INDUSTRIAL I/O PACK SERIES
AVME9675A
VMEx64 bus 6U CARRIER BOARD
Acromag, Inc. Tel: 248-295-0310
- 47 -
http://www.acromag.com
- 47 -
https://ww.acromag.com
6.6 VME64x bus COMPLIANCE
Specification
This device meets or exceeds all written VME specifications per revision C.1
dated October 1985, IEC 821-1987 and IEEE 1014-1987
Data Transfer Bus
A24/A16:D16/D08 (EO) DTB slave; supports Read-Modify-Write cycles.
VME64x bus Access Time
500nS Typical (all carrier board registers); measured from the falling edge of
DSx* to the falling edge of DTACK*. 500nS Typical (IP registers with one wait
states). See IP specifications for information on wait states. IP register
access time will increase by the number of wait states multiplied by 125nS
(the period of the 8 Mhz clock).
VME64x bus Address Modifier
Codes:
Short I/O Space
Base address is hardware jumper selectable. Occupies 1K byte. Responds
to both address modifiers 29H & 2DH in the VMEbus short I/O space for
carrier board registers and IP I/O and ID PROM spaces.
Base address is hardware jumper selectable. Occupies 1K byte. Responds to
both address modifiers 29H & 2DH in the VME64x bus short I/O space for
carrier board registers and IP I/O and ID spaces.
Standard Address Space
Responds to both address modifiers 39H & 3DH in the VMEbus standard
address space when such accesses to IP memory are enabled via
programmable registers on the carrier board. Base addresses and sizes of IP
memory are programmable from 1M to 8M bytes.
Interrupts
Creates I(1-7) programmable request levels (up to two requests sourced
from each IP). D16/D08(O) interrupter (interrupt vectors come from IP
modules). Carrier registers for control & status monitoring. Interrupt
release mechanism is Release On Register Access (RORA).
Interrupts.
Supports two interrupt requests per IP and interrupt acknowledge cycles,
D16/D08(O).