MT8920B-1 查看數據表（PDF） - Mitel Networks

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MT8920B-1

ISO-CMOS ST-BUS™ FAMILY ST-BUS Parallel Access Circuit

Mitel Networks 

CMOS MT8920B

CHANNEL N - BIT 0

CHANNEL (N + 1) - BIT 7

ST-BUS ACCESS

CONTENTION WINDOW

C4i

A0 - A5

READ ADDRESS N or WRITE ADDRESS (N + 1)

(N matches incoming

ST-BUS channel)

CS

CONDITION 1: Access begins before contention window and finishes before ST-BUS access - No contention.

OE, R/W

BUSY

tEC4H

CONDITION 2:

OE, R/W

BUSY

Access begins before contention window and continues into ST-BUS access.

tEC4L

tC4BL

tC4BH

CONDITION 3:

Access begins within contention window but before ST-BUS access.

OE, R/W

BUSY

tEC4L

tEBL

tC4BH

CONDITION 4: Access begins during ST-BUS access

OE, R/W

tEBL

BUSY

tC4BH

Figure 16 - Mode 2 Access Contention Resolution

3-21

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