AN-573 Datasheet, PDF (8/12 Pages) Holt Integrated Circuits – Software Porting Guide Mamba Family Remote Terminal Applications

AN‐573
Register Settings
In general, to configure a remote terminal only requires initializing a handful of registers. The registers
themselves and the some of the bit locations are slightly different between HI‐6120/21 and Mamba
Family, but identifying the needed configuration bits is straightforward.
Table 3 ‐ RT Initialization Register Comparison
Holt HI‐6120/21
Configuration Register 1 (0x0000)
Configuration Register 2 (0x0001)
Interrupt Enable Register (0x0010)
Operation Status Register (0x0002)
Descriptor Table Base Address
Register (0x0005)
Holt Mamba HI‐6135/6/7/8
Master Configuration Register (0x0000)
RT Configuration Register (0x0017)
Hardware Interrupt Enable Register
(0x000F)
Hardware Interrupt Output Enable
Register (0x0013)
RT Interrupt Enable Register (0x0012)
RT Output Enable Register (0x0016)
RT Operation Status Register (0x0018)
Time Tag Counter Configuration
Register (0x0039)
RT Descriptor Table Base Address
Register (0x0017)
Comparison
See bit descriptions in Datasheet
See bit descriptions in Datasheet
Optional: See section on Interrupts
Optional: See section on Interrupts
See section on Interrupts
See section on Interrupts
Optional
For the HI‐6120/21 these bits are in
Configuration Register 1
Optional
Reset and Initialization
Reset Behavior
For both HI‐6120/21 and Mamba family a hardware reset is initiated by asserting the MR Master Reset
pin for at least 200ns. The software reset behavior is slightly different. For the HI‐6120/21 a software
reset is initiated by setting the SRST bit (10) in Configuration Register 1 (0x0000). Software reset has
minimal effect on previously initialized registers and RAM structures that define terminal behavior. For
the Mamba family, RT software reset is initiated by setting the RTRESET bit (10) in the Master Status and
Reset Register (0x0001).
Table 4 ‐ Mamba Family RT Soft Reset Summary
Action
Clears these individual register bits
Clears these entire register
addresses
Register Affected
0x0000 Master Configuration Register, RTSTEX bit 4
0x0006 Hardware Pending Int Register, RTIP bit 2
0x0006 Hardware Pending Int Register, RTAPF bit 3
0x0009 RT Pending Int Register, RT int bits 8 – 3
0x0018 RT Operational Status Register
0x001A RT MIL‐STD‐1553 Status Word Bits Register
0x001E RT Built‐In Test Word Register
0x0049 RT Time Tag Counter
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