ADSP-214xx SHARC Processor Hardware Reference 3-15
External Port
Operating Modes
The AMI operating modes are described in the following sections.
Data Packing
The combination of the (
PKDIS) and (MSWF) bits allow combinations of
packing for 8/16 to 32 bits. These modes are summarized in Table 3-4.
External Access Extension
The AMI controller has an ACK Pin which can be used for external access
extension. When ACK is enabled, the wait state value should be set to indi-
cate when the processor can sample
ACK after the AMI_RD/AMI_WR edge goes
low (refer to Figure 3-3 and Figure 3-4). If
ACK is not enabled, the mini-
mum value for
WS is 2 (a wait state value of 0 corresponds to 32 wait
cycles). If ACK is enabled, the minimum allowed value for WS is 1.
Table 3-3. AMI Address Memory Map
Bus Width External
Memory
Bank
Internal Logical Address
(supported memory map)
External Physical Address
(on ADDR23–0)
ADSP-2146x/ADSP-2147x/ADSP-2148x
8-bit (and
PKDIS = 0)
0 0x0020_0000 – 0x003F_FFFF 0x80_0000 – 0xFF_FFFF
8-bit (and
PKDIS = 0)
1, 2, 3 0x0400_0000 – 0x043F_FFFF
0x0800_0000 – 0x083F_FFFF
0x0C00_0000 – 0x0C3F_FFFF
0x00_0000 – 0xFF_FFFF
ADSP-2147x/ADSP-2148x
16-bit (and
PKDIS = 0)
0 0x40_0000 – 0xFF_FFFF
16-bit (and
PKDIS = 0)
1, 2, 3 0x0400_0000 – 0x047F_FFFF
0x0800_0000 – 0x087F_FFFF
0x0C00_0000 – 0x0C7F_FFFF
0x00_0000 – 0xFF_FFFF
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