TC1796
Peripheral Units (Vol. 2 of 2)
General Purpose Timer Array (GPTA)
User’s Manual 24-106 V2.0, 2007-07
GPTA, V2.0
The LTC input multiplexer contains LTC input Multiplexer Groups (LIMGs) that connect
the I/O groups or Global Timer Cells with the input lines of the LTCs, organized into eight
LTC groups with 8 cells each. IOGs and GTCs are grouped into seven IOGs (IOG[6:0])
with eight lines each and four GTC groups (GTCG[3:0]) with 8 cells each. Two special
groups are available: a clock group with eight lines representing the clock bus lines
CLK[7:0] of the clock distribution unit and a PDL/INT group with eight outputs that
combines the four PDL outputs and four internal input lines INT[3:0] as a group of LIMGs
inputs.
Figure 24-69 shows the logical structure of a LIMG.
Figure 24-69 LTC Input Multiplexer Group (LIMG) Structure
Rules for connections to LTC Input Multiplexer Group LIMG:
• Within an I/O group or GTC group, the line or the output of the cell with the lowest
index number is connected to LIMG input line IN0. The remaining lines, cells or lines
of a group are connected to LIMG input lines IN1 to IN7 with ascending index
numbers. At the clock group, CLK0 is connected to IN0 and the remaining clock lines
are connected to LIMG input lines IN1 to IN7 with ascending index numbers. At the
PDL/INT group, PDL[3:0] (see Page 24-20) is connected to IN[3:0] and INT[3:0] is
connected to IN[7:4].
Example: for LIMG23 (see Figure 24-68), the cells GTC24 up to GTC31 are wired to
the LIMG23 input lines IN0 to line IN7.
• Multiplexer output OUT0 is always connected to the input of an LTC group with the
lowest index. The remaining output lines OUT1 to OUT7 are connected to the LTC
inputs with ascending index.
MCA05978
From other LIMGs
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
Outputs of an
I/O Group or
GTC Group or
CLK Group
PDL/INT Group
To other
LIMGs
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
To LTC Groups
More than one switch
might be closed per row,
only one switch can be
closed per column
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