Address Translation Example (Single Mapped Region) - Texas Instruments SPRU938B User Manual

Peripheral Architecture
DM643x VLYNQ Module:
4C00 : 0054h
0000 : 0054h
subtract 0000 : 0000h
0000 : 0054h
Remote VLYNQ Module:
0000 : 0054h
compare 0000 : 0100h
0000 : 0054h
add 0800 : 0000h
0800 : 0054h
The local address 4C00:0054h (or 0000 0054h) was translated to 0800:0054h on the remote VLYNQ
device in Table 3.
Table 3 shows the address map register configuration when the DM643x device is receiving data from the
remote device.
Table 3. Address Translation Example (Single Mapped Region)
Register
TX Address Map
RX Address Map Size 1
RX Address Map Offset 1
RX Address Map Size 2
RX Address Map Offset 2
Remote VLYNQ Module:
0400 : 0154h
subtract 0400 : 0000h
0000 : 0154h
DM643x VLYNQ Module:
0000 : 0154h
compare 0000 : 0100h
0000 : 0154h
compare 0000 : 0200h
add 8200 : 0000h
subtract 0000 : 0100h
8200 : 0054h
18 VLYNQ Port
Initial address at the slave configuration bus
Initial address [25:0] at the slave configuration bus interface
TX address map register (there is no need to change the reset value of the
DM643x device for this register)
Initial address from the RX serial interface
RX address map size 1 register
RX address map offset 1 register
Translated address to remote device
DM643x VLYNQ Module
Do not care
0000 : 0100h
0200 : 0000h
0000 : 0100h
8200 : 0000h
Initial address at the slave configuration bus for the remote device
TX address map register
Translated address to remote device via serial interface
Initial address from the RX serial interface
RX address map size 1 register
The RX packet address is greater than the value in the RX address map size 1
register
RX address map size 1 register + RX address map size 2
Since the RX packet address < the RX address map size 1 register +
RX address map size 2 register
RX address map offset 2 register
RX address map size 1 register
Translated address to DM643x device
Remote VLYNQ Module
0400 : 0000h
Do not care
Do not care
Do not care
Do not care
SPRU938B – September 2007
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