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EMBEDDED Intel486™ PROCESSOR HARDWARE REFERENCE MANUAL
Table 7-10. 32-Bit to 32-Bit Bus Swapping Logic Truth Table
Intel486™ Processor
BE3# BE2# BE1# BE0#
0
0
0
1
0
0
0
1
0
1
1
0
0
0
1
1
0
1
0
1
1
1
1
1
0
0
0
1
0
0
0
1
0
1
1
0
0
0
1
1
0
1
0
1
1
1
1
1
Inputs
NOTES:
1. X implies "do not care" (either 0 or 1).
2. BHE# (byte high enable) is not needed in 8-bit interface.
†
3.
indicates a non-occurring pattern of byte enables; either none are asserted or the pattern has byte
enables asserted for non-contiguous bytes.
7-16
(3)
BEN16#
BEN8UH#
0
1
1
0
1
1
†
0
1
1
0
1
1
†
0
1
1
†
0
1
1
†
0
1
1
0
1
1
1
1
1
1
1
1
†
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
†
1
1
1
(1)
8-Bit Interface
BEN8UL#
BEN8H#
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Outputs
(2)
BHE#
A1
A0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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