COBHAM GR740 User Manual

GR740-UM-DS, Nov 2017, Version 1.7 393 www.cobham.com/gaisler
GR740
Which instructions are traced is defined in the instruction trace buffer control register [31:28], as
defined in the table below:
The instruction trace buffer is enabled after reset when the DSU_EN signal is HIGH and the BREAK
signal is low.
33.5 DSU memory map
The DSU memory map can be seen in table 523 below. In a multiprocessor systems, the register map
is duplicated and address bits 27 - 24 are used to index the processor.
Table 522.Trace filter operation
Trace filter Instructions traced
0x0 All instructions
0x1 SPARC Format 2 instructions
0x2 Control-flow changes. All Call, branch and trap instructions including branch targets
0x4 SPARC Format 1 instructions (CALL)
0x8 SPARC Format 3 instructions except LOAD or STORE
0xC SPARC Format 3 LOAD or STORE instructions
0xD SPARC Format 3 LOAD or STORE instructions to alternate space
0xE SPARC Format 3 LOAD or STORE instructions to alternate space 0x80 - 0xFF
Load and stores to ASI 0x80 - 0xFF do not cause operations on the on-chip bus and can be used to
implement software trace points.
Table 523.DSU memory map
Address offset Register
0x000000 DSU control register
0x000008 Time tag counter
0x000020 Break and Single Step register
0x000024 Debug Mode Mask register
0x000040 AHB trace buffer control register
0x000044 AHB trace buffer index register
0x000048 AHB trace buffer filter control register
0x00004c AHB trace buffer filter mask register
0x000050 AHB breakpoint address 1
0x000054 AHB mask register 1
0x000058 AHB breakpoint address 2
0x00005c AHB mask register 2
0x000070 Instruction count register
0x000080 AHB watchpoint control register
0x000090 - 0x00009C AHB watchpoint 1 data registers
0x0000A0 - 0x0000AC AHB watchpoint 1 mask registers
0x0000B0 - 0x0000BC AHB watchpoint 2 data registers
0x0000C0 - 0x0000CC AHB watchpoint 2 mask registers
0x100000 - 0x10FFFF Instruction trace buffer (..0: Trace bits 127 - 96, ..4: Trace bits 95 - 64,
..8: Trace bits 63 - 32, ..C : Trace bits 31 - 0)
0x110000 Instruction Trace buffer control register 0
0x110004 Instruction Trace buffer control register 1
0x200000 - 0x210000 AHB trace buffer (..0: Trace bits 127 - 96, ..4: Trace bits 95 - 64,
..8: Trace bits 63 - 32, ..C : Trace bits 31 - 0)

COBHAM GR740 Specifications

General

Brand	COBHAM
Model	GR740
Category	Computer Hardware
Language	English