2

VMEchip2

Local Bus Slave (VMEbus Master) Attribute Register 1

ADR/SIZ

 

 

 

 

$FFF40028 (8 bits of 32)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BIT

7

6

 

5

 

4

3

 

2

1

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

NAME

D16

WP

 

 

 

 

AM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPER

R/W

R/W

 

 

 

 

R/W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESET

0 PS

0 PS

 

 

 

 

O PS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This register is the attribute register for the first local bus to VMEbus bus

 

map decoder.

 

 

 

 

 

 

 

 

 

 

 

AM

 

These bits define the VMEbus address modifier codes the

 

 

 

VMEbus master uses for the segment defined by map

 

 

 

decoder 1. Because the local bus to VMEbus interface

 

 

 

does not support block transfers, the block transfer

 

 

 

 

address modifier codes should not be used.

 

 

WP

 

When this bit is high, write posting is enabled to the

 

 

 

 

segment defined by map decoder 1. When this bit is low,

 

 

 

write posting is disabled to the segment defined by map

 

 

 

decoder 1.

 

 

 

 

 

 

 

D16

 

When this bit is high, D16 data transfers are performed to

 

 

 

the segment defined by map decoder 1. When this bit is

 

 

 

low, D32 data transfers are per- formed to the segment

 

 

 

defined by map decoder 1.

 

 

 

 

2-46

Computer Group Literature Center Web Site

Page 124
Image 124
Motorola MVME172 Decoder 1. Because the local bus to VMEbus interface, Segment defined by map decoder 1. When this bit is