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Programming
Table 4-2. DRAM Address as Viewed from the VMEbus (Continued)
RBA4 RBA3 RBA2 RBA1 RBA0
1
0
1
0
4
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
Notes 1. DRAMsize = the size of the DRAM. For example, if the 4MB
version is used, then DRAMsize = $400000, and (3 x DRAMsize)-
1 = $BFFFFF.
2. When beginning address is less then 16MB, the DRAM
responds to standard or extended address modifiers. When
beginning address is 16MB or greater, the DRAM responds to
extended address modifiers only. Note that bits 4 and 5 in the
VMEchip Slave Address Modifier Register further control
response to standard and extended address modifiers.
3. This combination pertains only to DRAMsize of 16MB or 32MB.
4. The values shown in the table refer to extended addresses only.
In the standard address range the DRAM responds to $000000
through $7FFFFF.
4-28
0
0
0
16 x DRAMsize (17 x DRAMsize)-1
0
0
1
17 x DRAMsize (18 x DRAMsize)-1
0
1
0
18 x DRAMsize (19 x DRAMsize)-1
0
1
1
19 x DRAMsize (20 x DRAMsize)-1
1
0
0
20 x DRAMsize (21 x DRAMsize)-1
1
0
1
21 x DRAMsize (22 x DRAMsize)-1
1
1
0
22 x DRAMsize (23 x DRAMsize)-1
1
1
1
23 x DRAMsize (24 x DRAMsize)-1
0
0
0
24 x DRAMsize (25 x DRAMsize)-1
0
0
1
25 x DRAMsize (26 x DRAMsize)-1
0
1
0
26 x DRAMsize (27 x DRAMsize)-1
0
1
1
27 x DRAMsize (28 x DRAMsize)-1
1
0
0
1
0
1
Beginning
Ending
Address
Address
$00000000
(1 x DRAMsize)-1
1 x DRAMsize (2 x DRAMsize)-1
Notes
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 3, 4
1, 3, 4
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