delay time, WR high to ALE high

CS setup time

CS hold time

Address setup time

Address hold time

Data setup time

Data hold time

Symbol

t10

t15

t11

t12

Min.

200

100

Table 1 Intel bus timings at VDD = 5V, TAMB = +25°C

Units

SA828 数据表(PDF) 4 Page - Mitel Networks Corporation

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