10 clock source configurations – ADLINK PCI-8554 User Manual

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Getting Started •19

2.10 Clock Source Configurations

For each independent counter, one of four different clock sources maybe
selected using the software. The clock source of counter n can be either
an external clock source (ECLK n), a cascaded counter output (COUTn-1),
CK1 or COUT10.

Note:
1. The clock source of cascaded counter 11 is set at C8M (8MHz) and

counter 12 is set to COUT11.

2. The external clock source labelled ECK n comes from JP1 ~ JP10,

see section 2.12 for details

ECK n

CLK n

COUT10

COUT n-1
CK1

select by function

"_8554_SET_cntCLK"

n=1~9

ECK10

CLK10

C8M

COUT9
CK1

select by function

"_8554_SET_cntCLK"

Figure 12: Clock Source of Counter n

C8M

CK1

COUT11

select by function

"_8554_SET_CK1"

Figure 13: Clock Source of CK1