XVME-956 Manual
August 1994
NAME
SIZE
BYTES
MFGR.
*
PINS
JUMPERING
W1, 6
W2, 7
W3, 8
W4, 9
28C256
32K
Atmel
28
1/2
5/6, 8/9
Open
3/5, 4/6
29C256
32K
Atmel
28
1/2
5/8, 6/9
Open
3/5, 4/6
28F256
32K
Intel
32
1/2
2/3, 4/5, 6/9
Open
4/6
28F512
64K
Intel
32
1/2
2/3, 4/5, 6/9, 7/8
Open
4/6
28F010
128K
AMD
32
1/2
2/3, 4/5, 6/9, 7/8
Open
4/6
28F020
256K
Intel
32
1/2
2/3, 4/5, 6/9, 7/8
Open
1/3, 4/6
* o r equivalent
5.4.3.1 R e s t r i c t i o n s on EPROM Use
NEC EPROMs 27C1001, and 27C1002 cannot coexist on the same module with battery backed RAM.
These EPROMs draw significant current ( > l m A ) through their Chip Select inputs and may cause
failure of the back-up battery. Signetics 27C256 may draw up to 10 uA through its Chip Select inputs
when not powered. Though substantially less than the NEC part, it is still much greater than the usage
(typically < 1 uA) by other devices. Use of such devices may limit battery life. I t is your
responsibility to determine the proper devices for your application.
5.4.3.2 F l a s h EPROM Jumpering
To install Flash EPROMs, jumper the byte-wide sockets according to the contents of Table 5-10, then
plug in the devices.
Table 5-10. Flash EPROM Jumpering
•
5-11
