SPMC68CK338CPV14 datasheet(83/133 Pages) FREESCALE

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MC68CK338

MOTOROLA

MC68CK338TS/D

Figure 18 Time Base Bus Configuration

As shown in Figure 18, each CTM submodule can access one of two global time base buses. TBB1

and TBB4 are collectively referred to as global time base bus TBBA. Likewise, TBB2 and TBB3 are col-

lectively referred to as global time base bus TBBB. Table 46 shows which time base buses are available

for each CTM6 submodule.

Time base buses are used to transfer timing information from counters to action submodules. Each

CTM6 submodule can either be a clock source module (and drive one or two of the time base buses)

or an action submodule (and read and react to the timing information on the time base buses).

Table 46 CTM6 Time Base Bus Allocation

Global/Local Time Base

Bus Allocation

Global/Local Time Base

Bus Allocation

Submodule

Global Bus A

Global Bus B

Submodule

Global Bus A

Global Bus B

MCSM2

TBB4

TBB3

SASM18

TBB1

TBB2

FCSM3

TBB4

TBB3

SASM24

TBB1

TBB2

DASM4 – 10

TBB4

TBB3

DASM26 – 29

TBB1

TBB2

SASM12 – 14

TBB4

TBB3

MCSM30 – 31

TBB1

TBB2

SUBMODULE M

BUS INTERFACE UNIT SUBMODULE (BIUSM)

INTERMODULE BUS (IMB)

TIME BASE BUS A (TBBA)

SUBMODULE N

SUBMODULE M+1

SUBMODULE M-1

SUBMODULE 1

SUBMODULE 2

TIME BASE BUS B (TBBB)

CTM TBB BLOCK

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