Motorola DSP56301 - Manual (Page 141)

HI32 DSP-Side Programming Model
Host Interface (HI32) 6 -23
6.7.1 DSP Control Register (DCTR)
The DCTR is a 24-bit read/write control register by which the core controls the HI32
interrupts, flags, and host port pin functionality. The host processor cannot access the DCTR.
To access individual DCTR bits, use the bit manipulation instructions.
.
23 22 21 20 19 18 17 16
HM2 HM1 HM0 HIRD HIRH HRSP HDRP
All modes All modes All modes UB UB UB UB
15 14 13 12 11 10 9 8
HTAP HRWP HDSM
UB UB UB
7 6 5 4 3 2 1 0
HINT HF5 HF4 HF3 SRIE STIE HCIE
UB/PCI UB/PCI UB/PCI UB/PCI UB/PCI UB/PCI UB/PCI
Reserved. Write to 0 for future compatibility
UB = Universal Bus mode PCI = PCI mode
Figure 6-5. DSP Control Register (DCTR)
Table 6-10. DSP Control Register (DCTR) Bit Definitions
Bit Number Bit Name
Reset
Value
Mode Description
23 0 Reserved. Write to 0 for future compatibility.
22–20 HM[2–0] 0 All
modes
HI32 Mode
Control the operation modes and pin functionality of the HI32. Values
are as follows:
000 Terminate and Reset
001 PCI
010 Universal Bus
011 Enhanced Universal Bus
100 GPIO
101 Self Configuration
110 Reserved
111 Reserved