CTS9513API-2 datasheet(12/28 Pages) ETC

12 / 28 page

Celeritous Technical Services Corp

800.687.6510 / 806.793.0708

3308 34th St

FAX

806.793.0710

Lubbock, Texas 79410

http://www.celeritous.com

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

Rev E

Tuesday, September 25,

CTS9513-2

5 Chan 16 bit 20MHz Counter/Timer

Figure 9 - CTS9513 Counter Gating Input Logic Block Diagram

MODE V (FSK) ERROR

An error in implementing the special gate function

prevents the implementation of Mode V (FSK

Generator). The gate level is supposed to control

whether the counter is reloaded from the LOAD or

HOLD register to determine the output rate generator

frequency

and

allow

switching

between

two

frequencies to produce Frequency Shift Keying (FSK)

modulation.

When programmed for Mode V, the current device

Revision will reload only from the HOLD register

regardless of the state of the GATE input.

This appears to be a general problem with the

“special gate” function that controls reloading of the

counter from the Load or Hold register depending on

the state of the gate.

MODE J ERROR

The counters will not allow a count of 1 to be set in

the load and/or hold registers

COUNTER SAVE ERRORS

Due to the asynchronous nature of this part (and to

an extent the original AMD AM9513) we have seen

errors in the saved counter data when a counter save

command is issued. This occurs when the write

strobe rising edge for a save command occurs simul-

taneously with a counter clock edge and the counter

tries to save the current count while also trying to in-

crement or decrement the counter.

The only solid solution we have found for this proble

is for the bus clock to also be the master clock or to

be phased locked to it in order for the timing of bus

read/write cycles to be deterministic with respect to

the counter clock edges.

Figure 8 - CTS9513 Counter Internal Prescaler Block Diagram

4 BITS

CLK IN

FREQUENCY

BCD SCALING

BINARY SCALING

CLK IN

CLK / 16

CLK / 256

CLK / 4096

CLK / 65536

CLK / 10

CLK / 100

CLK / 1000

CLK / 10000

COUNTER

MODE

GATE INPUT MUX

AND POLARITY

SELECT

TC-1

GATE -1

GATE

GATE+1

GATE EN

EDGE AND

LEVEL GATE

CONTROL

COUNTER

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