VSC7440 datasheet(258/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

241

Figure 76 •

TTI Calendar Example

In the example, it takes (256/2) × (1 + 2) × 4 = 1536 clock cycles to service all TTIs in the blue section.

With a clock cycle of 4 ns, the TTIs in the blue section must not use ticks faster than 1536 × 4 = 6144 ns.

Similarly, the 768 TTIs in the red section must not use ticks faster than

(768/1) × (1 + 2) × 4 × 4 ns = ~36.9 µs

3.25.4.2 Other TTI Parameters

Other TTI-related parameters are listed in the following table.

3.25.4.3 TTI Table Update Engine (AFI TUPE)

The AFI Table Update Engine (AFI TUPE) can be used to quickly update a large number of entries in the

TTI Table such as disabling or enabling timers in fail-over scenarios. AFI TUPE related parameters are

listed in the following table. The parameters prefixed with CRIT are used to specify the criteria, which

TTIs fulfill in order for TUPE to apply.

Table 167 •

Miscellaneous TTI Registers Overview

Field

Description

Replication

TTI_CTRL

TTI_ENA

Enables TTI.

Before enabling TTI, TTI_INIT should be used to initialize calendar state.

TTI_INJ_CNT TTI_INJ_CNT Number of TTI injections.

Enabled per TTI using TTI_TBL:TTI_MISC_CFG.INJ_CNT_ENA.

Table 168 •

AFI TUPE Registers Overview

AFI:TUPE

Field

Description

Replication

TUPE_MISC

TUPE_START

Start TUPE.

TUPE_MISC

CRIT_TUPE_CTRL_VAL_ENA Enable use of CRIT_TUPE_CTRL_VAL and

CRIT_TUPE_CTRL_MASK.

TUPE_MISC

CRIT_PORT_NUM_ENA

Enable use of CRIT_PORT_NUM_VAL.

start=0

end=255

cnt=2

start=256

end=1023

cnt=1

start

end

cnt

start

end

cnt

TTI Table

TTI

Calendar

TTI_CAL_LEN=2

Order of TTI Table entry checks:

0,1,256,2,3,257, .... 254,255,384,0,1,385,...

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