TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
SPRS439M –JUNE 2007–REVISED AUGUST 2012
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4.14 External Interface (XINTF)
This section gives a top-level view of the external interface (XINTF) that is implemented on the
2833x/2823x devices.
The XINTF is a non-multiplexed asynchronous bus, similar to the 2812 XINTF. The XINTF is mapped into
three fixed zones shown in Figure 4-20 .
Data Space
Prog Space
0x0000-0000
XD[31:0]
XA[19:0]
XZCS0
0x0000-4000
0x0000-5000
XINTF Zone 0
(8K x 16)
0x0010-0000
0x0020-0000
0x0030-0000
XINTF Zone 6
(1M x 16)
XZCS6
XINTF Zone 7
(1M x 16)
XZCS7
XA0/XWE1
XWE0
XRD
XR/W
XREADY
XHOLD
XHOLDA
XCLKOUT
A. Each zone can be programmed with different wait states, setup and hold timings, and is supported by zone chip
selects that toggle when an access to a particular zone is performed. These features enable glueless connection to
many external memories and peripherals.
B. Zones 1 – 5 are reserved for future expansion.
C. Zones 0, 6, and 7 are always enabled.
Figure 4-20. External Interface Block Diagram
Figure 4-21 and Figure 4-22 show typical 16-bit and 32-bit data bus XINTF connections, illustrating how
the functionality of the XA0 and XWE1 signals change, depending on the configuration. Table 4-19 defines
XINTF configuration and control registers.
106
Peripherals
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