IMS C011

/30

6

Symbol

Parameter

Min

Nom

Max

Units

Notes

TDCLDCH

ClockIn pulse width low

40

ns

1

TDCHDCL

ClockIn pulse width high

40

ns

1

TDCLDCL

ClockIn period

200

ns

1,2,4

TDCerror

ClockIn timing error

0.5

ns

1,3

TDC1DC2

Difference in ClockIn for 2 linked devices

400

ppm

1,4

TDCr

ClockIn rise time

10

ns

1,5

TDCf

ClockIn fall time

8

ns

1,5

Notes

1 Guaranteed, but not tested.

2 Measured between corresponding points on consecutive falling edges.

3 Variation of individual falling edges from their nominal times.

4 This value allows the use of 200ppm crystal oscillators for two devices connected together by

a link.

5 Clock transitions must be monotonic within the range VIH to VIL (table 7.3).

Table 3.1

Input clock

90%

10%

TDCr

2.0V

0.8V

1.5V

TDCerror

TDCerror

TDCerror

TDCerror

TDCLDCH

TDCHDCL

TDCLDCL

TDCf

90%

10%

Figure 3.2

ClockIn timing

3.4

SeparateIQ

The IMS C011 link adaptor has two different modes of operation. Mode 1 is basically a link to peripheral

adaptor, whilst Mode 2 interfaces between a link and a microprocessor bus system.

Mode 1 can be selected for one of two link speeds by connecting SeparateIQ to VDD (10 Mbits/sec) or

to ClockIn (20 Mbits/sec).

Mode 2 is selected by connecting SeparateIQ to GND; in this mode 10 Mbits/sec or 20 Mbits/sec is se-

lected by LinkSpeed. Link speeds are specified for a ClockIn frequency of 5 MHz.

In order to select the link speed, SeparateIQ may be changed dynamically providing the link is in a quies-

cent state and no input or output is required. Reset must be applied subsequent to the selection to initialise