5962F9211803QXC View Datasheet(PDF) - Aeroflex UTMC
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5962F9211803QXC Datasheet PDF : 177 Pages
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3.2.4 Status Words
The next two locations in the SBC Command Block are for
status words. As the RT responds to the BC’s command, the
corresponding status word will be stored in Status Word 1. In a
RT-RT transfer, the first status word will be the status of the
Transmitting RT while the second status word will be the status
of the Receiving RT.
3.2.5 Branch Address
The seventh location in the SBC Command Block contains the
starting location of the branch. This location simply allows the
SBC to branch to another location in memory when certain
opcodes are used.
3.2.6 Timer Value
The last location in the SBC Command Block is the Timer Value.
This timer is used for one of two purposes. First, the value may
be used to set up minor frame schedules when using the Load
Minor Frame Timer opcode (1110). The MFT counter may be
driven by the TCLK input. If not driven by the TCLK input, the
MFT counter is clocked at a period of 64 s by an internal clock.
The MFT counter runs continuously during message processing
and must decrement to zero prior to loading the next Minor
Frame time value. Second, the value may be used as a message-
to-message timer (MMT) when using the Skip opcode (0001).
The MMT timer is clocked at the 24MHz rate and allows for
scheduling of specific time between message execution.
3.3 Command Block Chaining
The host determines the first Command Block by setting the
initial start address in the Command Block Pointer Register
(Reg 8). The Command Blocks will execute in a contiguous
fashion as long as no “go to”, “branch”, “call”, or “return”
opcodes are used. With the use of these opcodes, almost any
memory configuration is possible. Figures 9a, 9b and 10 show
how several Command Blocks may be linked together to form
a command frame and how branch opcodes may be used to link
minor frames. The minimum BC intermessage gap is 28.0 s.
46
S MMIT FAMILY
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