LCSR Programming Model

VMEbus Slave Address Modifier Select Register 2

ADR/SIZ

 

 

$FFF40010 (8 bits of 32)

 

 

 

 

 

 

 

 

 

 

 

BIT

23

22

21

20

19

18

17

16

 

 

 

 

 

 

 

 

 

NAME

SUP

USR

A32

A24

D64

BLK

PGM

DAT

 

 

 

 

 

 

 

 

 

OPER

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

 

 

 

 

 

 

 

 

 

RESET

0 PSL

0 PSL

0 PSL

0 PSL

0 PSL

0 PSL

0 PSL

0 PSL

 

 

 

 

 

 

 

 

 

This register is the address modifier select register for the second VMEbus to local bus map decoder. There are three groups of address modifier select bits: DAT, PGM, BLK and D64; A24 and A32; and USR and SUP. At least one bit must be set from each group to enable the map decoder.

DAT

When this bit is high, the second map decoder responds to

 

VMEbus data access cycles. When this bit is low, the

 

second map decoder does not respond to VMEbus data

 

access cycles.

PGM

When this bit is high, the second map decoder responds to

 

VMEbus program access cycles. When this bit is low, the

 

second map decoder does not respond to VMEbus

 

program access cycles.

BLK

When this bit is high, the second map decoder responds to

 

VMEbus block access cycles. When this bit is low, the

 

second map decoder does not respond to VMEbus block

 

access cycles.

D64

When this bit is high, the second map decoder responds to

 

VMEbus D64 block access cycles. When this bit is low,

 

the second map decoder does not respond to VMEbus

 

D64 block access cycles.

A24

When this bit is high, the second map decoder responds to

 

VMEbus A24 (standard) access cycles. When this bit is

 

low, the second map decoder does not respond to

 

VMEbus A24 access cycles.

2

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Motorola MVME172 manual VMEbus Slave Address Modifier Select Register, Dat, Pgm, Blk