7 Host Interface Port
7 – 18
The following example shows the data that a host would write to the HIP
for a 1000-instruction boot:
Data Location
Page Length (124 decimal) HDR3
Upper Byte of Instruction at 999 HDR0
Lower Byte of Instruction at 999 HDR2
Middle Byte of Instruction at 999 HDR1
Upper Byte of Instruction at 998 HDR0
Lower Byte of Instruction at 998 HDR2
Middle Byte of Instruction at 998 HDR1
Upper Byte of Instruction at 997 HDR0
Lower Byte of Instruction at 997 HDR2
Middle Byte of Instruction at 997 HDR1
• •
• •
• •
Upper Byte of Instruction at 0 HDR0
Lower Byte of Instruction at 0 HDR2
Middle Byte of Instruction at 0 HDR1
A 16-bit host boots the ADSP-21xx at the same rate as an 8-bit host. Either
type of host must write the same data to the same the HDRs in the same
sequence (HDR0, HDR2, HDR1). If a 16-bit host writes 16-bit data, the
upper byte of the data must be 0x00. The following example, loading the
instruction 0xABCDEF, illustrates this:
8
-Bit Host 16-Bit Host
1st Write (to HDR0) 0xAB 0x00AB
2nd Write (to HDR2) 0xEF 0x00EF
3rd Write (to HDR1) 0xCD 0x00CD
To Next Page
Loading...
Need help?
General
