Bus Interface Unit (BIU) Registers
4.6.3
Address Attribute Registers (AAR[0–3])
The Address Attribute Registers (AAR[0–3]) are read/write registers that control the activity of
the AA0 / RAS0 – AA3 / RAS3 pins. The associated AAn / RASn pin is asserted if the address defined by
the BAC bits in the associated AAR matches the exact number of external address bits defined by
the BNC bits, and the external address space (X data, Y data, or program) is enabled by the AAR.
Figure 4-8 shows an AAR register; Table 4-10 lists the bit definitions.
Note:
The DSP56311 does not support address multiplexing.
23
BAC11
11
BNC3
22
BAC10
10
BNC2
21
BAC9
9
BNC1
20
BAC8
8
BNC0
19
BAC7
7
BPAC
18
BAC6
6
17
BAC5
5
BYEN
16
BAC4
4
BXEN
15
BAC3
3
BPEN
14
BAC2
2
BAAP
13
BAC1
1
BAT1
12
BAC0
0
BAT0
Reserved bit. Read as zero; write to zero for future compatibility
Figure 4-8. Address Attribute Registers (AAR[0–3]) (X:$FFFFF9–$FFFFF6)
Table 4-10. Address Attribute Registers (AAR[0–3]) Bit Definitions
Bit
Number
23–12
Bit Name
BAC[11–0]
Reset
Value
0
Bus Address to Compare
Description
Read/write control bits that define the upper 12 bits of the 24-bit address with which to
compare the external address to determine whether to assert the corresponding AA/RAS
signal. This is also true of 16-bit compatibility mode. The BNC[3–0] bits define the number of
address bits to compare.
11–8
BNC[3–0]
0
Bus Number of Address Bits to Compare
Specify the number of bits (from the BAC bits) that are compared to the external address.
The BAC bits are always compared with the Most Significant Portion of the external address
(for example, if BNC[3–0] = 0011, then the BAC[11–9] bits are compared to the 3 MSBs of
the external address). If no bits are specified (that is, BNC[3–0] = 0000), the AA signal is
activated for the entire 16 M-word space identified by the space enable bits (BPEN, BXEN,
BYEN), but only when the address is external to the internal memory map. The
combinations BNC[3–0] = 1111, 1110, 1101 are reserved.
DSP56311 User’s Manual, Rev. 2
Freescale Semiconductor
4-25
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